Source Code Cross Referenced for Allocator.java in  » Science » javolution-5.2 » javolution » context » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » javolution 5.2 » javolution.context 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Javolution - Java(TM) Solution for Real-Time and Embedded Systems
03:         * Copyright (C) 2006 - Javolution (http://javolution.org/)
04:         * All rights reserved.
05:         * 
06:         * Permission to use, copy, modify, and distribute this software is
07:         * freely granted, provided that this notice is preserved.
08:         */
09:        package javolution.context;
10:
11:        /**
12:         * <p> This class represents an object allocator; instances of this class
13:         *     are generated by {@link AllocatorContext}.</p>
14:         *     
15:         * <p> If an allocator has recycled objects available, those are returned 
16:         *     first, before allocating new ones.</p>      
17:         *     
18:         * <p> Allocator instances are thread-safe without synchronization, 
19:         *     they are the "production lines" of the {@link ObjectFactory factories},
20:         *     their implementation is derived from the {@link AllocatorContext}
21:         *     to which they belong (e.g. heap allocators for {@link HeapContext}).</p>
22:         *     
23:         * @author  <a href="mailto:jean-marie@dautelle.com">Jean-Marie Dautelle</a>
24:         * @version 5.2, August 14, 2007
25:         * @see     AllocatorContext#getAllocator(ObjectFactory)
26:         */
27:        public abstract class Allocator /*<T>*/{
28:
29:            /**
30:             * Holds the current user or <code>null</code> if deactivated.  
31:             */
32:            protected Thread user;
33:
34:            /**
35:             * Holds the queue of available objects (typically recycled).  
36:             */
37:            protected Object/*{T}*/[] queue = (Object/*{T}*/[]) new Object[16];
38:
39:            /**
40:             * Holds the number of objects in this allocator queue.   
41:             */
42:            protected int queueSize;
43:
44:            /**
45:             * Indicates if the objects from the queue should be kept in the queue.   
46:             */
47:            protected boolean keepInQueue;
48:
49:            /**
50:             * Default constructor.
51:             */
52:            protected Allocator() {
53:            }
54:
55:            /**
56:             * Returns the next available object from this allocator queue or 
57:             * {@link #allocate} one if none available.
58:             * 
59:             * @return the next available object ready to use.
60:             */
61:            public final Object/*{T}*/next() {
62:                return queueSize > 0 ? (keepInQueue ? queue[--queueSize]
63:                        : removeLast()) : allocate();
64:            }
65:
66:            private final Object/*{T}*/removeLast() {
67:                Object/*{T}*/obj = queue[--queueSize];
68:                queue[queueSize] = null;
69:                return obj;
70:            }
71:
72:            /**
73:             * Allocates a new object, this method is called when the allocator queue 
74:             * is empty.
75:             * 
76:             * @return the allocated object.
77:             */
78:            protected abstract Object/*{T}*/allocate();
79:
80:            /**
81:             * Recycles the specified object to this queue.
82:             * 
83:             * @param object the object to recycle.
84:             */
85:            protected abstract void recycle(Object/*{T}*/object);
86:
87:            /**
88:             * Resizes this allocator queue (hopefully rare as implementation should 
89:             * keep the queue small).
90:             */
91:            void resize() {
92:                Object/*{T}*/[] tmp = (Object/*{T}*/[]) new Object[queue.length * 2];
93:                System.arraycopy(queue, 0, tmp, 0, queue.length);
94:                queue = tmp;
95:            }
96:
97:        }
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