Source Code Cross Referenced for JAIServerConfigurationSpi.java in  » 6.0-JDK-Modules » Java-Advanced-Imaging » com » sun » media » jai » remote » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » Java Advanced Imaging » com.sun.media.jai.remote 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * $RCSfile: JAIServerConfigurationSpi.java,v $
03:         *
04:         * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
05:         *
06:         * Use is subject to license terms.
07:         *
08:         * $Revision: 1.1 $
09:         * $Date: 2005/02/11 04:56:49 $
10:         * $State: Exp $
11:         */
12:        package com.sun.media.jai.remote;
13:
14:        import javax.media.jai.JAI;
15:
16:        // This uses the ImageIO idea of "services" to look for
17:        // concrete class that implement this interface. These concrete
18:        // classes must have been registered/listed in the
19:        // META-INF/services/com.sun.media.jai.remote.JAIServerConfigurationSpi file.
20:
21:        /**
22:         * <p> An interface definition to aid in the automatic loading of
23:         * user-defined JAI based Remote Imaging server configuration logic.
24:         *
25:         * <p> All concrete classes that implement this
26:         * interface can register by listing themselves in the
27:         * "<code>META-INF/services/com.sun.media.jai.remote.JAIServerConfigurationSpi</code>"
28:         * file that can be found in the classpath (this file is often contained
29:         * in a jar file along with the class files). The file should contain
30:         * a list of fully-qualified concrete provider-class names, one per
31:         * line. Space and tab characters surrounding each name, as well as
32:         * blank lines, are ignored. The comment character is <tt>'#'</tt>
33:         * (<tt>0x23</tt>); on each line all characters following the first
34:         * comment character are ignored. The file must be encoded in UTF-8.
35:         *
36:         * <p> If a particular concrete provider class is named in more than one
37:         * configuration file, or is named in the same configuration file more
38:         * than once, then the duplicates will be ignored. The configuration
39:         * file naming a particular provider need not be in the same jar file or
40:         * other distribution unit as the provider itself. The provider must be
41:         * accessible from the same class loader that was initially queried to
42:         * locate the configuration file; note that this is not necessarily the
43:         * class loader that found the file.
44:         *
45:         * <p>All such concrete classes must have a zero-argument
46:         * constructor so that they may be instantiated during lookup. The
47:         * <code>updateServer()</code> method of all such registered
48:         * classes will be called with the default instance of the <code>JAI</code>
49:         * class. Note that this will take place after the JAI 
50:         * <code>OperationRegistry</code> has been initialized with the
51:         * default JAI registry file (META-INF/javax.media.jai.registryFile.jai), 
52:         * once all "META-INF/registryFile.jai"s found in the
53:         * classpath are loaded and the <code>updateRegistry</code> method of each
54:         * <code>OperationRegistrySpi</code> instance has been executed. There is
55:         * no guarantee of the order in which the <code>updateServer()</code> method
56:         * of each <code>JAIServerConfigurationSpi</code> instance will be invoked.
57:         *
58:         * <p>It is possible to provide arguments to a class implementing this 
59:         * interface (or any other Service Provider Interface) using the standard
60:         * <code>Java</code> <code> -D<propertyName>=<value></code> mechanism on
61:         * the command line when starting an application.
62:         *
63:         * @see javax.media.jai.remote.JAIRMIDescriptor
64:         * @see javax.media.jai.OperationRegistry
65:         * @see javax.media.jai.OperationRegistry#writeExternal
66:         * @see javax.media.jai.OperationRegistrySpi
67:         *
68:         * @since JAI 1.1
69:         */
70:        public interface JAIServerConfigurationSpi {
71:
72:            /**
73:             * This method will be called for all registered "service-providers"
74:             * of this interface just after the default <code>JAI</code> instance
75:             * has been constructed.
76:             */
77:            public void updateServer(JAI jaiInstance);
78:        }
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