package code.google.nfs.rpc.mina2.server;
/**
* nfs-rpc
* Apache License
*
* http://code.google.com/p/nfs-rpc (c) 2011
*/
import java.io.IOException;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.mina.core.future.IoFuture;
import org.apache.mina.core.future.IoFutureListener;
import org.apache.mina.core.future.WriteFuture;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IoSession;
import code.google.nfs.rpc.ProtocolFactory;
import code.google.nfs.rpc.RequestWrapper;
import code.google.nfs.rpc.ResponseWrapper;
/**
* Mina Server Handler to receive message,handle exception
*
* @author <a href="mailto:bluedavy@gmail.com">bluedavy</a>
*/
public class MinaServerHandler extends IoHandlerAdapter {
private static final Log LOGGER = LogFactory.getLog(MinaServerHandler.class);
private ExecutorService threadpool;
public MinaServerHandler(ExecutorService threadpool) {
this.threadpool = threadpool;
}
public void exceptionCaught(IoSession session, Throwable cause)
throws Exception {
if (!(cause instanceof IOException)) {
// only log
LOGGER.error(
"catch some exception not IOException,so close session",
cause);
}
}
public void messageReceived(final IoSession session, final Object message)
throws Exception {
if (!(message instanceof RequestWrapper) && !(message instanceof List)) {
LOGGER.error("receive message error,only support RequestWrapper || List");
throw new Exception(
"receive message error,only support RequestWrapper || List");
}
handleRequest(session,message);
}
@SuppressWarnings("unchecked")
private void handleRequest(final IoSession session, final Object message) {
try {
threadpool.execute(new HandlerRunnable(session, message, threadpool));
}
catch (RejectedExecutionException exception) {
LOGGER.error("server threadpool full,threadpool maxsize is:"
+ ((ThreadPoolExecutor) threadpool).getMaximumPoolSize());
if(message instanceof List){
List<RequestWrapper> requests = (List<RequestWrapper>) message;
for (final RequestWrapper request : requests) {
sendErrorResponse(session, request);
}
}
else{
sendErrorResponse(session, (RequestWrapper) message);
}
}
}
@SuppressWarnings("rawtypes")
private void sendErrorResponse(final IoSession session,final RequestWrapper request) {
ResponseWrapper responseWrapper = new ResponseWrapper(request.getId(),request.getCodecType(),request.getProtocolType());
responseWrapper
.setException(new Exception("server threadpool full,maybe because server is slow or too many requests"));
WriteFuture wf = session.write(responseWrapper);
wf.addListener(new IoFutureListener() {
public void operationComplete(IoFuture future) {
if(!((WriteFuture)future).isWritten()){
LOGGER.error("server write response error,request id is: "+request.getId());
}
}
});
}
class HandlerRunnable implements Runnable{
private IoSession session;
private Object message;
private ExecutorService threadPool;
public HandlerRunnable(IoSession session,Object message,ExecutorService threadPool){
this.session = session;
this.message = message;
this.threadPool = threadPool;
}
@SuppressWarnings("rawtypes")
public void run() {
// pipeline
if(message instanceof List){
List messages = (List) message;
for (Object messageObject : messages) {
threadPool.execute(new HandlerRunnable(session, messageObject, threadPool));
}
}
else{
RequestWrapper request = (RequestWrapper)message;
long beginTime = System.currentTimeMillis();
ResponseWrapper responseWrapper = ProtocolFactory.getServerHandler(request.getProtocolType()).handleRequest(request);
final int id = request.getId();
// already timeout,so not return
if ((System.currentTimeMillis() - beginTime) >= request.getTimeout()) {
LOGGER.warn("timeout,so give up send response to client,requestId is:"
+ id
+ ",client is:"
+ session.getRemoteAddress()+",consumetime is:"+(System.currentTimeMillis() - beginTime)+",timeout is:"+request.getTimeout());
return;
}
WriteFuture wf = session.write(responseWrapper);
wf.addListener(new IoFutureListener() {
public void operationComplete(IoFuture future) {
if(!((WriteFuture)future).isWritten()){
LOGGER.error("server write response error,request id is: "+id);
}
}
});
}
}
}
}