Adding cached operations DODB::CachedDataBase(V).
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83
spec/benchmark.cr
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83
spec/benchmark.cr
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require "benchmark"
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require "../src/dodb.cr"
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require "./test-data.cr"
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class DODBCached < DODB::CachedDataBase(Ship)
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def initialize(storage_ext = "", remove_previous_data = true)
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storage_dir = "test-storage#{storage_ext}"
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if remove_previous_data
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::FileUtils.rm_rf storage_dir
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end
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super storage_dir
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end
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end
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class DODBUnCached < DODB::DataBase(Ship)
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def initialize(storage_ext = "", remove_previous_data = true)
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storage_dir = "test-storage#{storage_ext}"
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if remove_previous_data
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::FileUtils.rm_rf storage_dir
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end
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super storage_dir
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end
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end
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cached = DODBCached.new
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uncached = DODBUnCached.new
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Benchmark.ips do |x|
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x.report("adding values with a cache") do
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Ship.all_ships.each do |ship|
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cached << ship
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end
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end
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x.report("adding values without cache") do
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Ship.all_ships.each do |ship|
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uncached << ship
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end
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end
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end
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cached = DODBCached.new
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uncached = DODBUnCached.new
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Ship.all_ships.each do |ship|
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cached << ship
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uncached << ship
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end
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Benchmark.ips do |x|
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x.report("to_a with a cache") do
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cached.to_a
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end
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x.report("to_a without cache") do
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uncached.to_a
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end
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end
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Benchmark.ips do |x|
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x.report("to_h with a cache") do
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cached.to_h
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end
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x.report("to_h without cache") do
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uncached.to_h
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end
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end
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Benchmark.ips do |x|
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x.report("[0] with a cache") do
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cached[0]
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end
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x.report("[0] without cache") do
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uncached[0]
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end
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end
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402
spec/cached.cr
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402
spec/cached.cr
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require "spec"
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require "file_utils"
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require "../src/dodb.cr"
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require "./test-data.cr"
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class DODB::SpecDataBase < DODB::CachedDataBase(Ship)
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def initialize(storage_ext = "", remove_previous_data = true)
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storage_dir = "test-storage#{storage_ext}"
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if remove_previous_data
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::FileUtils.rm_rf storage_dir
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end
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super storage_dir
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end
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end
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describe "DODB::DataBase::Cached" do
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describe "basics" do
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it "store and get data" do
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db = DODB::SpecDataBase.new
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Ship.all_ships.each do |ship|
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db << ship
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end
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db.to_a.sort.should eq(Ship.all_ships.sort)
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end
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it "rewrite already stored data" do
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db = DODB::SpecDataBase.new
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ship = Ship.all_ships[0]
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key = db << ship
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db[key] = Ship.new "broken"
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db[key] = ship
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db[key].should eq(ship)
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end
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it "properly remove data" do
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db = DODB::SpecDataBase.new
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Ship.all_ships.each do |ship|
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db << ship
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end
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Ship.all_ships.each do |ship|
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db.pop
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end
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Ship.all_ships.each_with_index do |ship, i|
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# FIXME: Should it raise a particular exception?
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expect_raises DODB::MissingEntry do
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db[i]
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end
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db[i]?.should be_nil
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end
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end
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it "preserves data on reopening" do
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db1 = DODB::SpecDataBase.new
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db1 << Ship.kisaragi
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db1.to_a.size.should eq(1)
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db2 = DODB::SpecDataBase.new remove_previous_data: false
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db2 << Ship.mutsuki
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# Only difference with DODB::DataBase: for now, concurrent DB cannot coexists.
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db2.to_a.size.should eq(2)
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end
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it "iterates in normal and reversed order" do
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db = DODB::SpecDataBase.new
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Ship.all_ships.each do |ship|
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db << ship
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end
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# The two #each test iteration.
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db.each_with_index do |item, index|
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item.should eq Ship.all_ships[index]
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end
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db.each_with_index(reversed: true) do |item, index|
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item.should eq Ship.all_ships[index]
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end
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# Actual reversal is tested here.
