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    1   package org.apache.turbine.services;
    2
    3
    4   /*
    5    * Licensed to the Apache Software Foundation (ASF) under one
    6    * or more contributor license agreements.  See the NOTICE file
    7    * distributed with this work for additional information
    8    * regarding copyright ownership.  The ASF licenses this file
    9    * to you under the Apache License, Version 2.0 (the
    10   * "License"); you may not use this file except in compliance
    11   * with the License.  You may obtain a copy of the License at
    12   *
    13   *   http://www.apache.org/licenses/LICENSE-2.0
    14   *
    15   * Unless required by applicable law or agreed to in writing,
    16   * software distributed under the License is distributed on an
    17   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    18   * KIND, either express or implied.  See the License for the
    19   * specific language governing permissions and limitations
    20   * under the License.
    21   */
    22
    23
    24  /**
    25   * This class provides a generic implementation of
    26   * <code>Initable</code>.  This implementation, that other
    27   * <code>Initables</code> are welcome to extend, contains facilities
    28   * to maintain internal state.
    29   *
    30   * @author <a href="mailto:burton@apache.org">Kevin Burton</a>
    31   * @author <a href="mailto:krzewski@e-point.pl">Rafal Krzewski</a>
    32   * @version $Id: BaseInitable.java 1773378 2016-12-09 13:19:59Z tv $
    33   */
    34  public class BaseInitable
    35          implements Initable
    36  {
    37      /** InitableBroker that instantiatd this class. */
    38      protected InitableBroker initableBroker;
    39
    40      /** Initialization status of this class. */
    41      protected boolean isInitialized = false;
    42
    43      /**
    44       * Default constructor of BaseInitable.
    45       *
    46       * This constructor does nothing.  Your own constructurs should be
    47       * modest in allocating memory and other resources, leaving this
    48       * to the <code>init()</code> method.
    49       */
    50      public BaseInitable()
    51      {
    52          // empty
    53      }
    54
    55      /**
    56       * Saves InitableBroker reference for later use.
    57       *
    58       * @param broker The InitableBroker that instantiated this object.
    59       */
    60      @Override
    61      public void setInitableBroker(InitableBroker broker)
    62      {
    63          this.initableBroker = broker;
    64      }
    65
    66      /**
    67       * Returns an InitableBroker reference.
    68       *
    69       * @return The InitableBroker that instantiated this object.
    70       */
    71      public InitableBroker getInitableBroker()
    72      {
    73          return initableBroker;
    74      }
    75
    76      /**
    77       * Performs early initialization.  Used in a manner similar to a ctor.
    78       *
    79       * BaseInitable doesn't need early initialization, therefore it
    80       * ignores all objects passed to it and performs no initialization
    81       * activities.
    82       *
    83       * @param data An Object to use for initialization activities.
    84       * @throws InitializationException Initialization of this
    85       * class was not successful.
    86       */
    87      @Override
    88      public void init(Object data) throws InitializationException
    89      {
    90          // empty
    91      }
    92
    93      /**
    94       * Performs late initialization.  Called when the Service is requested
    95       * for the first time (if not already completely initialized by the
    96       * early initializer).
    97       *
    98       * Late initialization of a BaseInitable is always successful.
    99       *
    100      * @throws InitializationException Initialization of this
    101      * class was not successful.
    102      */
    103     @Override
    104     public void init() throws InitializationException
    105     {
    106         // empty
    107     }
    108
    109     /**
    110      * Returns an Initable to uninitialized state.
    111      *
    112      * Calls setInit(false) to mark that we are no longer in initialized
    113      * state.
    114      */
    115     @Override
    116     public void shutdown()
    117     {
    118         setInit(false);
    119     }
    120
    121     /**
    122      * Returns initialization status.
    123      *
    124      * @return True if the initable is initialized.
    125      */
    126     @Override
    127     public boolean getInit()
    128     {
    129         return isInitialized;
    130     }
    131
    132     /**
    133      * Sets initialization status.
    134      *
    135      * @param value The new initialization status.
    136      */
    137     protected void setInit(boolean value)
    138     {
    139         this.isInitialized = value;
    140     }
    141 }