| /* |
| * Copyright © 2012-2014 Cask Data, Inc. |
| * |
| * Licensed 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 co.cask.tephra.distributed; |
| |
| import co.cask.tephra.TxConstants; |
| import org.apache.hadoop.conf.Configuration; |
| |
| /** |
| * A retry strategy that makes N attempts and then gives up. This does |
| * not do anything before the re-attempt - extend this class to add a |
| * sleep or similar. |
| */ |
| public class RetryNTimes extends RetryStrategy { |
| |
| int attempts = 0; |
| int limit; |
| |
| /** |
| * @param maxAttempts the number of attempts after which to stop |
| */ |
| protected RetryNTimes(int maxAttempts) { |
| limit = maxAttempts; |
| } |
| |
| @Override |
| boolean failOnce() { |
| ++attempts; |
| return attempts < limit; |
| } |
| |
| /** |
| * A retry strategy provider for this strategy. |
| */ |
| public static class Provider implements RetryStrategyProvider { |
| |
| int nTimes; |
| |
| public Provider() { |
| this.nTimes = TxConstants.Service.DEFAULT_DATA_TX_CLIENT_ATTEMPTS; |
| } |
| |
| @Override |
| public void configure(Configuration config) { |
| nTimes = config.getInt(TxConstants.Service.CFG_DATA_TX_CLIENT_ATTEMPTS, nTimes); |
| } |
| |
| @Override |
| public RetryStrategy newRetryStrategy() { |
| return new RetryNTimes(nTimes); |
| } |
| |
| @Override |
| public String toString() { |
| return nTimes + " attempts without delay"; |
| } |
| } |
| } |