/**
* Executes a method with the current hostConfiguration.
*
* @throws IOException if an I/O (transport) error occurs. Some transport exceptions can be
* recovered from.
* @throws HttpException if a protocol exception occurs. Usually protocol exceptions cannot be
* recovered from.
*/
private void executeWithRetry(final HttpMethod method) throws IOException, HttpException {
/** How many times did this transparently handle a recoverable exception? */
int execCount = 0;
// loop until the method is successfully processed, the retryHandler
// returns false or a non-recoverable exception is thrown
try {
while (true) {
execCount++;
try {
if (LOG.isTraceEnabled()) {
LOG.trace("Attempt number " + execCount + " to process request");
}
if (this.conn.getParams().isStaleCheckingEnabled()) {
this.conn.closeIfStale();
}
if (!this.conn.isOpen()) {
// this connection must be opened before it can be used
// This has nothing to do with opening a secure tunnel
this.conn.open();
if (this.conn.isProxied()
&& this.conn.isSecure()
&& !(method instanceof ConnectMethod)) {
// we need to create a secure tunnel before we can execute the real method
if (!executeConnect()) {
// abort, the connect method failed
return;
}
}
}
applyConnectionParams(method);
method.execute(state, this.conn);
break;
} catch (HttpException e) {
// filter out protocol exceptions which cannot be recovered from
throw e;
} catch (IOException e) {
LOG.debug("Closing the connection.");
this.conn.close();
// test if this method should be retried
// ========================================
// this code is provided for backward compatibility with 2.0
// will be removed in the next major release
if (method instanceof HttpMethodBase) {
MethodRetryHandler handler = ((HttpMethodBase) method).getMethodRetryHandler();
if (handler != null) {
if (!handler.retryMethod(
method,
this.conn,
new HttpRecoverableException(e.getMessage()),
execCount,
method.isRequestSent())) {
LOG.debug(
"Method retry handler returned false. "
+ "Automatic recovery will not be attempted");
throw e;
}
}
}
// ========================================
HttpMethodRetryHandler handler =
(HttpMethodRetryHandler)
method.getParams().getParameter(HttpMethodParams.RETRY_HANDLER);
if (handler == null) {
handler = new DefaultHttpMethodRetryHandler();
}
if (!handler.retryMethod(method, e, execCount)) {
LOG.debug(
"Method retry handler returned false. "
+ "Automatic recovery will not be attempted");
throw e;
}
if (LOG.isInfoEnabled()) {
LOG.info(
"I/O exception ("
+ e.getClass().getName()
+ ") caught when processing request: "
+ e.getMessage());
}
if (LOG.isDebugEnabled()) {
LOG.debug(e.getMessage(), e);
}
LOG.info("Retrying request");
}
}
} catch (IOException e) {
if (this.conn.isOpen()) {
LOG.debug("Closing the connection.");
this.conn.close();
}
releaseConnection = true;
throw e;
} catch (RuntimeException e) {
if (this.conn.isOpen()) {
LOG.debug("Closing the connection.");
this.conn.close();
}
releaseConnection = true;
throw e;
}
}