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db.to_a(reversed: true).should eq db.to_a.reverse
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end
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it "respects the provided offsets if any" do
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db = DODB::SpecDataBase.new
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Ship.all_ships.each do |ship|
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db << ship
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end
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db.to_a(start_offset: 0, end_offset: 0)[0]?.should eq Ship.mutsuki
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db.to_a(start_offset: 1, end_offset: 1)[0]?.should eq Ship.kisaragi
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db.to_a(start_offset: 2, end_offset: 2)[0]?.should eq Ship.yayoi
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db.to_a(start_offset: 0, end_offset: 2).should eq [
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Ship.mutsuki, Ship.kisaragi, Ship.yayoi
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]
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end
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end
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describe "indices" do
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it "do basic indexing" do
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db = DODB::SpecDataBase.new
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db_ships_by_name = db.new_index "name", &.name
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Ship.all_ships.each do |ship|
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db << ship
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end
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Ship.all_ships.each_with_index do |ship|
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db_ships_by_name.get?(ship.name).should eq(ship)
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end
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end
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it "raise on index overload" do
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db = DODB::SpecDataBase.new
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db_ships_by_name = db.new_index "name", &.name
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db << Ship.kisaragi
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# Should not be allowed to store an entry whose “name” field
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# already exists.
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expect_raises(DODB::IndexOverload) do
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db << Ship.kisaragi
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end
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end
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it "properly deindex" do
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db = DODB::SpecDataBase.new
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db_ships_by_name = db.new_index "name", &.name
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Ship.all_ships.each do |ship|
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db << ship
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end
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Ship.all_ships.each_with_index do |ship, i|
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db.delete i
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end
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Ship.all_ships.each do |ship|
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db_ships_by_name.get?(ship.name).should be_nil
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end
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end
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it "properly reindex" do
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db = DODB::SpecDataBase.new
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db_ships_by_name = db.new_index "name", &.name
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key = db << Ship.kisaragi
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# We give the old id to the new ship, to get it replaced in
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# the database.
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some_new_ship = Ship.all_ships[2].clone
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db[key] = some_new_ship
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db[key].should eq(some_new_ship)
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db_ships_by_name.get?(some_new_ship.name).should eq(some_new_ship)
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end
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it "properly updates" do
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db = DODB::SpecDataBase.new
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db_ships_by_name = db.new_index "name", &.name
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Ship.all_ships.each do |ship|
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db << ship
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end
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new_kisaragi = Ship.kisaragi.clone.tap do |s|
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s.name = "Kisaragi Kai" # Don’t think about it too much.
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end
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# We’re changing an indexed value on purpose.
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db_ships_by_name.update "Kisaragi", new_kisaragi
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db_ships_by_name.get?("Kisaragi").should be_nil
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db_ships_by_name.get?(new_kisaragi.name).should eq new_kisaragi
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end
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end
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describe "partitions" do
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it "do basic partitioning" do
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db = DODB::SpecDataBase.new
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db_ships_by_class = db.new_partition "class", &.klass
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Ship.all_ships.each do |ship|
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db << ship
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end
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Ship.all_ships.each do |ship|
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db_ships_by_class.get(ship.klass).should contain(ship)
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end
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# We extract the possible classes to do test on them.
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ship_classes = Ship.all_ships.map(&.klass).uniq
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ship_classes.each do |klass|
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partition = db_ships_by_class.get klass
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# A partition on “class” should contain entries that all
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# share the same value of “class”.
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partition.map(&.klass.==(klass)).reduce { |a, b|
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a && b
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}.should be_true
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end
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db_ships_by_class.get("does-not-exist").should eq [] of Ship
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end
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it "removes select elements from partitions" do
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db = DODB::SpecDataBase.new
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db_ships_by_class = db.new_partition "class", &.klass
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Ship.all_ships.each do |ship|
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db << ship
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end
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db_ships_by_class.delete "Mutsuki", &.name.==("Kisaragi")
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Ship.all_ships.map(&.klass).uniq.each do |klass|
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partition = db_ships_by_class.get klass
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partition.any?(&.name.==("Kisaragi")).should be_false
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end
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end
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end
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describe "tags" do
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it "do basic tagging" do
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db = DODB::SpecDataBase.new
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db_ships_by_tags = db.new_tags "tags", &.tags
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Ship.all_ships.each do |ship|
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db << ship
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end
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db_ships_by_tags.get("flagship").should eq([Ship.flagship])
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# All returned entries should have the requested tag.
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db_ships_by_tags.get("name ship")
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.map(&.tags.includes?("name ship"))
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.reduce { |a, e| a && e }
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.should be_true
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# There shouldn’t be one in our data about WWII Japanese warships…
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db_ships_by_tags.get("starship").should eq([] of Ship)
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end
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it "properly removes tags" do
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db = DODB::SpecDataBase.new
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db_ships_by_tags = db.new_tags "tags", &.tags
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Ship.all_ships.each do |ship|
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db << ship
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end
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# Removing the “flagship” tag, brace for impact.
