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;
23:
24: import org.jbpm.JbpmException;
25: import org.jbpm.command.Command;
26:
27: /**
28: * Provides jBPM engine services.
29: *
30: * @author Jim Rigsbee, Tom Baeyens
31: */
32: public interface CommandService {
33:
34: /**
35: * is the session facade that takes commands and executes them. The CommandService
36: * is responsible for creating or obtaining the JbpmContext. The JbpmContext
37: * will be passed to the commands as a parameter. In a transactional environment,
38: * the execute method demarcates a transaction. The command can be executed remotely and/or
39: * asynchronously.
40: *
41: * @param command
42: * engine command to execute
43: * @return an object. The types of objects is determined by the command implementation.
44: * See those docs for more details on the return object.
45: * @throws JbpmException
46: */
47: public Object execute(Command command);
48:
49: }
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