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Apache CXF JAX-RS Extensions: RxJava

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/**
 * 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.rx.server;

import org.apache.cxf.jaxrs.JAXRSInvoker;
import org.apache.cxf.jaxrs.impl.AsyncResponseImpl;
import org.apache.cxf.message.Message;
import rx.Observable;

public class ObservableInvoker extends JAXRSInvoker {
    protected AsyncResponseImpl checkFutureResponse(Message inMessage, Object result) {
        if (result instanceof Observable) {
            final Observable obs = (Observable)result;
            final AsyncResponseImpl asyncResponse = new AsyncResponseImpl(inMessage);
            obs.subscribe(v -> asyncResponse.resume(v), t -> handleThrowable(asyncResponse, t));
            return asyncResponse;
        }
        return null;
    }

    private Object handleThrowable(AsyncResponseImpl asyncResponse, Throwable t) {
        //TODO: if it is a Cancelation exception => asyncResponse.cancel(); 
        asyncResponse.resume(t);
        return null;
    }
}