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Apache CXF JAX-RS Client
There is a newer version: 4.1.0
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.cxf.jaxrs.client;

import java.lang.reflect.Type;
import java.util.Map;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import javax.ws.rs.client.InvocationCallback;

import org.apache.cxf.endpoint.ClientCallback;

public class JaxrsClientCallback extends ClientCallback {
    private final InvocationCallback handler;
    private final Type outType;
    private final Class responseClass;

    public JaxrsClientCallback(final InvocationCallback handler,
                        Class responseClass,
                        Type outGenericType) {
        this.handler = handler;
        this.outType = outGenericType;
        this.responseClass = responseClass;
    }

    public InvocationCallback getHandler() {
        return handler;
    }

    public Type getOutGenericType() {
        return outType;
    }
    public Class getResponseClass() {
        return responseClass;
    }

    @Override
    public boolean cancel(boolean mayInterruptIfRunning) {
        if (!started) {
            // The handler has to be called *before* future completes
            if (handler != null) {
                handler.failed(new CancellationException());
            }
            
            delegate.cancel(mayInterruptIfRunning);
            synchronized (this) {
                notifyAll();
            }
            
            return true;
        }

        return false;
    }

    public Future createFuture() {
        return new JaxrsResponseFuture(this);
    }

    @SuppressWarnings("unchecked")
    public void handleResponse(Map ctx, Object[] res) {
        context = ctx;
        
        // The handler has to be called *before* future completes
        if (handler != null) {
            handler.completed((T)res[0]);
        }
        
        delegate.complete(res);
        synchronized (this) {
            notifyAll();
        }
    }

    @Override
    public void handleException(Map ctx, final Throwable ex) {
        context = ctx;

        // The handler has to be called *before* future completes
        if (handler != null) {
            handler.failed(ex);
        }

        delegate.completeExceptionally(ex);
        synchronized (this) {
            notifyAll();
        }
    }



    static class JaxrsResponseFuture implements Future {
        JaxrsClientCallback callback;
        JaxrsResponseFuture(JaxrsClientCallback cb) {
            callback = cb;
        }

        public Map getContext() {
            try {
                return callback.getResponseContext();
            } catch (Exception ex) {
                return null;
            }
        }
        public boolean cancel(boolean mayInterruptIfRunning) {
            return callback.cancel(mayInterruptIfRunning);
        }

        public T get() throws InterruptedException, ExecutionException {
            try {
                return getObject(callback.get()[0]);
            } catch (InterruptedException ex) {
                if (callback.handler != null) {
                    callback.handler.failed(ex);
                }
                throw ex;
            }
        }
        public T get(long timeout, TimeUnit unit) throws InterruptedException,
            ExecutionException, TimeoutException {
            try {
                return getObject(callback.get(timeout, unit)[0]);
            } catch (InterruptedException ex) {
                if (callback.handler != null) {
                    callback.handler.failed(ex);
                }
                throw ex;
            }
        }

        @SuppressWarnings("unchecked")
        private T getObject(Object object) {
            return (T)object;
        }

        public boolean isCancelled() {
            return callback.isCancelled();
        }
        public boolean isDone() {
            return callback.isDone();
        }
    }
}