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flagship, index = db_ships_by_tags.get_with_indices("flagship")[0]
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flagship.tags = [] of String
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db[index] = flagship
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# ship, index = db_ships_by_tags.update(tag: "flagship") do |ship, index|
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# ship.tags = [] of String
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# db[index] = ship
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# end
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db_ships_by_tags.get("flagship").should eq([] of Ship)
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end
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it "gets items that have multiple tags" do
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db = DODB::SpecDataBase.new
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db_ships_by_tags = db.new_tags "tags", &.tags
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Ship.all_ships.each do |ship|
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db << ship
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end
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results = db_ships_by_tags.get(["flagship", "name ship"])
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results.should eq([Ship.yamato])
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results = db_ships_by_tags.get(["name ship", "flagship"])
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results.should eq([Ship.yamato])
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results = db_ships_by_tags.get(["flagship"])
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results.should eq([Ship.yamato])
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end
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end
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describe "atomic operations" do
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it "safe_get and safe_get?" do
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db = DODB::SpecDataBase.new
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db_ships_by_name = db.new_index "name", &.name
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Ship.all_ships.each do |ship|
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db << ship
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end
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Ship.all_ships.each do |ship|
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db_ships_by_name.safe_get ship.name do |results|
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results.should eq(ship)
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end
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db_ships_by_name.safe_get? ship.name do |results|
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results.should eq(ship)
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end
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end
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end
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end
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describe "tools" do
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it "rebuilds indexes" do
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db = DODB::SpecDataBase.new
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db_ships_by_name = db.new_index "name", &.name
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db_ships_by_class = db.new_partition "class", &.klass
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db_ships_by_tags = db.new_tags "tags", &.tags
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Ship.all_ships.each do |ship|
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db << ship
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end
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db.reindex_everything!
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Ship.all_ships.each do |ship|
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db_ships_by_name.get?(ship.name).should eq(ship)
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db_ships_by_class.get(ship.klass).should contain(ship)
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end
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end
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it "migrates properly" do
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::FileUtils.rm_rf "test-storage-migration-origin"
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old_db = DODB::DataBase(PrimitiveShip).new "test-storage-migration-origin"
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old_ships_by_name = old_db.new_index "name", &.name
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old_ships_by_class = old_db.new_partition "class", &.class_name
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PrimitiveShip.all_ships.each do |ship|
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old_db << ship
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end
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# At this point, the “old” DB is filled. Now we need to convert
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# to the new DB.
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new_db = DODB::SpecDataBase.new "-migration-target"
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new_ships_by_name = new_db.new_index "name", &.name
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new_ships_by_class = new_db.new_partition "class", &.klass
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new_ships_by_tags = new_db.new_tags "tags", &.tags
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old_db.each_with_index do |ship, index|
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new_ship = Ship.new ship.name,
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klass: ship.class_name,
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id: ship.id,
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tags: Array(String).new.tap { |tags|
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tags << "name ship" if ship.name == ship.class_name
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}
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new_db[index] = new_ship
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end
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# At this point, the conversion is done, so… we’re making a few
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# arbitrary tests on the new data.
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old_db.each_with_index do |old_ship, old_index|
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ship = new_db[old_index]
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ship.id.should eq(old_ship.id)
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ship.klass.should eq(old_ship.class_name)
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ship.tags.any?(&.==("name ship")).should be_true if ship.name == ship.klass
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end
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end
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end
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end
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87
spec/test-data.cr
Normal file
87
spec/test-data.cr
Normal file
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require "uuid"
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require "json"
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# FIXME: Split the test data in separate files. We don’t care about those here.
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class Ship
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include JSON::Serializable
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def_clone
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property id : String
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property klass : String
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property name : String
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property tags : Array(String)
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def initialize(@name, @klass = "<unknown>", @id = UUID.random.to_s, @tags = [] of String)
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end
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# Makes testing arrays of this class easier.
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def <=>(other)
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@name <=> other.name
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end
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# Common, reusable test data.
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# Those data can be indexed, partitioned or tagged on different parameters,
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# and can easily be extended.
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class_getter kisaragi = Ship.new("Kisaragi", "Mutsuki")
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class_getter mutsuki = Ship.new("Mutsuki", "Mutsuki", tags: ["name ship"])
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class_getter yayoi = Ship.new("Yayoi", "Mutsuki")
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class_getter destroyers = [
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@@mutsuki,
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@@kisaragi,
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@@yayoi,
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Ship.new("Uzuki", "Mutsuki"),
|
||||
Ship.new("Satsuki", "Mutsuki"),
|
||||
|
||||
Ship.new("Shiratsuyu", "Shiratsuyu", tags: ["name ship"]),
|
||||
Ship.new("Murasame", "Shiratsuyu"),
|
||||
Ship.new("Yuudachi", "Shiratsuyu")
|
||||
]
|
||||
|
||||
class_getter yamato =
|
||||
Ship.new("Yamato", "Yamato", tags: ["name ship", "flagship"])
|
||||
class_getter flagship : Ship = yamato
|
||||
class_getter battleships = [
|
||||
@@yamato,
|
||||
Ship.new("Kongou", "Kongou", tags: ["name ship"]),
|
||||
Ship.new("Haruna", "Kongou"),
|
||||
Ship.new("Kirishima", "Kongou"),
|
||||
Ship.new("Hiei" , "Kongou"),
|
||||
Ship.new("Musashi", "Yamato"),
|
||||
Ship.new("Shinano", "Yamato")
|
||||
]
