import org.jboss.netty.channel.Channel; //導入方法依賴的package包/類

protected void doConnect() throws Throwable {

long start = System.currentTimeMillis();

ChannelFuture future = bootstrap.connect(getConnectAddress());

try{

boolean ret = future.awaitUninterruptibly(getConnectTimeout(), TimeUnit.MILLISECONDS);

if (ret && future.isSuccess()) {

Channel newChannel = future.getChannel();

newChannel.setInterestOps(Channel.OP_READ_WRITE);

try {

// 關閉舊的連接

Channel oldChannel = NettyClient.this.channel; // copy reference

if (oldChannel != null) {

try {

if (logger.isInfoEnabled()) {

logger.info("Close old netty channel " + oldChannel + " on create new netty channel " + newChannel);

}

oldChannel.close();

} finally {

NettyChannel.removeChannelIfDisconnected(oldChannel);

}

}

} finally {

if (NettyClient.this.isClosed()) {

try {

if (logger.isInfoEnabled()) {

logger.info("Close new netty channel " + newChannel + ", because the client closed.");

}

newChannel.close();

} finally {

NettyClient.this.channel = null;

NettyChannel.removeChannelIfDisconnected(newChannel);

}

} else {

NettyClient.this.channel = newChannel;

}

}

} else if (future.getCause() != null) {

throw new RemotingException(this, "client(url: " + getUrl() + ") failed to connect to server "

+ getRemoteAddress() + ", error message is:" + future.getCause().getMessage(), future.getCause());

} else {

throw new RemotingException(this, "client(url: " + getUrl() + ") failed to connect to server "

+ getRemoteAddress() + " client-side timeout "

+ getConnectTimeout() + "ms (elapsed: " + (System.currentTimeMillis() - start) + "ms) from netty client "

+ NetUtils.getLocalHost() + " using dubbo version " + Version.getVersion());

}

}finally{

if (! isConnected()) {

future.cancel();

}

}

}

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