/**
*Copyright [2009-2010] [dennis zhuang(killme2008@gmail.com)]
*Licensed under the Apache License, Version 2.0 (the "License");
*you may not use this file except in compliance with the License.
*You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*Unless required by applicable law or agreed to in writing,
*software distributed under the License is distributed on an "AS IS" BASIS,
*WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
*either express or implied. See the License for the specific language governing permissions and limitations under the License
*/
package net.rubyeye.xmemcached.impl;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.SocketException;
import java.nio.channels.SocketChannel;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicReference;
import net.rubyeye.xmemcached.CommandFactory;
import net.rubyeye.xmemcached.MemcachedOptimizer;
import net.rubyeye.xmemcached.buffer.BufferAllocator;
import net.rubyeye.xmemcached.command.Command;
import net.rubyeye.xmemcached.command.OperationStatus;
import net.rubyeye.xmemcached.exception.MemcachedException;
import net.rubyeye.xmemcached.networking.MemcachedSession;
import net.rubyeye.xmemcached.utils.InetSocketAddressWrapper;
import com.google.code.yanf4j.core.WriteMessage;
import com.google.code.yanf4j.core.impl.FutureImpl;
import com.google.code.yanf4j.nio.NioSessionConfig;
import com.google.code.yanf4j.nio.impl.NioTCPSession;
import com.google.code.yanf4j.util.LinkedTransferQueue;
import com.google.code.yanf4j.util.SystemUtils;
/**
* Connected session for a memcached server
*
* @author dennis
*/
public class MemcachedTCPSession extends NioTCPSession implements
MemcachedSession {
/**
* Command which are already sent
*/
protected BlockingQueue<Command> commandAlreadySent;
private final AtomicReference<Command> currentCommand = new LinkedTransferQueue.PaddedAtomicReference<Command>(null);
private SocketAddress remoteSocketAddress; // prevent channel is closed
private int sendBufferSize;
private final MemcachedOptimizer optimiezer;
private volatile boolean allowReconnect;
private volatile boolean authFailed;
private final CommandFactory commandFactory;
private InetSocketAddressWrapper inetSocketAddressWrapper;
public MemcachedTCPSession(NioSessionConfig sessionConfig,
int readRecvBufferSize, MemcachedOptimizer optimiezer,
int readThreadCount, CommandFactory commandFactory) {
super(sessionConfig, readRecvBufferSize);
this.optimiezer = optimiezer;
if (this.selectableChannel != null) {
this.remoteSocketAddress = ((SocketChannel) this.selectableChannel)
.socket().getRemoteSocketAddress();
this.allowReconnect = true;
try {
this.sendBufferSize = ((SocketChannel) this.selectableChannel)
.socket().getSendBufferSize();
} catch (SocketException e) {
this.sendBufferSize = 8 * 1024;
}
}
this.commandAlreadySent = (BlockingQueue<Command>)SystemUtils.createTransferQueue();
this.commandFactory = commandFactory;
}
public InetSocketAddressWrapper getInetSocketAddressWrapper() {
return this.inetSocketAddressWrapper;
}
public int getOrder() {
return this.getInetSocketAddressWrapper().getOrder();
}
public int getWeight() {
return this.getInetSocketAddressWrapper().getWeight();
}
public void setInetSocketAddressWrapper(
InetSocketAddressWrapper inetSocketAddressWrapper) {
this.inetSocketAddressWrapper = inetSocketAddressWrapper;
}
@Override
public String toString() {
return SystemUtils.getRawAddress(this.getRemoteSocketAddress()) + ":"
+ this.getRemoteSocketAddress().getPort();
}
public void destroy() {
Command command = this.currentCommand.get();
if (command != null) {
command.setException(new MemcachedException(
"Session has been closed"));
CountDownLatch latch = command.getLatch();
if (latch != null) {
latch.countDown();
}
}
while ((command = this.commandAlreadySent.poll()) != null) {
command.setException(new MemcachedException(
"Session has been closed"));
CountDownLatch latch = command.getLatch();
if (latch != null) {
latch.countDown();
}
}
}
@Override
public InetSocketAddress getRemoteSocketAddress() {
InetSocketAddress result = super.getRemoteSocketAddress();
if (result == null && this.remoteSocketAddress != null) {
result = (InetSocketAddress) this.remoteSocketAddress;
}
return result;
}
@Override
protected WriteMessage preprocessWriteMessage(WriteMessage writeMessage) {
Command currentCommand = (Command) writeMessage;
// Check if IoBuffer is null
if (currentCommand.getIoBuffer() == null) {
currentCommand.encode();
}
if (currentCommand.getStatus() == OperationStatus.SENDING) {
/**
* optimieze commands
*/
currentCommand = this.optimiezer.optimize(currentCommand,
this.writeQueue, this.commandAlreadySent,
this.sendBufferSize);
}
currentCommand.setStatus(OperationStatus.WRITING);
return currentCommand;
}
public boolean isAuthFailed() {
return this.authFailed;
}
public void setAuthFailed(boolean authFailed) {
this.authFailed = authFailed;
}
private BufferAllocator bufferAllocator;
public final BufferAllocator getBufferAllocator() {
return this.bufferAllocator;
}
public final void setBufferAllocator(BufferAllocator bufferAllocator) {
this.bufferAllocator = bufferAllocator;
}
@Override
protected final WriteMessage wrapMessage(Object msg,
Future<Boolean> writeFuture) {
((Command) msg).encode();
((Command) msg).setWriteFuture((FutureImpl<Boolean>) writeFuture);
if (log.isDebugEnabled()) {
log.debug("After encoding" + ((Command) msg).toString());
}
return (WriteMessage) msg;
}
/**
* get current command from queue
*
* @return
*/
private Command takeExecutingCommand() {
try {
return this.commandAlreadySent.take();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
return null;
}
/**
* is allow auto recconect if closed?
*
* @return
*/
public boolean isAllowReconnect() {
return this.allowReconnect;
}
public void setAllowReconnect(boolean reconnected) {
this.allowReconnect = reconnected;
}
public void addCommand(Command command) {
this.commandAlreadySent.add(command);
}
public void setCurrentCommand(Command cmd) {
this.currentCommand.set(cmd);
}
public Command getCurrentCommand() {
return this.currentCommand.get();
}
public void takeCurrentCommand() {
this.setCurrentCommand(this.takeExecutingCommand());
}
public void quit() {
this.write(this.commandFactory.createQuitCommand());
}
}