|
||||
|
||||
class_getter all_ships : Array(Ship) = @@destroyers + @@battleships
|
||||
|
||||
# Equality is true if every property is identical.
|
||||
def ==(other)
|
||||
@id == other.id && @klass == other.klass && @name == other.name &&
|
||||
@tags == other.tags
|
||||
end
|
||||
end
|
||||
|
||||
# This will be used for migration testing, but basically it’s a variant of
|
||||
# the class above, a few extra fields, a few missing ones.
|
||||
class PrimitiveShip
|
||||
include JSON::Serializable
|
||||
|
||||
property id : String
|
||||
property name : String
|
||||
property wooden : Bool = false # Will be removed.
|
||||
property class_name : String # Will be renamed
|
||||
property flagship : Bool = false # Will be moved to tags.
|
||||
|
||||
def initialize(@name, @class_name = "<unknown>", @id = UUID.random.to_s, @flagship = false)
|
||||
end
|
||||
|
||||
class_getter kamikaze =
|
||||
PrimitiveShip.new("Kamikaze", "Kamikaze")
|
||||
class_getter asakaze =
|
||||
PrimitiveShip.new("Asakaze", "Kamikaze")
|
||||
class_getter all_ships : Array(PrimitiveShip) = [
|
||||
@@kamikaze,
|
||||
@@asakaze
|
||||
]
|
||||
end
|
||||
89
spec/test.cr
89
spec/test.cr
@ -1,94 +1,9 @@
|
||||
require "spec"
|
||||
require "file_utils"
|
||||
require "json"
|
||||
require "uuid"
|
||||
|
||||
require "../src/*"
|
||||
require "../src/dodb.cr"
|
||||
require "./test-data.cr"
|
||||
|
||||
# FIXME: Split the test data in separate files. We don’t care about those here.
|
||||
|
||||
class Ship
|
||||
include JSON::Serializable
|
||||
|
||||
def_clone
|
||||
|
||||
property id : String
|
||||
property klass : String
|
||||
property name : String
|
||||
property tags : Array(String)
|
||||
|
||||
def initialize(@name, @klass = "<unknown>", @id = UUID.random.to_s, @tags = [] of String)
|
||||
end
|
||||
|
||||
# Makes testing arrays of this class easier.
|
||||
def <=>(other)
|
||||
@name <=> other.name
|
||||
end
|
||||
|
||||
# Common, reusable test data.
|
||||
# Those data can be indexed, partitioned or tagged on different parameters,
|
||||
# and can easily be extended.
|
||||
|
||||
class_getter kisaragi = Ship.new("Kisaragi", "Mutsuki")
|
||||
class_getter mutsuki = Ship.new("Mutsuki", "Mutsuki", tags: ["name ship"])
|
||||
class_getter yayoi = Ship.new("Yayoi", "Mutsuki")
|
||||
class_getter destroyers = [
|
||||
@@mutsuki,
|
||||
@@kisaragi,
|
||||
@@yayoi,
|
||||
Ship.new("Uzuki", "Mutsuki"),
|
||||
Ship.new("Satsuki", "Mutsuki"),
|
||||
|
||||
Ship.new("Shiratsuyu", "Shiratsuyu", tags: ["name ship"]),
|
||||
Ship.new("Murasame", "Shiratsuyu"),
|
||||
Ship.new("Yuudachi", "Shiratsuyu")
|
||||
]
|
||||
|
||||
class_getter yamato =
|
||||
Ship.new("Yamato", "Yamato", tags: ["name ship", "flagship"])
|
||||
class_getter flagship : Ship = yamato
|
||||
class_getter battleships = [
|
||||
@@yamato,
|
||||
Ship.new("Kongou", "Kongou", tags: ["name ship"]),
|
||||
Ship.new("Haruna", "Kongou"),
|
||||
Ship.new("Kirishima", "Kongou"),
|
||||
Ship.new("Hiei" , "Kongou"),
|
||||
Ship.new("Musashi", "Yamato"),
|
||||
Ship.new("Shinano", "Yamato")
|
||||
]
|
||||
|
||||
class_getter all_ships : Array(Ship) = @@destroyers + @@battleships
|
||||
|
||||
# Equality is true if every property is identical.
|
||||
def ==(other)
|
||||
@id == other.id && @klass == other.klass && @name == other.name &&
|
||||
@tags == other.tags
|
||||
end
|
||||
end
|
||||
|
||||
# This will be used for migration testing, but basically it’s a variant of
|
||||
# the class above, a few extra fields, a few missing ones.
|
||||
class PrimitiveShip
|
||||
include JSON::Serializable
|
||||
|
||||
property id : String
|
||||
property name : String
|
||||
property wooden : Bool = false # Will be removed.
