| // Copyright 2023 The Bazel Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| package com.google.devtools.build.lib.concurrent; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| |
| import com.google.devtools.build.lib.concurrent.PooledInterner.Pool; |
| import javax.annotation.Nullable; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** Unit tests for {@link PooledInterner} class, with and without global pool set. */ |
| @RunWith(JUnit4.class) |
| public final class PooledInternerTest { |
| @Nullable private Pool<ObjectForInternerTests> pool = null; |
| |
| private final PooledInterner<ObjectForInternerTests> interner = |
| new PooledInterner<>() { |
| @Nullable |
| @Override |
| protected Pool<ObjectForInternerTests> getPool() { |
| return pool; |
| } |
| }; |
| |
| private ObjectForInternerTests createInterned(String arg) { |
| return interner.intern(new ObjectForInternerTests(arg)); |
| } |
| |
| @Test |
| public void pooledInternerInterner_noGlobalPoolTestIntern() { |
| ObjectForInternerTests keyToIntern1 = createInterned(/* arg= */ "HelloWorld"); |
| |
| // Interning a duplicate instance will result the same instance to be returned. |
| assertThat(createInterned(/* arg= */ "HelloWorld")).isSameInstanceAs(keyToIntern1); |
| } |
| |
| @Test |
| public void pooledInternerInterner_noGlobalPoolTestRemoval() { |
| ObjectForInternerTests keyToIntern1 = createInterned(/* arg= */ "HelloWorld"); |
| |
| assertThat(createInterned(/* arg= */ "HelloWorld")).isSameInstanceAs(keyToIntern1); |
| |
| // Remove one instance from the interner and re-intern a duplicate one. The newly interned |
| // instance is different from the previous one, which confirms that the previous interned |
| // instance has already been successfully removed from the interner. |
| interner.removeWeak(keyToIntern1); |
| assertThat(createInterned(/* arg= */ "HelloWorld")).isNotSameInstanceAs(keyToIntern1); |
| } |
| |
| @Test |
| public void pooledInternerInterner_withGlobalPool() { |
| ObjectForInternerTests keyInPool = new ObjectForInternerTests(/* arg= */ "FooBar"); |
| pool = |
| sample -> { |
| if (sample.arg.equals("FooBar")) { |
| return keyInPool; |
| } else { |
| return interner.weakIntern(sample); |
| } |
| }; |
| |
| // If interned instance already exists in the pool, expect to get the pooled instance. |
| assertThat(createInterned(/* arg= */ "FooBar")).isSameInstanceAs(keyInPool); |
| |
| // If interned instance does not exist in the pool, expect it to be weak interned. So interning |
| // a duplicate instance will result the same instance to be returned. |
| ObjectForInternerTests keyToIntern1 = createInterned(/* arg= */ "HelloWorld"); |
| assertThat(createInterned(/* arg= */ "HelloWorld")).isSameInstanceAs(keyToIntern1); |
| } |
| |
| static final class ObjectForInternerTests { |
| private final String arg; |
| |
| private ObjectForInternerTests(String arg) { |
| this.arg = arg; |
| } |
| |
| @Override |
| public int hashCode() { |
| return arg.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| return obj instanceof ObjectForInternerTests |
| && arg.equals(((ObjectForInternerTests) obj).arg); |
| } |
| } |
| } |