-retry task container

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@539306 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/Retry.java

@@ -0,0 +1,58 @@
+/*
+ *  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 java.util.Enumeration;
+import java.util.Vector;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.Project;
+import org.apache.tools.ant.Task;
+import org.apache.tools.ant.TaskContainer;
+
+/**
+ * Retries the nested task a set number of times
+ */
+public class Retry extends Task implements TaskContainer {
+
+    private Task nestedTask;
+    
+    private int retryCount;
+    
+    public void addTask(Task t) {
+        nestedTask = t;
+    }
+    
+    public void setRetryCount(int n) {
+        retryCount = n;
+    }
+    
+    public void execute() throws BuildException {
+        for(int i=0; i<=retryCount; i++) {
+            try {
+                nestedTask.perform();
+            } catch (Exception e) {
+                if (i<retryCount) {
+                    log("Attempt ["+i+"] error occured, retrying...", e, Project.MSG_INFO);
+                } else {
+                    throw new BuildException("Task ["+nestedTask.getTaskName()+"] failed after ["+retryCount+"] attempts, giving up");
+                }
+            }
+        }
+    }
+}