|
||||
property class_name : String # Will be renamed
|
||||
property flagship : Bool = false # Will be moved to tags.
|
||||
|
||||
def initialize(@name, @class_name = "<unknown>", @id = UUID.random.to_s, @flagship = false)
|
||||
end
|
||||
|
||||
class_getter kamikaze =
|
||||
PrimitiveShip.new("Kamikaze", "Kamikaze")
|
||||
class_getter asakaze =
|
||||
PrimitiveShip.new("Asakaze", "Kamikaze")
|
||||
class_getter all_ships : Array(PrimitiveShip) = [
|
||||
@@kamikaze,
|
||||
@@asakaze
|
||||
]
|
||||
end
|
||||
|
||||
class DODB::SpecDataBase < DODB::DataBase(Ship)
|
||||
def initialize(storage_ext = "", remove_previous_data = true)
|
||||
|
||||
113
src/cached.cr
Normal file
113
src/cached.cr
Normal file
@ -0,0 +1,113 @@
|
||||
require "file_utils"
|
||||
require "json"
|
||||
|
||||
class Hash(K,V)
|
||||
def reverse
|
||||
rev = Array(Tuple(K,V)).new
|
||||
keys = Array(K).new
|
||||
each_key do |k|
|
||||
keys << k
|
||||
end
|
||||
keys.reverse.each do |k|
|
||||
rev << {k, self.[k]}
|
||||
end
|
||||
|
||||
rev
|
||||
end
|
||||
end
|
||||
|
||||
class DODB::CachedDataBase(V) < DODB::Storage(V)
|
||||
@indexers = [] of Indexer(V)
|
||||
property data = Hash(Int32, V).new
|
||||
|
||||
def initialize(@directory_name : String)
|
||||
Dir.mkdir_p data_path
|
||||
Dir.mkdir_p locks_directory
|
||||
|
||||
begin
|
||||
self.last_index
|
||||
rescue
|
||||
self.last_index = -1
|
||||
end
|
||||
|
||||
# TODO: load the database in RAM at start-up
|
||||
DODB::DataBase(V).new(@directory_name).each_with_index do |v, index|
|
||||
puts "loading value #{v} at index #{index}"
|
||||
self[index] = v
|
||||
end
|
||||
end
|
||||
|
||||
# Getting data from the hash in RAM.
|
||||
def []?(key : Int32) : V?
|
||||
@data[key]
|
||||
rescue e
|
||||
# FIXME: rescues any error the same way.
|
||||
return nil
|
||||
end
|
||||
def [](key : Int32) : V
|
||||
# raise MissingEntry.new(key) unless ::File.exists? file_path key
|
||||
# read file_path key
|
||||
@data[key] rescue raise MissingEntry.new(key)
|
||||
end
|
||||
|
||||
def []=(index : Int32, value : V)
|
||||
old_value = self.[index]?
|
||||
|
||||
check_collisions! index, value, old_value
|
||||
|
||||
# Removes any old indices or partitions pointing to a value about
|
||||
# to be replaced.
|
||||
if old_value
|
||||
remove_partitions index, old_value
|
||||
end
|
||||
|
||||
# Avoids corruption in case the application crashes while writing.
|
||||
file_path(index).tap do |path|
|
||||
::File.write "#{path}.new", value.to_json
|
||||
::FileUtils.mv "#{path}.new", path
|
||||
end
|
||||
|
||||
write_partitions index, value
|
||||
|
||||
if index > last_index
|
||||
self.last_index = index
|
||||
end
|
||||
|
||||
@data[index] = value
|
||||
end
|
||||
|
||||
##
|
||||
# Can be useful for making dumps or to restore a database.
|
||||
def each_with_index(reversed : Bool = false, start_offset = 0, end_offset : Int32? = nil)
|
||||
i = -1 # do not trust key to be the right index
|
||||
(reversed ? @data.reverse : @data).each do |index, v|
|
||||
i += 1
|
||||
next if start_offset > i
|
||||
break unless end_offset.nil? || i <= end_offset
|
||||
|
||||
yield v, index
|
||||
end
|
||||
end
|
||||
|
||||
def delete(key : Int32)
|
||||
value = self[key]?
