java httpclient单例_java-8 – CloseableHttpClient.execute每隔几周就会冻结一次,尽管超时...
我们有一个groovy单例,使用PoolingHttpClientConnectionManager(httpclient：4.3.6),池大小为200,以处理与搜索服务非常高的并发连接并处理xml响应.
尽管已经指定了超时,但它每个月冻结约一次,但在其余时间内运行良好.
下面的groovy单身.方法retrieveInputFromURL似乎阻止在client.execute(get);
@Singleton(strict=false)
class StreamManagerUtil {
// Instantiate once and cache for lifetime of Signleton class
private static PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager();
private static CloseableHttpClient client;
private static final IdleConnectionMonitorThread staleMonitor = new IdleConnectionMonitorThread(connManager);
private int warningLimit;
private int readTimeout;
private int connectionTimeout;
private int connectionFetchTimeout;
private int poolSize;
private int routeSize;
PropertyManager propertyManager = PropertyManagerFactory.getInstance().getPropertyManager("sebe.properties")
StreamManagerUtil() {
// Initialize all instance variables in singleton from properties file
readTimeout = 6
connectionTimeout = 6
connectionFetchTimeout =6
// Pooling
poolSize = 200
routeSize = 50
// Connection pool size and number of routes to cache
connManager.setMaxTotal(poolSize);
connManager.setDefaultMaxPerRoute(routeSize);
// ConnectTimeout : time to establish connection with GSA
// ConnectionRequestTimeout : time to get connection from pool
// SocketTimeout : waiting for packets form GSA
RequestConfig config = RequestConfig.custom()
.setConnectTimeout(connectionTimeout * 1000)
.setConnectionRequestTimeout(connectionFetchTimeout * 1000)
.setSocketTimeout(readTimeout * 1000).build();
// Keep alive for 5 seconds if server does not have keep alive header
ConnectionKeepAliveStrategy myStrategy = new ConnectionKeepAliveStrategy() {
@Override
public long getKeepAliveDuration(HttpResponse response, HttpContext context) {
HeaderElementIterator it = new BasicHeaderElementIterator
(response.headerIterator(HTTP.CONN_KEEP_ALIVE));
while (it.hasNext()) {
HeaderElement he = it.nextElement();
String param = he.getName();
String value = he.getValue();
if (value != null && param.equalsIgnoreCase
("timeout")) {
return Long.parseLong(value) * 1000;
}
}
return 5 * 1000;
}
};
// Close all connection older than 5 seconds. Run as separate thread.
staleMonitor.start();
staleMonitor.join(1000);
client = HttpClients.custom().setDefaultRequestConfig(config).setKeepAliveStrategy(myStrategy).setConnectionManager(connManager).build();
}
private retrieveInputFromURL (String categoryUrl, String xForwFor, boolean isXml) throws Exception {
URL url = new URL( categoryUrl );
GPathResult searchResponse = null
InputStream inputStream = null
HttpResponse response;
HttpGet get;
try {
long startTime = System.nanoTime();
get = new HttpGet(categoryUrl);
response = client.execute(get);
int resCode = response.getStatusLine().getStatusCode();
if (xForwFor != null) {
get.setHeader("X-Forwarded-For", xForwFor)
}
if (resCode == HttpStatus.SC_OK) {
if (isXml) {
extractXmlString(response)
} else {
StringBuffer buffer = buildStringFromResponse(response)
return buffer.toString();
}
}
}
catch (Exception e)
{
throw e;
}
finally {
// Release connection back to pool
if (response != null) {
EntityUtils.consume(response.getEntity());
}
}
}
private extractXmlString(HttpResponse response) {
InputStream inputStream = response.getEntity().getContent()
XmlSlurper slurper = new XmlSlurper()
slurper.setFeature("http://xml.org/sax/features/validation", false)
slurper.setFeature("http://apache.org/xml/features/disallow-doctype-decl", false)
slurper.setFeature("http://apache.org/xml/features/nonvalidating/load-dtd-grammar", false)
slurper.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false)
return slurper.parse(inputStream)
}
private StringBuffer buildStringFromResponse(HttpResponse response) {
StringBuffer buffer= new StringBuffer();
BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
String line = "";
while ((line = rd.readLine()) != null) {
buffer.append(line);
System.out.println(line);
}
return buffer
}
public class IdleConnectionMonitorThread extends Thread {
private final HttpClientConnectionManager connMgr;
private volatile boolean shutdown;
public IdleConnectionMonitorThread
(PoolingHttpClientConnectionManager connMgr) {
super();
this.connMgr = connMgr;
}
@Override
public void run() {
try {
while (!shutdown) {
synchronized (this) {
wait(5000);
connMgr.closeExpiredConnections();
connMgr.closeIdleConnections(10, TimeUnit.SECONDS);
}
}
} catch (InterruptedException ex) {
// Ignore
}
}
public void shutdown() {
shutdown = true;
synchronized (this) {
notifyAll();
}
}
}
我还发现在日志中发现这一点,导致我相信它在等待响应数据时发生
java.net.SocketTimeoutException：通过java.net.SocketInputStream.read(SocketInputStream.java:150)在java.net.SocketInputStream.read(SocketInputStream.java:121)上的java.net.SocketInputStream.socketRead0(Native Method)读取超时)在sun.security.ssl.InputRecord.readFully(InputRecord.java:465)
到目前为止的调查结果：
问题
>这可能是同步问题吗？从我的理解,即使单线程被多个线程访问,唯一的共享数据是缓存的CloseableHttpClient
>这个代码有什么其他根本的错误,可能导致这种行为的方法？