| /* |
| * 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 |
| * |
| * https://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 org.apache.tools.ant.util; |
| |
| import java.io.IOException; |
| |
| import org.apache.tools.ant.Project; |
| import org.apache.tools.ant.Task; |
| |
| /** |
| * A simple utility class to take a piece of code (that implements |
| * <code>Retryable</code> interface) and executes that with possibility to |
| * retry the execution in case of IOException. |
| */ |
| public class RetryHandler { |
| |
| private int retriesAllowed = 0; |
| private Task task; |
| |
| /** |
| * Create a new RetryingHandler. |
| * |
| * @param retriesAllowed how many times to retry |
| * @param task the Ant task that is is executed from, used for logging only |
| */ |
| public RetryHandler(int retriesAllowed, Task task) { |
| this.retriesAllowed = retriesAllowed; |
| this.task = task; |
| } |
| |
| /** |
| * Execute the <code>Retryable</code> code with specified number of retries. |
| * |
| * @param exe the code to execute |
| * @param desc some descriptive text for this piece of code, used for logging |
| * @throws IOException if the number of retries has exceeded the allowed limit |
| */ |
| public void execute(Retryable exe, String desc) throws IOException { |
| int retries = 0; |
| while (true) { |
| try { |
| exe.execute(); |
| break; |
| } catch (IOException e) { |
| retries++; |
| if (retries > this.retriesAllowed && this.retriesAllowed > -1) { |
| task.log("try #" + retries + ": IO error (" |
| + desc + "), number of maximum retries reached (" |
| + this.retriesAllowed + "), giving up", Project.MSG_WARN); |
| throw e; |
| } else { |
| task.log("try #" + retries + ": IO error (" + desc |
| + "), retrying", Project.MSG_WARN); |
| } |
| } |
| } |
| } |
| |
| } |