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Java example source code file (ForwardingCacheTest.java)

This example Java source code file (ForwardingCacheTest.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

boolean, cache, executionexception, forwardingcache, forwardingcachetest, onlyget, override, suppresswarnings, testcase, threading, threads

The ForwardingCacheTest.java Java example source code

/*
 * Copyright (C) 2009 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.cache;

import static org.easymock.EasyMock.createMock;
import static org.easymock.EasyMock.expect;
import static org.easymock.EasyMock.replay;
import static org.easymock.EasyMock.verify;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;

import junit.framework.TestCase;

import java.util.concurrent.ExecutionException;

/**
 * Unit test for {@link ForwardingCache}.
 *
 * @author Charles Fry
 */
public class ForwardingCacheTest extends TestCase {
  private Cache<String, Boolean> forward;
  private Cache<String, Boolean> mock;

  @SuppressWarnings("unchecked") // createMock
  @Override public void setUp() throws Exception {
    super.setUp();
    /*
     * Class parameters must be raw, so we can't create a proxy with generic
     * type arguments. The created proxy only records calls and returns null, so
     * the type is irrelevant at runtime.
     */
    mock = createMock(Cache.class);
    forward = new ForwardingCache<String, Boolean>() {
      @Override protected Cache<String, Boolean> delegate() {
        return mock;
      }
    };
  }

  public void testGetIfPresent() throws ExecutionException {
    expect(mock.getIfPresent("key")).andReturn(Boolean.TRUE);
    replay(mock);
    assertSame(Boolean.TRUE, forward.getIfPresent("key"));
    verify(mock);
  }

  public void testGetAllPresent() throws ExecutionException {
    expect(mock.getAllPresent(ImmutableList.of("key")))
        .andReturn(ImmutableMap.of("key", Boolean.TRUE));
    replay(mock);
    assertEquals(ImmutableMap.of("key", Boolean.TRUE),
        forward.getAllPresent(ImmutableList.of("key")));
    verify(mock);
  }

  public void testInvalidate() {
    mock.invalidate("key");
    replay(mock);
    forward.invalidate("key");
    verify(mock);
  }

  public void testInvalidateAllIterable() {
    mock.invalidateAll(ImmutableList.of("key"));
    replay(mock);
    forward.invalidateAll(ImmutableList.of("key"));
    verify(mock);
  }

  public void testInvalidateAll() {
    mock.invalidateAll();
    replay(mock);
    forward.invalidateAll();
    verify(mock);
  }

  public void testSize() {
    expect(mock.size()).andReturn(0L);
    replay(mock);
    forward.size();
    verify(mock);
  }

  public void testStats() {
    expect(mock.stats()).andReturn(null);
    replay(mock);
    assertNull(forward.stats());
    verify(mock);
  }

  public void testAsMap() {
    expect(mock.asMap()).andReturn(null);
    replay(mock);
    assertNull(forward.asMap());
    verify(mock);
  }

  public void testCleanUp() {
    mock.cleanUp();
    replay(mock);
    forward.cleanUp();
    verify(mock);
  }

  /**
   * Make sure that all methods are forwarded.
   */
  private static class OnlyGet<K, V> extends ForwardingCache {
    @Override
    protected Cache<K, V> delegate() {
      return null;
    }
  }
}

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