|
||||
|
||||
return if value.nil?
|
||||
|
||||
begin
|
||||
::File.delete file_path key
|
||||
rescue
|
||||
# FIXME: Only intercept “no such file" errors
|
||||
end
|
||||
|
||||
remove_partitions key, value
|
||||
|
||||
@data.delete key
|
||||
value
|
||||
end
|
||||
|
||||
private def remove_data!
|
||||
super
|
||||
@data = Hash(Int32, V).new
|
||||
end
|
||||
end
|
||||
312
src/dodb.cr
312
src/dodb.cr
@ -3,18 +3,26 @@ require "json"
|
||||
|
||||
require "./dodb/*"
|
||||
|
||||
class DODB::DataBase(V)
|
||||
@indexers = [] of Indexer(V)
|
||||
abstract class DODB::Storage(V)
|
||||
property directory_name : String
|
||||
|
||||
def initialize(@directory_name : String)
|
||||
Dir.mkdir_p data_path
|
||||
Dir.mkdir_p locks_directory
|
||||
end
|
||||
|
||||
begin
|
||||
self.last_index
|
||||
rescue
|
||||
self.last_index = -1
|
||||
def request_lock(name)
|
||||
r = -1
|
||||
file_path = get_lock_file_path name
|
||||
file_perms = 0o644
|
||||
|
||||
flags = LibC::O_EXCL | LibC::O_CREAT
|
||||
while (r = LibC.open file_path, flags, file_perms) == -1
|
||||
sleep 1.milliseconds
|
||||
end
|
||||
|
||||
LibC.close r
|
||||
end
|
||||
def release_lock(name)
|
||||
File.delete get_lock_file_path name
|
||||
end
|
||||
|
||||
private def index_file
|
||||
@ -44,28 +52,52 @@ class DODB::DataBase(V)
|
||||
end
|
||||
end
|
||||
|
||||
def request_lock(name)
|
||||
r = -1
|
||||
file_path = get_lock_file_path name
|
||||
file_perms = 0o644
|
||||
|
||||
flags = LibC::O_EXCL | LibC::O_CREAT
|
||||
while (r = LibC.open file_path, flags, file_perms) == -1
|
||||
sleep 1.milliseconds
|
||||
end
|
||||
|
||||
LibC.close r
|
||||
def <<(item : V)
|
||||
index = last_index + 1
|
||||
self[index] = item
|
||||
self.last_index = index
|
||||
end
|
||||
def release_lock(name)
|
||||
File.delete get_lock_file_path name
|
||||
|
||||
def each(reversed : Bool = false, start_offset = 0, end_offset : Int32? = nil)
|
||||
each_with_index(
|
||||
reversed: reversed,
|
||||
start_offset: start_offset,
|
||||
end_offset: end_offset
|
||||
) do |item, index|
|
||||
yield item
|
||||
end
|
||||
end
|
||||
|
||||
##
|
||||
# name is the name that will be used on the file system.
|
||||
def new_partition(name : String, &block : Proc(V, String))
|
||||
Partition(V).new(self, @directory_name, name, block).tap do |table|
|
||||
@indexers << table
|
||||
# CAUTION: Very slow. Try not to use.
|
||||
def to_a(reversed : Bool = false, start_offset = 0, end_offset : Int32? = nil)
|
||||
array = ::Array(V).new
|
||||
|
||||
each(
|
||||
reversed: reversed,
|
||||
start_offset: start_offset,
|
||||
end_offset: end_offset
|
||||
) do |value|
|
||||
array << value
|
||||
end
|
||||
|
||||
array
|
||||
end
|
||||
|
||||
##
|
||||
# CAUTION: Very slow. Try not to use.
|
||||
def to_h(reversed : Bool = false, start_offset = 0, end_offset : Int32? = nil)
|
||||
hash = ::Hash(Int32, V).new
|
||||
|
||||
each_with_index(
|
||||
reversed: reversed,
|
||||
start_offset: start_offset,
|
||||
end_offset: end_offset
|
||||
) do |element, index|
|
||||
hash[index] = element
|
||||
end
|
||||
|
||||
hash
|
||||
end
|
||||
|
||||
##
|
||||
@ -76,6 +108,14 @@ class DODB::DataBase(V)
|
||||
end
|
||||
end
|
||||
|
||||
##
|
||||
# name is the name that will be used on the file system.
|
||||
def new_partition(name : String, &block : Proc(V, String))
|
||||
Partition(V).new(self, @directory_name, name, block).tap do |table|
|
||||
@indexers << table
|
||||
end
|
||||
end
|
||||
|
||||
def new_tags(name : String, &block : Proc(V, Array(String)))
|
||||
Tags(V).new(@directory_name, name, block).tap do |tags|
|
||||
@indexers << tags
|
||||
@ -100,12 +140,103 @@ class DODB::DataBase(V)
|
||||
partition.not_nil!.as(DODB::Tags).get name, key
|
||||
end
|
||||
|
||||
def <<(item : V)
|
||||
index = last_index + 1
|
||||
def check_collisions!(key : Int32, value : V, old_value : V?)
