Source Code Cross Referenced for EntityReentranceInterceptor.java in  » EJB-Server-JBoss-4.2.1 » server » org » jboss » ejb » plugins » 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 
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;
023:
024:        import java.lang.reflect.Method;
025:        import java.rmi.RemoteException;
026:        import javax.ejb.EJBObject;
027:        import javax.ejb.EJBException;
028:        import javax.transaction.Transaction;
029:        import javax.transaction.Status;
030:
031:        import org.jboss.invocation.Invocation;
032:        import org.jboss.invocation.InvocationType;
033:        import org.jboss.ejb.Container;
034:        import org.jboss.ejb.EntityEnterpriseContext;
035:        import org.jboss.metadata.EntityMetaData;
036:        import org.jboss.ejb.plugins.lock.Entrancy;
037:        import org.jboss.ejb.plugins.lock.NonReentrantLock;
038:        import org.jboss.ejb.plugins.cmp.jdbc.bridge.CMRInvocation;
039:
040:        /**
041:         * The role of this interceptor is to check for reentrancy.
042:         * Per the spec, throw an exception if instance is not marked
043:         * as reentrant.  We do not check to see if same Tx is
044:         * accessing object at the same time as we assume that
045:         * any transactional locks will handle this.
046:         *
047:         * <p><b>WARNING: critical code</b>, get approval from senior developers
048:         *    before changing.
049:         *
050:         * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
051:         * @version $Revision: 57209 $
052:         */
053:        public class EntityReentranceInterceptor extends AbstractInterceptor {
054:            protected boolean reentrant = false;
055:
056:            // Public --------------------------------------------------------
057:
058:            public void setContainer(Container container) {
059:                super .setContainer(container);
060:                if (container != null) {
061:                    EntityMetaData meta = (EntityMetaData) container
062:                            .getBeanMetaData();
063:                    reentrant = meta.isReentrant();
064:                }
065:            }
066:
067:            protected boolean isTxExpired(Transaction miTx) throws Exception {
068:                if (miTx != null
069:                        && miTx.getStatus() == Status.STATUS_MARKED_ROLLBACK) {
070:                    return true;
071:                }
072:                return false;
073:            }
074:
075:            public Object invoke(Invocation mi) throws Exception {
076:                // We are going to work with the context a lot
077:                EntityEnterpriseContext ctx = (EntityEnterpriseContext) mi
078:                        .getEnterpriseContext();
079:                boolean nonReentrant = !(reentrant || isReentrantMethod(mi));
080:
081:                // Not a reentrant method like getPrimaryKey
082:                NonReentrantLock methodLock = ctx.getMethodLock();
083:                Transaction miTx = ctx.getTransaction();
084:                boolean locked = false;
085:                try {
086:                    while (!locked) {
087:                        if (methodLock.attempt(5000, miTx, nonReentrant)) {
088:                            locked = true;
089:                        } else {
090:                            if (isTxExpired(miTx)) {
091:                                log.error("Saw rolled back tx=" + miTx);
092:                                throw new RuntimeException(
093:                                        "Transaction marked for rollback, possibly a timeout");
094:                            }
095:                        }
096:                    }
097:                } catch (NonReentrantLock.ReentranceException re) {
098:                    if (mi.getType() == InvocationType.REMOTE) {
099:                        throw new RemoteException(
100:                                "Reentrant method call detected: "
101:                                        + container.getBeanMetaData()
102:                                                .getEjbName() + " "
103:                                        + ctx.getId().toString());
104:                    } else {
105:                        throw new EJBException(
106:                                "Reentrant method call detected: "
107:                                        + container.getBeanMetaData()
108:                                                .getEjbName() + " "
109:                                        + ctx.getId().toString());
110:                    }
111:                }
112:                try {
113:                    ctx.lock();
114:                    return getNext().invoke(mi);
115:                } finally {
116:                    ctx.unlock();
117:                    methodLock.release(nonReentrant);
118:                }
119:            }
120:
121:            // Private ------------------------------------------------------
122:
123:            private static final Method getEJBHome;
124:            private static final Method getHandle;
125:            private static final Method getPrimaryKey;
126:            private static final Method isIdentical;
127:            private static final Method remove;
128:
129:            static {
130:                try {
131:                    Class[] noArg = new Class[0];
132:                    getEJBHome = EJBObject.class.getMethod("getEJBHome", noArg);
133:                    getHandle = EJBObject.class.getMethod("getHandle", noArg);
134:                    getPrimaryKey = EJBObject.class.getMethod("getPrimaryKey",
135:                            noArg);
136:                    isIdentical = EJBObject.class.getMethod("isIdentical",
137:                            new Class[] { EJBObject.class });
138:                    remove = EJBObject.class.getMethod("remove", noArg);
139:                } catch (Exception e) {
140:                    e.printStackTrace();
141:                    throw new ExceptionInInitializerError(e);
142:                }
143:            }
144:
145:            protected boolean isReentrantMethod(Invocation mi) {
146:                // is this a known non-entrant method
147:                Method m = mi.getMethod();
148:                if (m != null
149:                        && (m.equals(getEJBHome) || m.equals(getHandle)
150:                                || m.equals(getPrimaryKey)
151:                                || m.equals(isIdentical) || m.equals(remove))) {
152:                    return true;
153:                }
154:
155:                // if this is a non-entrant message to the container let it through
156:                if (mi instanceof  CMRInvocation) {
157:                    Entrancy entrancy = ((CMRInvocation) mi).getEntrancy();
158:                    if (entrancy == Entrancy.NON_ENTRANT) {
159:                        log.trace("NON_ENTRANT invocation");
160:                        return true;
161:                    }
162:                }
163:
164:                return false;
165:            }
166:
167:        }
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