org.jboss.remotingjmx.protocol.v2.ServerCommon Maven / Gradle / Ivy
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* JBoss, Home of Professional Open Source.
* Copyright 2012, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.remotingjmx.protocol.v2;
import static org.jboss.remotingjmx.protocol.v2.Constants.EXCEPTION;
import static org.jboss.remotingjmx.protocol.v2.Constants.FAILURE;
import static org.jboss.remotingjmx.protocol.v2.Constants.RESPONSE_MASK;
import static org.jboss.remotingjmx.protocol.v2.Constants.STRING;
import static org.jboss.remotingjmx.protocol.v2.Constants.SUCCESS;
import java.io.DataInputStream;
import java.io.DataOutput;
import java.io.IOException;
import java.util.concurrent.Executor;
import javax.management.JMRuntimeException;
import org.jboss.logging.Logger;
import org.jboss.marshalling.Marshaller;
import org.jboss.remoting3.Channel;
import org.jboss.remoting3.MessageInputStream;
import org.jboss.remotingjmx.ServerMessageInterceptor;
import org.jboss.remotingjmx.ServerMessageInterceptor.Event;
import org.xnio.IoUtils;
/**
* An extension of Common to hold anything common to both ParameterProxy and ServerProxy but not ClientConnection.
*
* @author Darran Lofthouse
*/
public abstract class ServerCommon extends Common {
private static final Logger log = Logger.getLogger(ServerCommon.class);
private final Executor executor;
private final ServerMessageInterceptor serverMessageInterceptor;
ServerCommon(Channel channel, Executor executor, ServerMessageInterceptor serverMessageInterceptor) {
super(channel);
this.executor = executor;
this.serverMessageInterceptor = serverMessageInterceptor;
}
protected void sendWelcomeMessage() throws IOException {
write(new MessageWriter() {
@Override
public void write(DataOutput output) throws IOException {
output.writeBytes("JMX");
}
});
log.tracef("Written welcome message");
}
protected void writeResponse(final Exception e, final byte inResponseTo, final int correlationId) throws IOException {
write(new MessageWriter() {
@Override
public void write(DataOutput output) throws IOException {
output.writeByte(inResponseTo ^ RESPONSE_MASK);
output.writeInt(correlationId);
output.writeByte(FAILURE);
output.writeByte(EXCEPTION);
Marshaller marshaller = prepareForMarshalling(output);
marshaller.writeObject(e);
marshaller.finish();
}
});
}
protected void writeResponse(final byte inResponseTo, final int correlationId) throws IOException {
write(new MessageWriter() {
@Override
public void write(DataOutput output) throws IOException {
output.writeByte(inResponseTo ^ RESPONSE_MASK);
output.writeInt(correlationId);
output.writeByte(SUCCESS);
}
});
}
protected void writeResponse(final String response, final byte inResponseTo, final int correlationId) throws IOException {
write(new MessageWriter() {
@Override
public void write(DataOutput output) throws IOException {
output.writeByte(inResponseTo ^ RESPONSE_MASK);
output.writeInt(correlationId);
output.writeByte(SUCCESS);
output.writeByte(STRING);
output.writeUTF(response);
}
});
}
abstract void end();
abstract class MessageHandler implements Common.MessageHandler {
boolean endReceiveLoop() {
return false;
}
}
protected class MessageReciever implements Channel.Receiver {
@Override
public void handleMessage(final Channel channel, MessageInputStream message) {
final DataInputStream dis = new DataInputStream(message);
boolean endReceiveLoop = false;
try {
final byte messageId = dis.readByte();
final int correlationId = dis.readInt();
log.tracef("Message Received id(%h), correlationId(%d)", messageId, correlationId);
final Common.MessageHandler mh = getHandlerRegistry().get(messageId);
if (mh instanceof MessageHandler) {
endReceiveLoop = ((MessageHandler) mh).endReceiveLoop();
}
if (mh != null) {
executor.execute(new Runnable() {
@Override
public void run() {
try {
serverMessageInterceptor.handleEvent(new Event() {
@Override
public void run() throws IOException {
mh.handle(dis, correlationId);
}
});
} catch (Throwable t) {
if (correlationId != 0x00) {
Exception response;
if (t instanceof IOException) {
response = (Exception) t;
} else if (t instanceof JMRuntimeException) {
response = (Exception) t;
} else {
response = new IOException("Internal server error.");
log.warn("Unexpected internal error", t);
}
sendIOException(response);
} else {
log.error("null correlationId so error not sent to client", t);
}
} finally {
IoUtils.safeClose(dis);
}
}
private void sendIOException(final Exception e) {
try {
writeResponse(e, messageId, correlationId);
log.tracef("[%d] %h - Success Response Sent", correlationId, messageId);
} catch (IOException ioe) {
// Here there is nothing left we can do, we know we can not sent to the client though.
log.error(ioe);
}
}
});
} else {
throw new IOException("Unrecognised Message ID");
}
} catch (IOException e) {
log.error(e);
IoUtils.safeClose(dis);
} finally {
if (endReceiveLoop == false) {
channel.receiveMessage(this);
}
}
}
public void handleError(Channel channel, IOException error) {
log.warn("Channel closing due to error", error);
end();
}
@Override
public void handleEnd(Channel channel) {
end();
}
}
}
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