Source Code Cross Referenced for J2EERemoteClient.java in  » Workflow-Engines » obe-1.0 » org » obe » client » api » rmi » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » obe 1.0 » org.obe.client.api.rmi 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*--
002:
003:         Copyright (C) 2002-2005 Adrian Price.
004:         All rights reserved.
005:
006:         Redistribution and use in source and binary forms, with or without
007:         modification, are permitted provided that the following conditions
008:         are met:
009:
010:         1. Redistributions of source code must retain the above copyright
011:            notice, this list of conditions, and the following disclaimer.
012:
013:         2. Redistributions in binary form must reproduce the above copyright
014:            notice, this list of conditions, and the disclaimer that follows
015:            these conditions in the documentation and/or other materials
016:            provided with the distribution.
017:
018:         3. The names "OBE" and "Open Business Engine" must not be used to
019:         	endorse or promote products derived from this software without prior
020:         	written permission.  For written permission, please contact
021:         	adrianprice@sourceforge.net.
022:
023:         4. Products derived from this software may not be called "OBE" or
024:         	"Open Business Engine", nor may "OBE" or "Open Business Engine"
025:         	appear in their name, without prior written permission from
026:         	Adrian Price (adrianprice@users.sourceforge.net).
027:
028:         THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
029:         WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
030:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
031:         DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
032:         INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
033:         (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
034:         SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
035:         HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
036:         STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
037:         IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
038:         POSSIBILITY OF SUCH DAMAGE.
039:
040:         For more information on OBE, please see
041:         <http://obe.sourceforge.net/>.
042:
043:         */
044:
045:        package org.obe.client.api.rmi;
046:
047:        import org.apache.commons.logging.Log;
048:        import org.apache.commons.logging.LogFactory;
049:        import org.obe.client.api.WMClientFactory;
050:        import org.obe.client.api.base.WorkflowEngineIntf;
051:        import org.wfmc.wapi.WMConnectException;
052:        import org.wfmc.wapi.WMConnectInfo;
053:        import org.wfmc.wapi.WMWorkflowException;
054:
055:        import javax.ejb.CreateException;
056:        import javax.ejb.EJBObject;
057:        import javax.naming.Context;
058:        import javax.naming.NamingException;
059:        import javax.rmi.PortableRemoteObject;
060:        import java.security.PrivilegedExceptionAction;
061:
062:        /**
063:         * Class used to connect to and communicate with a workflow engine via RMI-RPC.
064:         * To use this client, please ensure that JNDI is configured with the correct
065:         * InitialContextFactory (set in jndi.properties, or as a system property).
066:         * <p/>
067:         * This interface is based on the WfMC's Interface 2 Client API specification.
068:         * Some of the methods have been modified from the original specification to fit
069:         * within the normal design of Java applications. For instance, the WfMC
070:         * specification functions always return an error object (even for success) and
071:         * uses out parameters to return values. This interface returns the value and
072:         * throws an exception when an error occurs. If no error occurs then an
073:         * exception is not thrown.
074:         *
075:         * @author Adrian Price
076:         */
077:        public final class J2EERemoteClient extends AbstractJ2EEClient {
078:            private static final Log _logger = LogFactory
079:                    .getLog(J2EERemoteClient.class);
080:
081:            public J2EERemoteClient() {
082:            }
083:
084:            protected Log getLogger() {
085:                return _logger;
086:            }
087:
088:            public String getProtocol() {
089:                return WMClientFactory.RMI;
090:            }
091:
092:            public synchronized void connect(WMConnectInfo connectInfo)
093:                    throws WMConnectException {
094:                try {
095:                    final Context ctx = _connect(connectInfo);
096:                    PrivilegedExceptionAction action = new PrivilegedExceptionAction() {
097:                        public Object run() throws Exception {
098:                            try {
099:                                // Look up J2EEServer's remote home.
100:                                Object obj = ctx
101:                                        .lookup(J2EEServerRemoteHome.JNDI_NAME);
102:                                J2EEServerRemoteHome home = (J2EEServerRemoteHome) PortableRemoteObject
103:                                        .narrow(obj, J2EEServerRemoteHome.class);
104:                                return home.create();
105:                            } catch (CreateException e) {
106:                                throw new WMConnectException(e);
107:                            } finally {
108:                                try {
109:                                    ctx.close();
110:                                } catch (NamingException e) {
111:                                    _logger.error("Error closing JNDI context");
112:                                }
113:                            }
114:                        }
115:                    };
116:                    _engine = (WorkflowEngineIntf) doAsSubject(action);
117:                } catch (WMConnectException e) {
118:                    throw e;
119:                } catch (WMWorkflowException e) {
120:                    throw new WMConnectException(e);
121:                }
122:            }
123:
124:            public synchronized void disconnect() throws WMConnectException {
125:                try {
126:                    PrivilegedExceptionAction action = new PrivilegedExceptionAction() {
127:                        public Object run() throws Exception {
128:                            try {
129:                                ((EJBObject) _engine).remove();
130:                            } catch (Exception e) {
131:                                getLogger().error("Remove exception", e);
132:                            } finally {
133:                                J2EERemoteClient.super .disconnect();
134:                            }
135:                            return null;
136:                        }
137:                    };
138:                    doAsSubject(action);
139:                } catch (WMConnectException e) {
140:                    throw e;
141:                } catch (WMWorkflowException e) {
142:                    throw new WMConnectException(e);
143:                } finally {
144:                    _engine = null;
145:                }
146:            }
147:        }
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