hadoop ReconfigurationException 源码

haddop ReconfigurationException 代码

文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/ReconfigurationException.java

/**
 * 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;


/**
 * Exception indicating that configuration property cannot be changed
 * at run time.
 */
public class ReconfigurationException extends Exception {

  private static final long serialVersionUID = 1L;

  private String property;
  private String newVal;
  private String oldVal;

  /**
   * Construct the exception message.
   */
  private static String constructMessage(String property, 
                                         String newVal, String oldVal) {
    String message = "Could not change property " + property;
    if (oldVal != null) {
      message += " from \'" + oldVal;
    }
    if (newVal != null) {
      message += "\' to \'" + newVal + "\'";
    }
    return message;
  }

  
  /**
   * Create a new instance of {@link ReconfigurationException}.
   */
  public ReconfigurationException() {
    super("Could not change configuration.");
    this.property = null;
    this.newVal = null;
    this.oldVal = null;
  }

  /**
   * Create a new instance of {@link ReconfigurationException}.
   * @param property property name.
   * @param newVal new value.
   * @param oldVal old value.
   * @param cause original exception.
   */
  public ReconfigurationException(String property, 
                                  String newVal, String oldVal,
                                  Throwable cause) {
    super(constructMessage(property, newVal, oldVal), cause);
    this.property = property;
    this.newVal = newVal;
    this.oldVal = oldVal;
  }

  /**
   * Create a new instance of {@link ReconfigurationException}.
   * @param property property name.
   * @param newVal new value.
   * @param oldVal old value.
   */
  public ReconfigurationException(String property, 
                                  String newVal, String oldVal) {
    super(constructMessage(property, newVal, oldVal));
    this.property = property;
    this.newVal = newVal;
    this.oldVal = oldVal;
  }

  /**
   * Get property that cannot be changed.
   * @return property info.
   */
  public String getProperty() {
    return property;
  }

  /**
   * Get value to which property was supposed to be changed.
   * @return new value.
   */
  public String getNewValue() {
    return newVal;
  }

  /**
   * Get old value of property that cannot be changed.
   * @return old value.
   */
  public String getOldValue() {
    return oldVal;
  }

}

相关信息

hadoop 源码目录

相关文章

hadoop ConfServlet 源码

hadoop ConfigRedactor 源码

hadoop Configurable 源码

hadoop Configuration 源码

hadoop ConfigurationWithLogging 源码

hadoop Configured 源码

hadoop Reconfigurable 源码

hadoop ReconfigurableBase 源码

hadoop ReconfigurationServlet 源码

hadoop ReconfigurationTaskStatus 源码