forked from apache/dubbo
/
LazyConnectExchangeClient.java
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/
LazyConnectExchangeClient.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 com.alibaba.dubbo.rpc.protocol.dubbo;
import com.alibaba.dubbo.common.Constants;
import com.alibaba.dubbo.common.Parameters;
import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.common.logger.Logger;
import com.alibaba.dubbo.common.logger.LoggerFactory;
import com.alibaba.dubbo.common.utils.NetUtils;
import com.alibaba.dubbo.remoting.ChannelHandler;
import com.alibaba.dubbo.remoting.RemotingException;
import com.alibaba.dubbo.remoting.exchange.ExchangeClient;
import com.alibaba.dubbo.remoting.exchange.ExchangeHandler;
import com.alibaba.dubbo.remoting.exchange.Exchangers;
import com.alibaba.dubbo.remoting.exchange.ResponseFuture;
import java.net.InetSocketAddress;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
* dubbo protocol support class.
*/
@SuppressWarnings("deprecation")
final class LazyConnectExchangeClient implements ExchangeClient {
// when this warning rises from invocation, program probably have bug.
static final String REQUEST_WITH_WARNING_KEY = "lazyclient_request_with_warning";
private final static Logger logger = LoggerFactory.getLogger(LazyConnectExchangeClient.class);
protected final boolean requestWithWarning;
private final URL url;
private final ExchangeHandler requestHandler;
private final Lock connectLock = new ReentrantLock();
// lazy connect, initial state for connection
private final boolean initialState;
private volatile ExchangeClient client;
private AtomicLong warningcount = new AtomicLong(0);
public LazyConnectExchangeClient(URL url, ExchangeHandler requestHandler) {
// lazy connect, need set send.reconnect = true, to avoid channel bad status.
this.url = url.addParameter(Constants.SEND_RECONNECT_KEY, Boolean.TRUE.toString());
this.requestHandler = requestHandler;
this.initialState = url.getParameter(Constants.LAZY_CONNECT_INITIAL_STATE_KEY, Constants.DEFAULT_LAZY_CONNECT_INITIAL_STATE);
this.requestWithWarning = url.getParameter(REQUEST_WITH_WARNING_KEY, false);
}
private void initClient() throws RemotingException {
if (client != null) {
return;
}
if (logger.isInfoEnabled()) {
logger.info("Lazy connect to " + url);
}
connectLock.lock();
try {
if (client != null) {
return;
}
this.client = Exchangers.connect(url, requestHandler);
} finally {
connectLock.unlock();
}
}
@Override
public ResponseFuture request(Object request) throws RemotingException {
warning(request);
initClient();
return client.request(request);
}
@Override
public URL getUrl() {
return url;
}
@Override
public InetSocketAddress getRemoteAddress() {
if (client == null) {
return InetSocketAddress.createUnresolved(url.getHost(), url.getPort());
} else {
return client.getRemoteAddress();
}
}
@Override
public ResponseFuture request(Object request, int timeout) throws RemotingException {
warning(request);
initClient();
return client.request(request, timeout);
}
/**
* If {@link #REQUEST_WITH_WARNING_KEY} is configured, then warn once every 5000 invocations.
*
* @param request
*/
private void warning(Object request) {
if (requestWithWarning) {
if (warningcount.get() % 5000 == 0) {
logger.warn(url.getAddress() + " " + url.getServiceKey() + " safe guard client get called after real client closed, recreating connection...");
}
warningcount.incrementAndGet();
}
}
@Override
public ChannelHandler getChannelHandler() {
checkClient();
return client.getChannelHandler();
}
@Override
public boolean isConnected() {
if (client == null) {
return initialState;
} else {
return client.isConnected();
}
}
@Override
public InetSocketAddress getLocalAddress() {
if (client == null) {
return InetSocketAddress.createUnresolved(NetUtils.getLocalHost(), 0);
} else {
return client.getLocalAddress();
}
}
@Override
public ExchangeHandler getExchangeHandler() {
return requestHandler;
}
@Override
public void send(Object message) throws RemotingException {
initClient();
client.send(message);
}
@Override
public void send(Object message, boolean sent) throws RemotingException {
initClient();
client.send(message, sent);
}
@Override
public boolean isClosed() {
return (null != client) ? client.isClosed() : false;
}
@Override
public void close() {
if (client != null) {
client.close();
}
}
@Override
public void close(int timeout) {
if (client != null) {
client.close(timeout);
}
}
@Override
public void startClose() {
if (client != null) {
client.startClose();
}
}
@Override
public void reset(URL url) {
checkClient();
client.reset(url);
}
@Override
@Deprecated
public void reset(Parameters parameters) {
reset(getUrl().addParameters(parameters.getParameters()));
}
@Override
public void reconnect() throws RemotingException {
checkClient();
client.reconnect();
}
@Override
public Object getAttribute(String key) {
if (client == null) {
return null;
} else {
return client.getAttribute(key);
}
}
@Override
public void setAttribute(String key, Object value) {
checkClient();
client.setAttribute(key, value);
}
@Override
public void removeAttribute(String key) {
checkClient();
client.removeAttribute(key);
}
@Override
public boolean hasAttribute(String key) {
if (client == null) {
return false;
} else {
return client.hasAttribute(key);
}
}
private void checkClient() {
if (client == null) {
throw new IllegalStateException(
"LazyConnectExchangeClient state error. the client has not be init .url:" + url);
}
}
}