| /* |
| * Copyright (c) 2011 jMonkeyEngine |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * * Neither the name of 'jMonkeyEngine' nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package com.jme3.network.kernel; |
| |
| import java.util.concurrent.ConcurrentLinkedQueue; |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.concurrent.atomic.AtomicLong; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** |
| * Base implementation of the Kernel interface providing several |
| * useful default implementations of some methods. This implementation |
| * assumes that the kernel will be managing its own internal threads |
| * and queuing any results for the caller to retrieve on their own |
| * thread. |
| * |
| * @version $Revision: 8843 $ |
| * @author Paul Speed |
| */ |
| public abstract class AbstractKernel implements Kernel |
| { |
| static Logger log = Logger.getLogger(AbstractKernel.class.getName()); |
| |
| private AtomicLong nextId = new AtomicLong(1); |
| |
| /** |
| * Contains the pending endpoint events waiting for the caller |
| * to retrieve them. |
| */ |
| private ConcurrentLinkedQueue<EndpointEvent> endpointEvents = new ConcurrentLinkedQueue<EndpointEvent>(); |
| |
| /** |
| * Contains the pending envelopes waiting for the caller to |
| * retrieve them. |
| */ |
| private LinkedBlockingQueue<Envelope> envelopes = new LinkedBlockingQueue<Envelope>(); |
| |
| protected AbstractKernel() |
| { |
| } |
| |
| protected void reportError( Exception e ) |
| { |
| // Should really be queued up so the outer thread can |
| // retrieve them. For now we'll just log it. FIXME |
| log.log( Level.SEVERE, "Unhanddled kernel error", e ); |
| } |
| |
| protected long nextEndpointId() |
| { |
| return nextId.getAndIncrement(); |
| } |
| |
| /** |
| * Returns true if there are waiting envelopes. |
| */ |
| public boolean hasEnvelopes() |
| { |
| return !envelopes.isEmpty(); |
| } |
| |
| /** |
| * Removes one envelope from the received messages queue or |
| * blocks until one is available. |
| */ |
| public Envelope read() throws InterruptedException |
| { |
| return envelopes.take(); |
| } |
| |
| /** |
| * Removes and returnsn one endpoint event from the event queue or |
| * null if there are no endpoint events. |
| */ |
| public EndpointEvent nextEvent() |
| { |
| return endpointEvents.poll(); |
| } |
| |
| protected void addEvent( EndpointEvent e ) |
| { |
| endpointEvents.add( e ); |
| } |
| |
| protected void addEnvelope( Envelope env ) |
| { |
| if( !envelopes.offer( env ) ) { |
| throw new KernelException( "Critical error, could not enqueue envelope." ); |
| } |
| } |
| } |