|
||||
@indexers.each &.check!(stringify_key(key), value, old_value)
|
||||
end
|
||||
|
||||
self[index] = item
|
||||
def write_partitions(key : Int32, value : V)
|
||||
@indexers.each &.index(stringify_key(key), value)
|
||||
end
|
||||
|
||||
self.last_index = index
|
||||
def pop
|
||||
index = last_index
|
||||
|
||||
# Some entries may have been removed. We’ll skip over those.
|
||||
# Not the most efficient if a large number of indices are empty.
|
||||
while index >= 0 && self[index]?.nil?
|
||||
index = index - 1
|
||||
end
|
||||
|
||||
if index < 0
|
||||
return nil
|
||||
end
|
||||
|
||||
poped = self[index]
|
||||
|
||||
self.delete index
|
||||
|
||||
last_index = index - 1
|
||||
|
||||
poped
|
||||
end
|
||||
|
||||
private def data_path
|
||||
"#{@directory_name}/data"
|
||||
end
|
||||
|
||||
private def file_path(key : Int32)
|
||||
"#{data_path}/%010i.json" % key
|
||||
end
|
||||
|
||||
private def locks_directory : String
|
||||
"#{@directory_name}/locks"
|
||||
end
|
||||
|
||||
private def get_lock_file_path(name : String)
|
||||
"#{locks_directory}/#{name}.lock"
|
||||
end
|
||||
|
||||
private def read(file_path : String)
|
||||
V.from_json ::File.read file_path
|
||||
end
|
||||
|
||||
private def remove_data!
|
||||
FileUtils.rm_rf data_path
|
||||
Dir.mkdir_p data_path
|
||||
end
|
||||
|
||||
private def remove_indexing!
|
||||
@indexers.each do |indexer|
|
||||
FileUtils.rm_rf indexer.indexing_directory
|
||||
end
|
||||
end
|
||||
|
||||
# A very slow operation that removes all indices and then rewrites
|
||||
# them all.
|
||||
# FIXME: Is this really useful in its current form? We should remove the
|
||||
# index directories, not the indices based on our current (and
|
||||
# possiblly different from what’s stored) data.
|
||||
def reindex_everything!
|
||||
old_data = to_h
|
||||
|
||||
remove_indexing!
|
||||
remove_data!
|
||||
|
||||
old_data.each do |index, item|
|
||||
self[index] = item
|
||||
end
|
||||
end
|
||||
|
||||
def remove_partitions(key : Int32, value : V)
|
||||
@indexers.each &.deindex(stringify_key(key), value)
|
||||
end
|
||||
|
||||
abstract def [](key : Int32)
|
||||
abstract def delete(key : Int32)
|
||||
end
|
||||
|
||||
class DODB::DataBase(V) < DODB::Storage(V)
|
||||
@indexers = [] of Indexer(V)
|
||||
|
||||
def initialize(@directory_name : String)
|
||||
Dir.mkdir_p data_path
|
||||
Dir.mkdir_p locks_directory
|
||||
|
||||
begin
|
||||
self.last_index
|
||||
rescue
|
||||
self.last_index = -1
|
||||
end
|
||||
end
|
||||
|
||||
def []?(key : Int32) : V?
|
||||
@ -145,36 +276,6 @@ class DODB::DataBase(V)
|
||||
end
|
||||
end
|
||||
|
||||
def check_collisions!(key : Int32, value : V, old_value : V?)
|
||||
@indexers.each &.check!(stringify_key(key), value, old_value)
|
||||
end
|
||||
|
||||
def write_partitions(key : Int32, value : V)
|
||||
@indexers.each &.index(stringify_key(key), value)
|
||||
end
|
||||
|
||||
def pop
|
||||
index = last_index
|
||||
|
||||
# Some entries may have been removed. We’ll skip over those.
|
||||
# Not the most efficient if a large number of indices are empty.
|
||||
while index >= 0 && self[index]?.nil?
