Source Code Cross Referenced for TargetSource.java in  » J2EE » spring-framework-2.0.6 » org » springframework » aop » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.aop 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*<
02:         * Copyright 2002-2007 the original author or authors.
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         *      http://www.apache.org/licenses/LICENSE-2.0
09:         *
10:         * Unless required by applicable law or agreed to in writing, software
11:         * distributed under the License is distributed on an "AS IS" BASIS,
12:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13:         * See the License for the specific language governing permissions and
14:         * limitations under the License.
15:         */
16:
17:        package org.springframework.aop;
18:
19:        /**
20:         * A <code>TargetSource</code> is used to obtain the current "target" of
21:         * an AOP invocation, which will be invoked via reflection if no around
22:         * advice chooses to end the interceptor chain itself.
23:         *
24:         * <p>If a <code>TargetSource</code> is "static", it will always return
25:         * the same target, allowing optimizations in the AOP framework. Dynamic
26:         * target sources can support pooling, hot swapping, etc.
27:         *
28:         * <p>Application developers don't usually need to work with
29:         * <code>TargetSources</code> directly: this is an AOP framework interface.
30:         *
31:         * @author Rod Johnson
32:         */
33:        public interface TargetSource extends TargetClassAware {
34:
35:            /**
36:             * Return the type of targets returned by this {@link TargetSource}.
37:             * <p>Can return <code>null</code>, although certain usages of a
38:             * <code>TargetSource</code> might just work with a predetermined
39:             * target class.
40:             * @return the type of targets returned by this {@link TargetSource}
41:             */
42:            Class getTargetClass();
43:
44:            /**
45:             * Will all calls to {@link #getTarget()} return the same object?
46:             * <p>In that case, there will be no need to invoke
47:             * {@link #releaseTarget(Object)}, and the AOP framework can cache
48:             * the return value of {@link #getTarget()}.
49:             * @return <code>true</code> if the target is immutable
50:             * @see #getTarget
51:             */
52:            boolean isStatic();
53:
54:            /**
55:             * Return a target instance. Invoked immediately before the
56:             * AOP framework calls the "target" of an AOP method invocation.
57:             * @return the target object, which contains the joinpoint
58:             * @throws Exception if the target object can't be resolved
59:             */
60:            Object getTarget() throws Exception;
61:
62:            /**
63:             * Release the given target object obtained from the
64:             * {@link #getTarget()} method.
65:             * @param target object obtained from a call to {@link #getTarget()}
66:             * @throws Exception if the object can't be released
67:             */
68:            void releaseTarget(Object target) throws Exception;
69:
70:        }
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