Source Code Cross Referenced for Initable.java in  » Web-Framework » TURBINE » org » apache » turbine » services » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » TURBINE » org.apache.turbine.services 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package org.apache.turbine.services;
02:
03:        /*
04:         * Licensed to the Apache Software Foundation (ASF) under one
05:         * or more contributor license agreements.  See the NOTICE file
06:         * distributed with this work for additional information
07:         * regarding copyright ownership.  The ASF licenses this file
08:         * to you under the Apache License, Version 2.0 (the
09:         * "License"); you may not use this file except in compliance
10:         * with the License.  You may obtain a copy of the License at
11:         *
12:         *   http://www.apache.org/licenses/LICENSE-2.0
13:         *
14:         * Unless required by applicable law or agreed to in writing,
15:         * software distributed under the License is distributed on an
16:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17:         * KIND, either express or implied.  See the License for the
18:         * specific language governing permissions and limitations
19:         * under the License.
20:         */
21:
22:        /**
23:         * Classes that implement this interface need initialization before
24:         * they can work.
25:         *
26:         * These classes rely also on an <code>InitableBroker</code> that
27:         * ensures that there is only one instance of the class in the system,
28:         * and handles dependencies between <code>Initables</code>.
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: Initable.java 534527 2007-05-02 16:10:59Z tv $
33:         */
34:        public interface Initable {
35:            /**
36:             * Provides an Initable with a reference to the InitableBroker
37:             * that instantiated this object, so that it can access other
38:             * Initables.
39:             *
40:             * @param broker The InitableBroker that instantiated this object.
41:             */
42:            void setInitableBroker(InitableBroker broker);
43:
44:            /**
45:             * Performs early initailization of an Initable
46:             *
47:             * During the startup of the system, different objects may be
48:             * passed to your class using this method.  It should ignore any
49:             * objects that it doesn't need or understand.
50:             *
51:             * After the class changes its internal state so that getInit()
52:             * returns true, this method will be called no more, and late
53:             * initialization will not be performed.
54:             *
55:             * If your class relies on early initialization, and the object it
56:             * expects was not received, you can use late initialization to
57:             * throw an exception and complain.
58:             *
59:             * @param data An Object to use for initialization activities.
60:             * @exception InitializationException if initilaization of this
61:             * class was not successful.
62:             */
63:            void init(Object data) throws InitializationException;
64:
65:            /**
66:             * Performs late initialization of an Initable.
67:             *
68:             * When your class is being requested from an InitableBroker, it
69:             * will call getInit(), and if it returns false, this method will
70:             * be invoked.
71:             *
72:             * @exception InitializationException if initialization of this
73:             * class was not successful.
74:             */
75:            void init() throws InitializationException;
76:
77:            /**
78:             * Returns an <code>Initable</code> to an uninitialized state.
79:             *
80:             * <p>This method must release all resources allocated by the
81:             * <code>Initable</code> implementation, and resetting its internal state.
82:             * You may chose to implement this operation or not. If you support
83:             * this operation, getInit() should return false after successful
84:             * shutdown of the service.
85:             */
86:            void shutdown();
87:
88:            /**
89:             * Returns initialization status of an Initable.
90:             *
91:             * @return Initialization status of an Initable.
92:             */
93:            boolean getInit();
94:        }
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