|
||||
index = index - 1
|
||||
end
|
||||
|
||||
if index < 0
|
||||
return nil
|
||||
end
|
||||
|
||||
poped = self[index]
|
||||
|
||||
self.delete index
|
||||
|
||||
last_index = index - 1
|
||||
|
||||
poped
|
||||
end
|
||||
|
||||
def delete(key : Int32)
|
||||
value = self[key]?
|
||||
|
||||
@ -191,10 +292,6 @@ class DODB::DataBase(V)
|
||||
value
|
||||
end
|
||||
|
||||
def remove_partitions(key : Int32, value : V)
|
||||
@indexers.each &.deindex(stringify_key(key), value)
|
||||
end
|
||||
|
||||
private def each_key(reversed = false)
|
||||
start = 0
|
||||
_end = last_index
|
||||
@ -246,93 +343,6 @@ class DODB::DataBase(V)
|
||||
yield field, key
|
||||
end
|
||||
end
|
||||
def each(reversed : Bool = false, start_offset = 0, end_offset : Int32? = nil)
|
||||
each_with_index(
|
||||
reversed: reversed,
|
||||
start_offset: start_offset,
|
||||
end_offset: end_offset
|
||||
) do |item, index|
|
||||
yield item
|
||||
end
|
||||
end
|
||||
|
||||
##
|
||||
# CAUTION: Very slow. Try not to use.
|
||||
def to_a(reversed : Bool = false, start_offset = 0, end_offset : Int32? = nil)
|
||||
array = ::Array(V).new
|
||||
|
||||
each(
|
||||
reversed: reversed,
|
||||
start_offset: start_offset,
|
||||
end_offset: end_offset
|
||||
) do |value|
|
||||
array << value
|
||||
end
|
||||
|
||||
array
|
||||
end
|
||||
|
||||
##
|
||||
# CAUTION: Very slow. Try not to use.
|
||||
def to_h(reversed : Bool = false, start_offset = 0, end_offset : Int32? = nil)
|
||||
hash = ::Hash(Int32, V).new
|
||||
|
||||
each_with_index(
|
||||
reversed: reversed,
|
||||
start_offset: start_offset,
|
||||
end_offset: end_offset
|
||||
) do |element, index|
|
||||
hash[index] = element
|
||||
end
|
||||
|
||||
hash
|
||||
end
|
||||
|
||||
private def data_path
|
||||
"#{@directory_name}/data"
|
||||
end
|
||||
|
||||
private def file_path(key : Int32)
|
||||
"#{data_path}/%010i.json" % key
|
||||
end
|
||||
|
||||
private def locks_directory : String
|
||||
"#{@directory_name}/locks"
|
||||
end
|
||||
|
||||
private def get_lock_file_path(name : String)
|
||||
"#{locks_directory}/#{name}.lock"
|
||||
end
|
||||
|
||||
private def read(file_path : String)
|
||||
V.from_json ::File.read file_path
|
||||
end
|
||||
|
||||
private def remove_data!
|
||||
FileUtils.rm_rf data_path
|
||||
Dir.mkdir_p data_path
|
||||
end
|
||||
|
||||
private def remove_indexing!
|
||||
@indexers.each do |indexer|
|
||||
FileUtils.rm_rf indexer.indexing_directory
|
||||
end
|
||||
end
|
||||
|
||||
# A very slow operation that removes all indices and then rewrites
|
||||
# them all.
|
||||
# FIXME: Is this really useful in its current form? We should remove the
|
||||
# index directories, not the indices based on our current (and
|
||||
# possiblly different from what’s stored) data.
|
||||
def reindex_everything!
|
||||
old_data = to_h
|
||||
|
||||
remove_indexing!
|
||||
remove_data!
|
||||
|
||||
old_data.each do |index, item|
|
||||
self[index] = item
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
require "./cached.cr"
|
||||
|
||||
@ -9,7 +9,7 @@ class DODB::Index(V) < DODB::Indexer(V)
|
||||
property key_proc : Proc(V, String)
|
||||
getter storage_root : String
|
||||
|
||||
@storage : DODB::DataBase(V)
|
||||
@storage : DODB::Storage(V)
|
||||
|
||||
def initialize(@storage, @storage_root, @name, @key_proc)
|
||||
Dir.mkdir_p indexing_directory
|
||||
|
||||
@ -8,7 +8,7 @@ class DODB::Partition(V) < DODB::Indexer(V)
|
||||
property key_proc : Proc(V, String)
|
||||
getter storage_root : String
|
||||
|
||||
@storage : DODB::DataBase(V)
|
||||
@storage : DODB::Storage(V)
|
||||
|
||||
def initialize(@storage, @storage_root, @name, @key_proc)
|
||||
::Dir.mkdir_p indexing_directory
|
||||
|
||||
Loading…
Reference in New Issue
Block a user