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package org.glassfish.jersey.tests.integration.servlet_3_async;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Executors;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.container.AsyncResponse;
import javax.ws.rs.container.Suspended;
/**
* Asynchronous servlet-deployed resource.
*
* @author Marek Potociar (marek.potociar at oracle.com)
*/
@Path("async")
public class AsyncServletResource {
/**
* Hello world message.
*/
public static final String HELLO_ASYNC_WORLD = "Hello Async World!";
public static final String CANCELED = "Canceled";
private static BlockingQueue<CanceledRequest> cancelingQueue = new ArrayBlockingQueue<CanceledRequest>(5);
private static class CanceledRequest {
private final String id;
private final AsyncResponse asyncResponse;
private CanceledRequest(final String id, final AsyncResponse asyncResponse) {
this.id = id;
this.asyncResponse = asyncResponse;
}
}
/**
* Get the async "Hello World" message.
*/
@GET
@Produces("text/plain")
public void get(@Suspended final AsyncResponse ar) {
Executors.newSingleThreadExecutor().execute(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(100);
ar.resume(HELLO_ASYNC_WORLD);
} catch (final InterruptedException e) {
e.printStackTrace();
}
}
});
}
/**
* Get a canceled request.
*
* @param id request id.
* @throws InterruptedException in case of not being able to put the request
* to an internal queue for canceling.
*/
@GET
@Path("canceled")
public void getCanceled(@Suspended final AsyncResponse ar, @QueryParam("id") final String id) throws InterruptedException {
cancelingQueue.put(new CanceledRequest(id, ar));
}
/**
* Cancel a request that is on top of the canceling queue.
*
* @return notification message about successful request canceling.
* @throws InterruptedException in case of not being able to take a cancelled request
* from an internal canceling queue.
*/
@POST
@Produces("text/plain")
@Path("canceled")
public String cancel(final String requestId) throws InterruptedException {
final CanceledRequest canceledRequest = cancelingQueue.take();
canceledRequest.asyncResponse.cancel();
return CANCELED + " " + canceledRequest.id + " by POST " + requestId;
}
}