01: /*
02: * JBoss, Home of Professional Open Source
03: * Copyright 2005, JBoss Inc., and individual contributors as indicated
04: * by the @authors tag. See the copyright.txt in the distribution for a
05: * full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * published by the Free Software Foundation; either version 2.1 of
10: * the License, or (at your option) any later version.
11: *
12: * This software is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public
18: * License along with this software; if not, write to the Free
19: * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21: */
22: package org.jbpm.command.impl;
23:
24: import java.io.Serializable;
25:
26: import org.apache.commons.logging.Log;
27: import org.apache.commons.logging.LogFactory;
28: import org.jbpm.JbpmConfiguration;
29: import org.jbpm.JbpmContext;
30: import org.jbpm.JbpmException;
31: import org.jbpm.command.Command;
32: import org.jbpm.command.CommandService;
33:
34: /**
35: * Provide services for accessing the jBPM engine. Access is currently provided
36: * through a set of {@link org.jbpm.command.Command} derived operations.
37: *
38: * @author Jim Rigsbee, Tom Baeyens
39: */
40: public class CommandServiceImpl implements CommandService, Serializable {
41:
42: private static final long serialVersionUID = 1L;
43:
44: protected JbpmConfiguration jbpmConfiguration = null;
45:
46: /**
47: * Establish an instance of the command service with a particular jBPM
48: * configuration which provides connectivity to the jBPM engine and its
49: * related services including the persistence manager.
50: *
51: * @param jbpmConfiguration
52: * jBPM Configuration
53: */
54: public CommandServiceImpl(JbpmConfiguration jbpmConfiguration) {
55: this .jbpmConfiguration = jbpmConfiguration;
56: }
57:
58: /**
59: * Executes command based on its current context. Each command contains the
60: * appropriate context information such as token, process instance, etc. to
61: * insure that the operation is carried out on the proper graph object.
62: *
63: * @param command
64: * jBPM engine command to execute
65: */
66: public Object execute(Command command) {
67: Object result = null;
68: JbpmContext jbpmContext = jbpmConfiguration.createJbpmContext();
69: try {
70: log.debug("executing " + command);
71: result = command.execute(jbpmContext);
72: } catch (Exception e) {
73: throw new JbpmException("couldn't execute " + command, e);
74: } finally {
75: jbpmContext.close();
76: }
77: return result;
78: }
79:
80: private static final Log log = LogFactory
81: .getLog(CommandServiceImpl.class);
82: }
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