1 files changed, 59 insertions, 0 deletions
diff --git a/ajsc-aai/src/main/java/org/openecomp/aai/util/FileWatcher.java b/ajsc-aai/src/main/java/org/openecomp/aai/util/FileWatcher.java
new file mode 100644
index 0000000..84e7a1a
--- /dev/null
+++ b/ajsc-aai/src/main/java/org/openecomp/aai/util/FileWatcher.java
@@ -0,0 +1,59 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.openecomp.aai
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.aai.util;
+
+import java.util.*;
+import java.io.*;
+
+public abstract class FileWatcher extends TimerTask {
+  private long timeStamp;
+  private File file;
+
+  /**
+   * Instantiates a new file watcher.
+   *
+   * @param file the file
+   */
+  public FileWatcher( File file ) {
+    this.file = file;
+    this.timeStamp = file.lastModified();
+  }
+
+  /**
+   * runs a timer task
+   * @see java.util.TimerTask.run
+   */
+  public final void run() {
+    long timeStamp = file.lastModified();
+
+    if( (timeStamp - this.timeStamp) > 500 ) {
+      this.timeStamp = timeStamp;
+      onChange(file);
+    }
+  }
+  
+  /**
+   * On change.
+   *
+   * @param file the file
+   */
+  protected abstract void onChange( File file );
+}