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Java example source code file (AbstractLoadingCacheTest.java)

This example Java source code file (AbstractLoadingCacheTest.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

abstractloadingcache, abstractloadingcachetest, atomicreference, executionerror, executionexception, object, override, runtimeexception, testcase, threading, threads, throwable, uncheckedexecutionexception

The AbstractLoadingCacheTest.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.cache;

import com.google.common.util.concurrent.ExecutionError;
import com.google.common.util.concurrent.UncheckedExecutionException;

import junit.framework.TestCase;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.atomic.AtomicReference;

/**
 * Unit test for {@link AbstractLoadingCache}.
 *
 * @author Charles Fry
 */
public class AbstractLoadingCacheTest extends TestCase {

  public void testGetUnchecked_checked() {
    final Exception cause = new Exception();
    final AtomicReference<Object> valueRef = new AtomicReference();
    LoadingCache<Object, Object> cache = new AbstractLoadingCache() {
      @Override
      public Object get(Object key) throws ExecutionException {
        Object v = valueRef.get();
        if (v == null) {
          throw new ExecutionException(cause);
        }
        return v;
      }

      @Override
      public Object getIfPresent(Object key) {
        return valueRef.get();
      }
    };

    try {
      cache.getUnchecked(new Object());
      fail();
    } catch (UncheckedExecutionException expected) {
      assertEquals(cause, expected.getCause());
    }

    Object newValue = new Object();
    valueRef.set(newValue);
    assertSame(newValue, cache.getUnchecked(new Object()));
  }

  public void testGetUnchecked_unchecked() {
    final RuntimeException cause = new RuntimeException();
    final AtomicReference<Object> valueRef = new AtomicReference();
    LoadingCache<Object, Object> cache = new AbstractLoadingCache() {
      @Override
      public Object get(Object key) throws ExecutionException {
        Object v = valueRef.get();
        if (v == null) {
          throw new ExecutionException(cause);
        }
        return v;
      }

      @Override
      public Object getIfPresent(Object key) {
        return valueRef.get();
      }
    };

    try {
      cache.getUnchecked(new Object());
      fail();
    } catch (UncheckedExecutionException expected) {
      assertEquals(cause, expected.getCause());
    }

    Object newValue = new Object();
    valueRef.set(newValue);
    assertSame(newValue, cache.getUnchecked(new Object()));
  }

  public void testGetUnchecked_error() {
    final Error cause = new Error();
    final AtomicReference<Object> valueRef = new AtomicReference();
    LoadingCache<Object, Object> cache = new AbstractLoadingCache() {
      @Override
      public Object get(Object key) throws ExecutionException {
        Object v = valueRef.get();
        if (v == null) {
          throw new ExecutionError(cause);
        }
        return v;
      }

      @Override
      public Object getIfPresent(Object key) {
        return valueRef.get();
      }
    };

    try {
      cache.getUnchecked(new Object());
      fail();
    } catch (ExecutionError expected) {
      assertEquals(cause, expected.getCause());
    }

    Object newValue = new Object();
    valueRef.set(newValue);
    assertSame(newValue, cache.getUnchecked(new Object()));
  }

  public void testGetUnchecked_otherThrowable() {
    final Throwable cause = new Throwable();
    final AtomicReference<Object> valueRef = new AtomicReference();
    LoadingCache<Object, Object> cache = new AbstractLoadingCache() {
      @Override
      public Object get(Object key) throws ExecutionException {
        Object v = valueRef.get();
        if (v == null) {
          throw new ExecutionException(cause);
        }
        return v;
      }

      @Override
      public Object getIfPresent(Object key) {
        return valueRef.get();
      }
    };

    try {
      cache.getUnchecked(new Object());
      fail();
    } catch (UncheckedExecutionException expected) {
      assertEquals(cause, expected.getCause());
    }

    Object newValue = new Object();
    valueRef.set(newValue);
    assertSame(newValue, cache.getUnchecked(new Object()));
  }
}




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