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From ni...@apache.org
Subject svn commit: r1038493 - /hadoop/common/trunk/src/java/org/apache/hadoop/conf/Reconfigurable.java
Date Wed, 24 Nov 2010 06:16:03 GMT
Author: nigel
Date: Wed Nov 24 06:16:03 2010
New Revision: 1038493

URL: http://svn.apache.org/viewvc?rev=1038493&view=rev
Log:
HADOOP-7001.  Configuration changes can occur via the Reconfigurable interface. (Patrick Kline
via dhruba and nigel)

Added:
    hadoop/common/trunk/src/java/org/apache/hadoop/conf/Reconfigurable.java

Added: hadoop/common/trunk/src/java/org/apache/hadoop/conf/Reconfigurable.java
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/src/java/org/apache/hadoop/conf/Reconfigurable.java?rev=1038493&view=auto
==============================================================================
--- hadoop/common/trunk/src/java/org/apache/hadoop/conf/Reconfigurable.java (added)
+++ hadoop/common/trunk/src/java/org/apache/hadoop/conf/Reconfigurable.java Wed Nov 24 06:16:03
2010
@@ -0,0 +1,57 @@
+/**
+ * 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.hadoop.conf;
+
+import java.util.Collection;
+
+/**
+ * Something whose {@link Configuration} can be changed at run time.
+ */
+public interface Reconfigurable extends Configurable {
+
+  /**
+   * Change a configuration property on this object to the value specified.
+   *
+   * Change a configuration property on this object to the value specified 
+   * and return the previous value that the configuration property was set to
+   * (or null if it was not previously set). If newVal is null, set the property
+   * to its default value;
+   *
+   * If the property cannot be changed, throw a 
+   * {@link ReconfigurationException}.
+   */
+  public String reconfigureProperty(String property, String newVal) 
+    throws ReconfigurationException;
+
+  /**
+   * Return whether a given property is changeable at run time.
+   *
+   * If isPropertyReconfigurable returns true for a property,
+   * then changeConf should not throw an exception when changing
+   * this property.
+   */
+  public boolean isPropertyReconfigurable(String property);
+
+  /**
+   * Return all the properties that can be changed at run time.
+   */
+  public Collection<String> getReconfigurableProperties();
+
+
+}



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