| /** |
| * 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 backtype.storm.security.auth; |
| |
| import java.io.IOException; |
| import org.apache.thrift.transport.TTransport; |
| import org.apache.thrift.transport.TTransportException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import backtype.storm.utils.StormBoundedExponentialBackoffRetry; |
| |
| public class TBackoffConnect { |
| private static final Logger LOG = LoggerFactory.getLogger(TBackoffConnect.class); |
| private int _completedRetries = 0; |
| private int _retryTimes; |
| private StormBoundedExponentialBackoffRetry waitGrabber; |
| |
| public TBackoffConnect(int retryTimes, int retryInterval, int retryIntervalCeiling) { |
| |
| _retryTimes = retryTimes; |
| waitGrabber = new StormBoundedExponentialBackoffRetry(retryInterval, |
| retryIntervalCeiling, |
| retryTimes); |
| } |
| |
| public TTransport doConnectWithRetry(ITransportPlugin transportPlugin, TTransport underlyingTransport, String host, String asUser) throws IOException { |
| boolean connected = false; |
| TTransport transportResult = null; |
| while(!connected) { |
| try { |
| transportResult = transportPlugin.connect(underlyingTransport, host, asUser); |
| connected = true; |
| } catch (TTransportException ex) { |
| retryNext(ex); |
| } |
| } |
| return transportResult; |
| } |
| |
| private void retryNext(TTransportException ex) { |
| if(!canRetry()) { |
| throw new RuntimeException(ex); |
| } |
| try { |
| int sleeptime = waitGrabber.getSleepTimeMs(_completedRetries, 0); |
| |
| LOG.debug("Failed to connect. Retrying... (" + Integer.toString( _completedRetries) + ") in " + Integer.toString(sleeptime) + "ms"); |
| |
| Thread.sleep(sleeptime); |
| } catch (InterruptedException e) { |
| LOG.info("Nimbus connection retry interrupted."); |
| } |
| |
| _completedRetries++; |
| } |
| |
| private boolean canRetry() { |
| return (_completedRetries < _retryTimes); |
| } |
| } |