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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * 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 com.google.common.annotations.Beta;
import com.google.common.base.Preconditions;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * A future which forwards all its method calls to another future. Subclasses
 * should override one or more methods to modify the behavior of the backing 
 * future as desired per the decorator pattern.
 *
 * Most subclasses can simply extend {@link SimpleForwardingCheckedFuture}.
 * 
 * @param  The result type returned by this Future's {@code get} method
 * @param  The type of the Exception thrown by the Future's 
 *            {@code checkedGet} method
 *
 * @author Anthony Zana
 * @since 9.0
 */
@Beta
public abstract class ForwardingCheckedFuture 
    extends ForwardingListenableFuture implements CheckedFuture {

  @Override
  public V checkedGet() throws X {
    return delegate().checkedGet();
  }

  @Override
  public V checkedGet(long timeout, TimeUnit unit) throws TimeoutException, X {
    return delegate().checkedGet(timeout, unit);
  }

  @Override
  protected abstract CheckedFuture delegate();

  // TODO(cpovirk): Use Standard Javadoc form for SimpleForwarding*
  /**
   * A simplified version of {@link ForwardingCheckedFuture} where subclasses
   * can pass in an already constructed {@link CheckedFuture} as the delegate.
   * 
   * @since 9.0
   */
  @Beta
  public abstract static class SimpleForwardingCheckedFuture<
      V, X extends Exception> extends ForwardingCheckedFuture {
    private final CheckedFuture delegate;

    protected SimpleForwardingCheckedFuture(CheckedFuture delegate) {
      this.delegate = Preconditions.checkNotNull(delegate);
    }

    @Override
    protected final CheckedFuture delegate() {
      return delegate;
    }
  }
}