Initial ONAP Synapse commit

[aai/data-router.git] / src / main / java / org / openecomp / datarouter / util / FileWatcher.java

diff --git a/src/main/java/org/openecomp/datarouter/util/FileWatcher.java b/src/main/java/org/openecomp/datarouter/util/FileWatcher.java
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+/**
+ * ============LICENSE_START=======================================================
+ * DataRouter
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property.
+ * Copyright © 2017 Amdocs
+ * 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=========================================================
+ *
+ * ECOMP and OpenECOMP are trademarks
+ * and service marks of AT&T Intellectual Property.
+ */
+package org.openecomp.datarouter.util;
+
+import java.io.File;
+import java.util.TimerTask;
+
+public abstract class FileWatcher extends TimerTask {
+  private long timeStamp;
+  private File file;
+
+  public FileWatcher(File file) {
+    this.file = file;
+    this.timeStamp = file.lastModified();
+  }
+
+  public final void run() {
+    long timeStamp = file.lastModified();
+
+    if ((timeStamp - this.timeStamp) > 500) {
+      this.timeStamp = timeStamp;
+      onChange(file);
+    }
+  }
+  
+  protected abstract void onChange(File file);
+}
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