1 files changed, 74 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/RetryHandler.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/RetryHandler.java
new file mode 100644
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--- /dev/null
+++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/RetryHandler.java
@@ -0,0 +1,74 @@
+/*
+ *  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.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);
+                }
+            }
+        }
+    }
+
+}