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    1   /*
    2    *  Licensed to the Apache Software Foundation (ASF) under one
    3    *  or more contributor license agreements.  See the NOTICE file
    4    *  distributed with this work for additional information
    5    *  regarding copyright ownership.  The ASF licenses this file
    6    *  to you under the Apache License, Version 2.0 (the
    7    *  "License"); you may not use this file except in compliance
    8    *  with the License.  You may obtain a copy of the License at
    9    *
    10   *    http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   *  Unless required by applicable law or agreed to in writing,
    13   *  software distributed under the License is distributed on an
    14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   *  KIND, either express or implied.  See the License for the
    16   *  specific language governing permissions and limitations
    17   *  under the License.
    18   *
    19   */
    20  package org.apache.mina.common;
    21
    22  import org.apache.mina.common.support.DefaultExceptionMonitor;
    23
    24  /**
    25   * Monitors uncaught exceptions.  {@link #exceptionCaught(Throwable)} is
    26   * invoked when there are any uncaught exceptions.
    27   * <p>
    28   * You can monitor any uncaught exceptions by setting {@link ExceptionMonitor}
    29   * by calling {@link #setInstance(ExceptionMonitor)}.  The default
    30   * monitor logs all caught exceptions in <tt>WARN</tt> level using
    31   * SLF4J.
    32   *
    33   * @author The Apache Directory Project (mina-dev@directory.apache.org)
    34   * @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (Fri, 13 Jul 2007) $
    35   *
    36   * @see DefaultExceptionMonitor
    37   */
    38  public abstract class ExceptionMonitor {
    39      private static ExceptionMonitor instance = new DefaultExceptionMonitor();
    40
    41      /**
    42       * Returns the current exception monitor.
    43       */
    44      public static ExceptionMonitor getInstance() {
    45          return instance;
    46      }
    47
    48      /**
    49       * Sets the uncaught exception monitor.  If <code>null</code> is specified,
    50       * the default monitor will be set.
    51       *
    52       * @param monitor A new instance of {@link DefaultExceptionMonitor} is set
    53       *                if <tt>null</tt> is specified.
    54       */
    55      public static void setInstance(ExceptionMonitor monitor) {
    56          if (monitor == null) {
    57              monitor = new DefaultExceptionMonitor();
    58          }
    59          instance = monitor;
    60      }
    61
    62      /**
    63       * Invoked when there are any uncaught exceptions.
    64       */
    65      public abstract void exceptionCaught(Throwable cause);
    66  }