Java example source code file (StripedTest.java)

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Java - Java tags/keywords

iterable, list, lock_suppler, object, override, read_write_lock_supplier, readwritelock, runtimeexception, semaphore_suppler, set, striped, supplier, testcase, threading, threads, util, weakreference

The StripedTest.java Java example source code

/*
 * Copyright (C) 2011 The Guava Authors
 *
 * 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.common.util.concurrent;

import static com.google.common.collect.Iterables.concat;

import com.google.common.base.Functions;
import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Ordering;
import com.google.common.collect.Sets;
import com.google.common.testing.GcFinalization;
import com.google.common.testing.NullPointerTester;

import junit.framework.TestCase;

import java.lang.ref.WeakReference;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Semaphore;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 * Tests for Striped.
 *
 * @author Dimitris Andreou
 */
public class StripedTest extends TestCase {
  private static List<Striped strongImplementations() {
    return ImmutableList.of(
        Striped.readWriteLock(100),
        Striped.readWriteLock(256),
        Striped.lock(100),
        Striped.lock(256),
        Striped.semaphore(100, 1),
        Striped.semaphore(256, 1));
  }

  private static final Supplier<ReadWriteLock> READ_WRITE_LOCK_SUPPLIER =
      new Supplier<ReadWriteLock>() {
    @Override public ReadWriteLock get() {
      return new ReentrantReadWriteLock();
    }
  };

  private static final Supplier<Lock> LOCK_SUPPLER = new Supplier() {
    @Override public Lock get() {
      return new ReentrantLock();
    }
  };

  private static final Supplier<Semaphore> SEMAPHORE_SUPPLER = new Supplier() {
    @Override public Semaphore get() {
      return new Semaphore(1, false);
    }
  };

  private static List<Striped weakImplementations() {
    return ImmutableList.<Stripedbuilder()
        .add(new Striped.SmallLazyStriped<ReadWriteLock>(50, READ_WRITE_LOCK_SUPPLIER))
        .add(new Striped.SmallLazyStriped<ReadWriteLock>(64, READ_WRITE_LOCK_SUPPLIER))
        .add(new Striped.LargeLazyStriped<ReadWriteLock>(50, READ_WRITE_LOCK_SUPPLIER))
        .add(new Striped.LargeLazyStriped<ReadWriteLock>(64, READ_WRITE_LOCK_SUPPLIER))
        .add(new Striped.SmallLazyStriped<Lock>(50, LOCK_SUPPLER))
        .add(new Striped.SmallLazyStriped<Lock>(64, LOCK_SUPPLER))
        .add(new Striped.LargeLazyStriped<Lock>(50, LOCK_SUPPLER))
        .add(new Striped.LargeLazyStriped<Lock>(64, LOCK_SUPPLER))
        .add(new Striped.SmallLazyStriped<Semaphore>(50, SEMAPHORE_SUPPLER))
        .add(new Striped.SmallLazyStriped<Semaphore>(64, SEMAPHORE_SUPPLER))
        .add(new Striped.LargeLazyStriped<Semaphore>(50, SEMAPHORE_SUPPLER))
        .add(new Striped.LargeLazyStriped<Semaphore>(64, SEMAPHORE_SUPPLER))
        .build();
  }

  private static Iterable<Striped allImplementations() {
    return concat(strongImplementations(), weakImplementations());
  }

  public void testNull() throws Exception {
    for (Striped<?> striped : allImplementations()) {
      new NullPointerTester().testAllPublicInstanceMethods(striped);
    }
  }

  public void testSizes() {
    // not bothering testing all variations, since we know they share implementations
    assertTrue(Striped.lock(100).size() >= 100);
    assertTrue(Striped.lock(256).size() == 256);
    assertTrue(Striped.lazyWeakLock(100).size() >= 100);
    assertTrue(Striped.lazyWeakLock(256).size() == 256);
  }

  public void testWeakImplementations() {
    for (Striped<?> striped : weakImplementations()) {
      WeakReference<Object> weakRef = new WeakReference