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package org.glassfish.jersey.examples.server.async;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.Consumes;
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;
import javax.ws.rs.core.MediaType;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
/**
* Example of a simple fire&forget point-to-point messaging resource.
*
* This version of the messaging resource does not block when POSTing a new message.
*
* @author Marek Potociar (marek.potociar at oracle.com)
*/
@Path(App.ASYNC_MESSAGING_FIRE_N_FORGET_PATH)
@Produces(MediaType.TEXT_PLAIN)
@Consumes(MediaType.TEXT_PLAIN)
public class FireAndForgetChatResource {
public static final String POST_NOTIFICATION_RESPONSE = "Message sent";
//
private static final Logger LOGGER = Logger.getLogger(FireAndForgetChatResource.class.getName());
private static final Level DEBUG = Level.INFO;
//
private static final ExecutorService QUEUE_EXECUTOR = Executors.newCachedThreadPool(
new ThreadFactoryBuilder().setNameFormat("fire&forget-chat-resource-executor-%d").build());
private static final BlockingQueue<AsyncResponse> suspended = new ArrayBlockingQueue<AsyncResponse>(5);
@GET
public void pickUpMessage(@Suspended final AsyncResponse ar, @QueryParam("id") final String messageId)
throws InterruptedException {
LOGGER.log(DEBUG, "Received GET <{0}> with context {1} on thread {2}.",
new Object[] {messageId, ar.toString(), Thread.currentThread().getName()});
QUEUE_EXECUTOR.submit(new Runnable() {
@Override
public void run() {
try {
suspended.put(ar);
LOGGER.log(DEBUG, "GET <{0}> context {1} scheduled for resume.",
new Object[] {messageId, ar.toString()});
} catch (InterruptedException ex) {
LOGGER.log(Level.SEVERE,
"Waiting for a message pick-up interrupted. Cancelling context" + ar.toString(), ex);
ar.cancel(); // close the open connection
}
}
});
}
@POST
public String postMessage(final String message) throws InterruptedException {
LOGGER.log(DEBUG, "Received POSTed message <{0}> on thread {1}.",
new Object[] {message, Thread.currentThread().getName()});
QUEUE_EXECUTOR.submit(new Runnable() {
@Override
public void run() {
try {
final AsyncResponse suspendedResponse = suspended.take();
LOGGER.log(DEBUG, "Resuming GET context {0} with a message <{1}> on thread {2}.",
new Object[] {suspendedResponse.toString(), message, Thread.currentThread().getName()});
suspendedResponse.resume(message);
} catch (InterruptedException ex) {
LOGGER.log(Level.SEVERE,
"Waiting for a sending a message <" + message + "> has been interrupted.", ex);
}
}
});
return POST_NOTIFICATION_RESPONSE;
}
}