/* | |
* 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 org.apache.tools.ant.taskdefs; | |
import org.apache.tools.ant.BuildException; | |
import org.apache.tools.ant.Project; | |
import org.apache.tools.ant.Task; | |
import org.apache.tools.ant.TaskContainer; | |
import org.apache.tools.ant.util.StringUtils; | |
/** | |
* Retries the nested task a set number of times | |
* @since Ant 1.7.1 | |
*/ | |
public class Retry extends Task implements TaskContainer { | |
/** | |
* task to execute n times | |
*/ | |
private Task nestedTask; | |
/** | |
* set retryCount to 1 by default | |
*/ | |
private int retryCount = 1; | |
/** | |
* set the task | |
* @param t the task to retry. | |
*/ | |
public synchronized void addTask(Task t) { | |
if (nestedTask != null) { | |
throw new BuildException( | |
"The retry task container accepts a single nested task" | |
+ " (which may be a sequential task container)"); | |
} | |
nestedTask = t; | |
} | |
/** | |
* set the number of times to retry the task | |
* @param n the number to use. | |
*/ | |
public void setRetryCount(int n) { | |
retryCount = n; | |
} | |
/** | |
* perform the work | |
* @throws BuildException if there is an error. | |
*/ | |
public void execute() throws BuildException { | |
StringBuffer errorMessages = new StringBuffer(); | |
for (int i = 0; i <= retryCount; i++) { | |
try { | |
nestedTask.perform(); | |
break; | |
} catch (Exception e) { | |
errorMessages.append(e.getMessage()); | |
if (i >= retryCount) { | |
StringBuffer exceptionMessage = new StringBuffer(); | |
exceptionMessage.append("Task [").append(nestedTask.getTaskName()); | |
exceptionMessage.append("] failed after [").append(retryCount); | |
exceptionMessage.append("] attempts; giving up.").append(StringUtils.LINE_SEP); | |
exceptionMessage.append("Error messages:").append(StringUtils.LINE_SEP); | |
exceptionMessage.append(errorMessages); | |
throw new BuildException(exceptionMessage.toString(), getLocation()); | |
} | |
log("Attempt [" + i + "]: error occurred; retrying...", e, Project.MSG_INFO); | |
errorMessages.append(StringUtils.LINE_SEP); | |
} | |
} | |
} | |
} |