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// Copyright 2015 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.skyframe;
import static com.google.common.truth.Truth.assertThat;
import com.google.common.collect.Interner;
import com.google.devtools.build.lib.concurrent.BlazeInterners;
import com.google.devtools.build.lib.testutil.TestUtils;
import java.io.Serializable;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Unit test for the SkyKey class, checking hash code transience logic.
*/
@RunWith(JUnit4.class)
public class SkyKeyTest {
@Test
public void testHashCodeTransience() throws Exception {
// Given a freshly constructed HashCodeSpy object,
HashCodeSpy hashCodeSpy = new HashCodeSpy();
assertThat(hashCodeSpy.getNumberOfTimesHashCodeCalled()).isEqualTo(0);
// When a SkyKey is constructed with that HashCodeSpy as its argument,
SkyKey originalKey = Key.create(hashCodeSpy);
// Then the HashCodeSpy reports that its hashcode method was called once.
assertThat(hashCodeSpy.getNumberOfTimesHashCodeCalled()).isEqualTo(1);
// When the SkyKey's hashCode method is called,
originalKey.hashCode();
// Then the spy's hashCode method isn't called, because the SkyKey's hashCode was cached.
assertThat(hashCodeSpy.getNumberOfTimesHashCodeCalled()).isEqualTo(1);
// When that SkyKey is serialized and then deserialized,
SkyKey newKey = (SkyKey) TestUtils.deserializeObject(TestUtils.serializeObject(originalKey));
// Then the new SkyKey's HashCodeSpy has not had its hashCode method called.
HashCodeSpy spyInNewKey = (HashCodeSpy) newKey.argument();
assertThat(spyInNewKey.getNumberOfTimesHashCodeCalled()).isEqualTo(0);
// When the new SkyKey's hashCode method is called once,
newKey.hashCode();
// Then the new SkyKey's spy's hashCode method gets called.
assertThat(spyInNewKey.getNumberOfTimesHashCodeCalled()).isEqualTo(1);
// When the new SkyKey's hashCode method is called a second time,
newKey.hashCode();
// Then the new SkyKey's spy's hashCOde isn't called a second time, because the SkyKey's
// hashCode was cached.
assertThat(spyInNewKey.getNumberOfTimesHashCodeCalled()).isEqualTo(1);
}
private static class HashCodeSpy implements Serializable {
private transient int numberOfTimesHashCodeCalled;
public int getNumberOfTimesHashCodeCalled() {
return numberOfTimesHashCodeCalled;
}
@Override
public int hashCode() {
numberOfTimesHashCodeCalled++;
return 42;
}
}
private static class Key extends AbstractSkyKey<HashCodeSpy> {
private static final Interner<Key> interner = BlazeInterners.newWeakInterner();
private Key(HashCodeSpy arg) {
super(arg);
}
private static Key create(HashCodeSpy arg) {
return interner.intern(new Key(arg));
}
@Override
public SkyFunctionName functionName() {
return SkyFunctionName.FOR_TESTING;
}
}
}
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