com.sun.xml.ws.api.server.AsyncProvider Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package com.sun.xml.ws.api.server;
import com.sun.istack.NotNull;
import javax.xml.ws.Provider;
import javax.xml.ws.WebServiceContext;
import java.util.concurrent.Executor;
/**
* Asynchronous version of {@link Provider}.
*
*
* Applications that use the JAX-WS RI can implement this interface instead of
* {@link Provider} to implement asynchronous web services (AWS.) AWS enables
* applications to perform operations with long latency without blocking a thread,
* and thus particularly suitable for highly scalable service implementation,
* at the expesnce of implementation complexity.
*
*
Programming Model
*
* Whenever a new reuqest arrives, the JAX-WS RI invokes the {@link #invoke} method
* to notify the application. Normally, the application then schedules an execution
* of this request, and exit from this method immediately (the point of AWS is not
* to use this calling thread for request processing.)
*
*
* Unlike the synchronous version, which requires the response to be given as the return value,
* with AWS the JAX-WS RI will keep the connection with client open, until the application
* eventually notifies the JAX-WS RI via {@link AsyncProviderCallback}. When that
* happens that causes the JAX-WS RI to send back a response to the client.
*
*
* The following code shows a very simple AWS example:
*
*
* @WebService
* class MyAsyncEchoService implements AsyncProvider<Source> {
* private static final {@link Executor} exec = ...;
*
* public void invoke( final Source request, final AsyncProviderCallback<Source> callback, final WebServiceContext context) {
* exec.execute(new {@link Runnable}() {
* public void run() {
* Thread.sleep(1000); // kill time.
* callback.send(request); // just echo back
* }
* });
* }
* }
*
*
*
* Please also check the {@link Provider} and its programming model for general
* provider programming model.
*
*
*
WebServiceContext
*
* In synchronous web services, the injected {@link WebServiceContext} instance uses
* the calling {@link Thread} to determine which request it should return information about.
* This no longer works with AWS, as you may need to call {@link WebServiceContext}
* much later, possibly from entirely different thread.
*
*
* For this reason, {@link AsyncProvider} passes in {@link WebServiceContext} as
* a parameter. This object remains usable until you invoke {@link AsyncProviderCallback},
* and it can be invoked from any thread, even concurrently. AWS must not use the injected
* {@link WebServiceContext}, as its behavior is undefined.
*
* @see Provider
* @author Jitendra Kotamraju
* @author Kohsuke Kawaguchi
* @since 2.1
*/
public interface AsyncProvider {
/**
* Schedules an execution of a request.
*
* @param request
* Represents the request message or payload.
* @param callback
* Application must notify this callback interface when the processing
* of a request is complete.
* @param context
* The web service context instance that can be used to retrieve
* context information about the given request.
*/
public void invoke(
@NotNull T request,
@NotNull AsyncProviderCallback callback,
@NotNull WebServiceContext context);
}