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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.support;
    21
    22  import java.lang.reflect.Method;
    23
    24  import org.apache.mina.common.DefaultIoFilterChainBuilder;
    25  import org.apache.mina.common.ExecutorThreadModel;
    26  import org.apache.mina.common.IoFilterChainBuilder;
    27  import org.apache.mina.common.IoServiceConfig;
    28  import org.apache.mina.common.ThreadModel;
    29
    30  /**
    31   * A base implementation of {@link IoServiceConfig}.
    32   *
    33   * @author The Apache Directory Project (mina-dev@directory.apache.org)
    34   * @version $Rev: 629332 $, $Date: 2008-02-20 12:33:32 +0900 (Wed, 20 Feb 2008) $
    35   */
    36  public abstract class BaseIoServiceConfig implements IoServiceConfig, Cloneable {
    37      /**
    38       * Current filter chain builder.
    39       */
    40      private IoFilterChainBuilder filterChainBuilder = new DefaultIoFilterChainBuilder();
    41
    42      /**
    43       * The default thread model (initialized lazily).
    44       */
    45      private ThreadModel defaultThreadModel;
    46
    47      /**
    48       * Current thread model.
    49       */
    50      private ThreadModel threadModel;
    51
    52      public BaseIoServiceConfig() {
    53          super();
    54      }
    55
    56      public IoFilterChainBuilder getFilterChainBuilder() {
    57          return filterChainBuilder;
    58      }
    59
    60      public void setFilterChainBuilder(IoFilterChainBuilder builder) {
    61          if (builder == null) {
    62              builder = new DefaultIoFilterChainBuilder();
    63          }
    64          filterChainBuilder = builder;
    65      }
    66
    67      public DefaultIoFilterChainBuilder getFilterChain() {
    68          if (filterChainBuilder instanceof DefaultIoFilterChainBuilder) {
    69              return (DefaultIoFilterChainBuilder) filterChainBuilder;
    70          } else {
    71              throw new IllegalStateException(
    72                      "Current filter chain builder is not a DefaultIoFilterChainBuilder.");
    73          }
    74      }
    75
    76      public ThreadModel getThreadModel() {
    77          if (threadModel == null) {
    78              threadModel = getDefaultThreadModel();
    79          }
    80          return threadModel;
    81      }
    82
    83      public void setThreadModel(ThreadModel threadModel) {
    84          if (threadModel == null) {
    85              // We reuse the previous default model to prevent too much
    86              // daemon threads are created.
    87              threadModel = getDefaultThreadModel();
    88          }
    89          this.threadModel = threadModel;
    90      }
    91
    92      private synchronized ThreadModel getDefaultThreadModel() {
    93          if (defaultThreadModel == null) {
    94              defaultThreadModel = ExecutorThreadModel.getInstance("AnonymousIoService");
    95          }
    96          return defaultThreadModel;
    97      }
    98      @Override
    99      public Object clone() {
    100         BaseIoServiceConfig ret;
    101         try {
    102             ret = (BaseIoServiceConfig) super.clone();
    103         } catch (CloneNotSupportedException e) {
    104             throw (InternalError) new InternalError().initCause(e);
    105         }
    106
    107         // Try to clone the chain builder.
    108         try {
    109             Method cloneMethod = this.filterChainBuilder.getClass().getMethod(
    110                     "clone");
    111             if (cloneMethod.isAccessible()) {
    112                 ret.filterChainBuilder = (IoFilterChainBuilder) cloneMethod
    113                         .invoke(this.filterChainBuilder);
    114             }
    115         } catch (Exception e) {
    116             // uncloneable
    117         }
    118
    119         return ret;
    120     }
    121 }