1 files changed, 122 insertions, 0 deletions
diff --git a/engine/src/networking/com/jme3/network/kernel/AbstractKernel.java b/engine/src/networking/com/jme3/network/kernel/AbstractKernel.java
new file mode 100644
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+++ b/engine/src/networking/com/jme3/network/kernel/AbstractKernel.java
@@ -0,0 +1,122 @@
+/*
+ * 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." );
+        }            
+    }
+}