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Java example source code file (WeakKeySetUtils.java)

This example Java source code file (WeakKeySetUtils.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

injectorimpl, interruptedexception, key, object, runtimeexception, set, util, weakkeysetutils

The WeakKeySetUtils.java Java example source code

/**
 * Copyright (C) 2014 Google Inc.
 *
 *  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.inject.internal;

import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertFalse;
import static junit.framework.Assert.assertNotNull;
import static junit.framework.Assert.assertNull;
import static junit.framework.Assert.assertTrue;

import com.google.inject.Injector;
import com.google.inject.Key;

import java.util.Set;

/**
 * Utilities for verifying com.google.inject.internal.WeakKeySet is not leaking memory.
 *
 * @author dweis@google.com (Daniel Weis)
 */
public final class WeakKeySetUtils {

  private WeakKeySetUtils() {}

  public static void assertBlacklisted(Injector injector, Key<?> key) {
    assertBlacklistState(injector, key, true);
  }

  public static void assertNotBlacklisted(Injector injector, Key<?> key) {
    assertBlacklistState(injector, key, false);
  }

  public static void assertNotInSet(WeakKeySet set, Key<?> key) {
    // if we're expecting it to not be in the set, loop around and wait for threads to run.
    for (int i = 0; i < 10; i++) {
      if (!set.contains(key)) {
        break;
      }
      sleep();
    }
    assertFalse(set.contains(key));
    assertNull(set.getSources(Key.get(Integer.class)));
  }

  public static void assertInSet(WeakKeySet set, Key<?> key, int expectedSources,
      Object... sources) {
    assertTrue(set.contains(key));
    assertEquals(expectedSources, set.getSources(key).size());
    for (Object source : sources) {
      assertTrue("didn't contain source: " + source, set.getSources(key).contains(source));
    }
  }

  public static void assertSourceNotInSet(WeakKeySet set, Key<?> key, Object source) {
    // if we're expecting it to not be a source, loop around and wait for threads to run.
    for (int i = 0; i < 10; i++) {
      Set<Object> sources = set.getSources(key);
      assertNotNull("expected at least one source", source);
      if (!sources.contains(source)) {
        break;
      }
      sleep();
    }
    Set<Object> sources = set.getSources(key);
    assertNotNull("expected at least one source", source);
    assertFalse(sources.contains(source));
  }

  private static void assertBlacklistState(Injector injector, Key<?> key, boolean isBlacklisted) {
    // if we're expecting it to not be blacklisted, loop around and wait for threads to run.
    if (!isBlacklisted) {
      for (int i = 0; i < 10; i++) {
        if (!((InjectorImpl) injector).state.isBlacklisted(key)) {
          break;
        }
        sleep();
      }
    }
    assertEquals(isBlacklisted, ((InjectorImpl) injector).state.isBlacklisted(key));
  }

  private static void sleep() {
    try {
      Thread.sleep(1000);
    } catch (InterruptedException e) {
      throw new RuntimeException(e);
    }
    Thread.yield();
  }
}

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