Source Code Cross Referenced for EntityBridgeInvocationHandler.java in  » EJB-Server-JBoss-4.2.1 » server » org » jboss » ejb » plugins » cmp » bridge » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server JBoss 4.2.1 » server » org.jboss.ejb.plugins.cmp.bridge 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * JBoss, Home of Professional Open Source.
003:         * Copyright 2006, Red Hat Middleware LLC, and individual contributors
004:         * as indicated by the @author tags. See the copyright.txt file in the
005:         * distribution for a full listing of individual contributors.
006:         *
007:         * This is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU Lesser General Public License as
009:         * published by the Free Software Foundation; either version 2.1 of
010:         * the License, or (at your option) any later version.
011:         *
012:         * This software is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015:         * Lesser General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this software; if not, write to the Free
019:         * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021:         */
022:        package org.jboss.ejb.plugins.cmp.bridge;
023:
024:        import java.lang.reflect.Method;
025:        import java.util.Map;
026:
027:        import javax.ejb.EJBException;
028:        import javax.ejb.FinderException;
029:
030:        import org.jboss.ejb.EntityEnterpriseContext;
031:        import org.jboss.proxy.compiler.InvocationHandler;
032:
033:        /**
034:         * EntityBridgeInvocationHandler is the invocation hander used by the CMP 2.x
035:         * dynamic proxy. This class only interacts with the EntityBridge. The main
036:         * job of this class is to deligate invocation of abstract methods to the
037:         * appropriate EntityBridge method.
038:         * <p/>
039:         * Life-cycle:
040:         * Tied to the life-cycle of an entity bean instance.
041:         * <p/>
042:         * Multiplicity:
043:         * One per cmp entity bean instance, including beans in pool.
044:         *
045:         * @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
046:         * @author <a href="mailto:alex@jboss.org">Alexey Loubyansky</a>
047:         * @version $Revision: 57209 $
048:         */
049:        public class EntityBridgeInvocationHandler implements  InvocationHandler {
050:            private final Class beanClass;
051:            private final Map fieldMap;
052:            private final Map selectorMap;
053:            private EntityEnterpriseContext ctx;
054:
055:            /**
056:             * Creates an invocation handler for the specified entity.
057:             */
058:            public EntityBridgeInvocationHandler(Map fieldMap, Map selectorMap,
059:                    Class beanClass) {
060:                this .beanClass = beanClass;
061:                this .fieldMap = fieldMap;
062:                this .selectorMap = selectorMap;
063:            }
064:
065:            public void setContext(EntityEnterpriseContext ctx) {
066:                if (ctx != null && !beanClass.isInstance(ctx.getInstance())) {
067:                    throw new EJBException(
068:                            "Instance must be an instance of beanClass");
069:                }
070:                this .ctx = ctx;
071:            }
072:
073:            public Object invoke(Object proxy, Method method, Object[] args)
074:                    throws FinderException {
075:                // todo find a better workaround
076:                // CMP/CMR field bridges are mapped to its abstract method names because of the bug
077:                // in reflection introduced in Sun's 1.4 JVM, i.e. when an abstract class C1 extends a super class C2
078:                // and implements interface I and C2 and I both declare method with the same signature M,
079:                // C1.getMethods() will contain M twice.
080:                // ejbSelect methods are mapped to Method objects instead. Because ejbSelect methods having the same name
081:                // might have different signatures. Hopefully, the probability of an ejbSelect method to appear in an interface
082:                // is lower.
083:
084:                String methodName = method.getName();
085:
086:                BridgeInvoker invoker = (BridgeInvoker) fieldMap
087:                        .get(methodName);
088:                if (invoker == null) {
089:                    //invoker = (BridgeInvoker) selectorMap.get(methodName);
090:                    invoker = (BridgeInvoker) selectorMap.get(method);
091:
092:                    if (invoker == null) {
093:                        throw new EJBException(
094:                                "Method is not a known CMP field "
095:                                        + "accessor, CMR field accessor, or ejbSelect method: "
096:                                        + "methodName=" + methodName);
097:                    }
098:                }
099:
100:                try {
101:                    return invoker.invoke(ctx, method, args);
102:                } catch (RuntimeException e) {
103:                    throw e;
104:                } catch (FinderException e) {
105:                    throw e;
106:                } catch (Exception e) {
107:                    throw new EJBException("Internal error", e);
108:                }
109:            }
110:
111:            // Inner
112:
113:            public interface BridgeInvoker {
114:                Object invoke(EntityEnterpriseContext ctx, Method method,
115:                        Object[] args) throws FinderException, Exception;
116:            }
117:
118:            public static class FieldGetInvoker implements  BridgeInvoker {
119:                private final FieldBridge field;
120:
121:                public FieldGetInvoker(FieldBridge field) {
122:                    this .field = field;
123:                }
124:
125:                public Object invoke(EntityEnterpriseContext ctx,
126:                        Method method, Object[] args) {
127:                    // In the case of ejbHome methods there is no context, but ejb home
128:                    // methods are only allowed to call selectors.
129:                    if (ctx == null) {
130:                        throw new EJBException(
131:                                "EJB home methods are not allowed to "
132:                                        + "access CMP or CMR fields: methodName="
133:                                        + method.getName());
134:                    }
135:
136:                    return field.getValue(ctx);
137:                }
138:            }
139:
140:            public static class FieldSetInvoker implements  BridgeInvoker {
141:                private final FieldBridge field;
142:
143:                public FieldSetInvoker(FieldBridge field) {
144:                    this .field = field;
145:                }
146:
147:                public Object invoke(EntityEnterpriseContext ctx,
148:                        Method method, Object[] args) {
149:                    // In the case of ejbHome methods there is no context, but ejb home
150:                    // methods are only allowed to call selectors.
151:                    if (ctx == null) {
152:                        throw new EJBException(
153:                                "EJB home methods are not allowed to "
154:                                        + "access CMP or CMR fields: methodName="
155:                                        + method.getName());
156:                    }
157:
158:                    field.setValue(ctx, args[0]);
159:                    return null;
160:                }
161:            }
162:        }
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