84 lines
2.0 KiB
Ruby
84 lines
2.0 KiB
Ruby
#
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# micro_indirect.rb
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#
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# This source file is part of the FoundationDB open source project
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#
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# Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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require 'fdb'
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FDB.api_version 300
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class Workspace
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def initialize(directory,db)
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@dir = directory
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@db = db
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end
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def enter()
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@dir.create_or_open(@db,["new".encode('utf-8')])
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end
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def exit()
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update(@db)
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end
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def update(db)
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db.transact do |tr|
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@dir.remove(tr,["current".encode('utf-8')])
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@dir.move(tr,["new".encode('utf-8')],["current".encode('utf-8')])
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end
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end
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def current()
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@dir.create_or_open(@db,["current".encode('utf-8')])
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end
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end
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def clear_subspace(db,subspace)
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db.transact do |tr|
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tr.clear_range_start_with(subspace.key)
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end
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end
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def print_subspace(db,subspace)
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db.transact do |tr|
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tr.get_range(*subspace.range()) do |kv|
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print subspace.unpack(kv.key)
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puts kv.value
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end
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end
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end
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def smoke_test()
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db = FDB.open()
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working_dir = FDB::directory.create_or_open(db,["working".encode('utf-8')])
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workspace = Workspace.new(working_dir,db)
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current = workspace.current()
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clear_subspace(db,current)
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db[current[1]] = 'a'
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db[current[2]] = 'b'
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puts "contents:"
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print_subspace(db,current)
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newspace = workspace.enter()
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clear_subspace(db,newspace)
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db[newspace[3]] = 'c'
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db[newspace[4]] = 'd'
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workspace.exit()
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puts "contents"
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print_subspace(db,workspace.current())
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end
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smoke_test()
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