com.yuweix.kuafu.http.strategy.retry.NeedRetryHandler Maven / Gradle / Ivy
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package com.yuweix.kuafu.http.strategy.retry;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.UnknownHostException;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import javax.net.ssl.SSLException;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpRequest;
import org.apache.http.client.HttpRequestRetryHandler;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.protocol.HttpContext;
/**
* 异常恢复机制 连接失败后，可以针对相应的异常进行相应的处理措施；
* @author yuwei
*/
public class NeedRetryHandler implements HttpRequestRetryHandler {
private static volatile NeedRetryHandler instance = null;
private static final Lock lock = new ReentrantLock();
private NeedRetryHandler() {
}
public static NeedRetryHandler get() {
if (instance == null) {
lock.lock();
try {
if (instance == null) {
instance = new NeedRetryHandler();
}
} finally {
lock.unlock();
}
}
return instance;
}
@Override
public boolean retryRequest(IOException exception, int executionCount, HttpContext context) {
/**
* 如果连接次数超过5次，就不进行重复连接
*/
if (executionCount >= 5) {
return false;
}
/**
* 连接超时
*/
if (exception instanceof ConnectTimeoutException) {
return true;
}
/**
* io操作中断
*/
if (exception instanceof InterruptedIOException) {
return false;
}
/**
* 未找到主机
*/
if (exception instanceof UnknownHostException) {
return false;
}
/**
* SSL handshake exception
*/
if (exception instanceof SSLException) {
return false;
}
HttpClientContext clientContext = HttpClientContext.adapt(context);
HttpRequest request = clientContext.getRequest();
boolean idempotent = !(request instanceof HttpEntityEnclosingRequest);
/**
* Retry if the request is considered idempotent
*/
if (idempotent) {
return true;
}
return false;
}
}