/**
* Report and attempt to recover from {@code e}. Returns true if the HTTP engine was replaced and
* the request should be retried. Otherwise the failure is permanent.
*/
private boolean handleFailure(IOException e) throws IOException {
RouteSelector routeSelector = httpEngine.routeSelector;
if (routeSelector != null && httpEngine.connection != null) {
routeSelector.connectFailed(httpEngine.connection, e);
}
OutputStream requestBody = httpEngine.getRequestBody();
boolean canRetryRequestBody =
requestBody == null
|| requestBody instanceof RetryableOutputStream
|| (faultRecoveringRequestBody != null && faultRecoveringRequestBody.isRecoverable());
if (routeSelector == null && httpEngine.connection == null // No connection.
|| routeSelector != null && !routeSelector.hasNext() // No more routes to attempt.
|| !isRecoverable(e)
|| !canRetryRequestBody) {
httpEngineFailure = e;
return false;
}
httpEngine.release(true);
RetryableOutputStream retryableOutputStream =
requestBody instanceof RetryableOutputStream ? (RetryableOutputStream) requestBody : null;
httpEngine = newHttpEngine(method, rawRequestHeaders, null, retryableOutputStream);
httpEngine.routeSelector = routeSelector; // Keep the same routeSelector.
if (faultRecoveringRequestBody != null && faultRecoveringRequestBody.isRecoverable()) {
httpEngine.sendRequest();
faultRecoveringRequestBody.replaceStream(httpEngine.getRequestBody());
}
return true;
}
/**
* Sends a request and optionally reads a response. Returns true if the request was successfully
* executed, and false if the request can be retried. Throws an exception if the request failed
* permanently.
*/
private boolean execute(boolean readResponse) throws IOException {
try {
httpEngine.sendRequest();
if (readResponse) {
httpEngine.readResponse();
}
return true;
} catch (IOException e) {
if (handleFailure(e)) {
return false;
} else {
throw e;
}
}
}