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Roey BermanandGitHub
ca3db91ab3
## What changed? Added a OnceMap collection to common. > OnceMap is a concurrent map which lazily constructs its values. Map values are initialized on-the-fly, using a > provided construction function only when a key is accessed for the first time. ## Why? I have a couple of uses for it in the nexus branch. ## How did you test it? Added unit tests
51 lines
1.6 KiB
Go
51 lines
1.6 KiB
Go
// The MIT License
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//
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// Copyright (c) 2024 Temporal Technologies Inc. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package collection
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import (
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"sync/atomic"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestOnceMap(t *testing.T) {
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counter := atomic.Int32{}
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m := NewOnceMap(func(k string) int {
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return int(counter.Add(1))
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})
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foo1 := m.Get("foo")
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foo2 := m.Get("foo")
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require.Equal(t, 1, foo1)
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require.Equal(t, 1, foo2)
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bar1 := m.Get("bar")
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bar2 := m.Get("bar")
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require.Equal(t, 2, bar1)
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require.Equal(t, 2, bar2)
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}
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