commands/servlet/CreateAction.java

/*
 * $Id$
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.struts.chain.commands.servlet;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.chain.Constants;
import org.apache.struts.chain.commands.util.ClassUtils;
import org.apache.struts.chain.contexts.ActionContext;
import org.apache.struts.chain.contexts.ServletActionContext;
import org.apache.struts.config.ActionConfig;
import org.apache.struts.config.ModuleConfig;

import java.util.HashMap;
import java.util.Map;

/**
 * <p>Concrete implementation of <code>AbstractCreateAction</code> for use in
 * a Servlet API chain.  Expects that the ActionContext passed into it can
 * safely be cast to <code>ServletActionContext</code>.</p>
 */
public class CreateAction
    extends org.apache.struts.chain.commands.AbstractCreateAction {
    // ------------------------------------------------------ Instance Variables
    private static final Log log = LogFactory.getLog(CreateAction.class);

    /* :TODO The Action class' dependency on having its "servlet" property set
     * requires this API-dependent subclass of AbstractCreateAction.
     */
    protected synchronized Action getAction(ActionContext context, String type,
        ActionConfig actionConfig)
        throws Exception {

        ServletActionContext saContext = (ServletActionContext) context;
        ActionServlet actionServlet = saContext.getActionServlet();

        ModuleConfig moduleConfig = actionConfig.getModuleConfig();
        String actionsKey = Constants.ACTIONS_KEY + moduleConfig.getPrefix();
        Map actions = (Map) context.getApplicationScope().get(actionsKey);

        if (actions == null) {
            actions = new HashMap();
            context.getApplicationScope().put(actionsKey, actions);
        }

        Action action = null;

        try {
            if (actionConfig.isSingleton()) {
                synchronized (actions) {
                    action = (Action) actions.get(type);
                    if (action == null) {
                        action = createAction(context, type);
                        actions.put(type, action);
                    }
                }
            } else {
                action = createAction(context, type);
            }
        } catch (Exception e) {
            log.error(actionServlet.getInternal().getMessage(
                    "actionCreate", actionConfig.getPath(), 
                    actionConfig.toString()), e);
            throw e;
        }
        
        if (action.getServlet() == null) {
            action.setServlet(actionServlet);
        }

        return (action);
    }
    
    /**
     * <p>Invoked by <code>getAction</code> when the <code>Action</code> 
     * actually has to be created. If the instance is already created and 
     * cached, this method will not be called. </p>
     * 
     * @param context      The <code>Context</code> for this request
     * @param type         Name of class to instantiate
     * @return Instantiated Action class
     * @throws Exception if there are any problems instantiating the Action
     *                   class.
     * @since Struts 1.3.7
     */
    protected Action createAction(ActionContext context, String type) throws Exception {
        log.info("Initialize action of type: " + type);
        return (Action) ClassUtils.getApplicationInstance(type);
    }
}
1	wsmoak	421119	/*
2			* $Id$
3			*
4	husted	471754	* Licensed to the Apache Software Foundation (ASF) under one
5			* or more contributor license agreements. See the NOTICE file
6			* distributed with this work for additional information
7			* regarding copyright ownership. The ASF licenses this file
8			* to you under the Apache License, Version 2.0 (the
9			* "License"); you may not use this file except in compliance
10			* with the License. You may obtain a copy of the License at
11	wsmoak	421119	*
12	husted	471754	* http://www.apache.org/licenses/LICENSE-2.0
13	wsmoak	421119	*
14	husted	471754	* Unless required by applicable law or agreed to in writing,
15			* software distributed under the License is distributed on an
16			* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17			* KIND, either express or implied. See the License for the
18			* specific language governing permissions and limitations
19			* under the License.
20	wsmoak	421119	*/
21			package org.apache.struts.chain.commands.servlet;
22
23			import org.apache.commons.logging.Log;
24			import org.apache.commons.logging.LogFactory;
25			import org.apache.struts.action.Action;
26			import org.apache.struts.action.ActionServlet;
27			import org.apache.struts.chain.Constants;
28			import org.apache.struts.chain.commands.util.ClassUtils;
29			import org.apache.struts.chain.contexts.ActionContext;
30			import org.apache.struts.chain.contexts.ServletActionContext;
31			import org.apache.struts.config.ActionConfig;
32			import org.apache.struts.config.ModuleConfig;
33
34			import java.util.HashMap;
35			import java.util.Map;
36
37			/**
38			* <p>Concrete implementation of <code>AbstractCreateAction</code> for use in
39			* a Servlet API chain. Expects that the ActionContext passed into it can
40			* safely be cast to <code>ServletActionContext</code>.</p>
41			*/
42			public class CreateAction
43			extends org.apache.struts.chain.commands.AbstractCreateAction {
44			// ------------------------------------------------------ Instance Variables
45			private static final Log log = LogFactory.getLog(CreateAction.class);
46
47			/* :TODO The Action class' dependency on having its "servlet" property set
48			* requires this API-dependent subclass of AbstractCreateAction.
49			*/
50			protected synchronized Action getAction(ActionContext context, String type,
51			ActionConfig actionConfig)
52			throws Exception {
53	pbenedict	553061
54			ServletActionContext saContext = (ServletActionContext) context;
55			ActionServlet actionServlet = saContext.getActionServlet();
56
57	wsmoak	421119	ModuleConfig moduleConfig = actionConfig.getModuleConfig();
58			String actionsKey = Constants.ACTIONS_KEY + moduleConfig.getPrefix();
59			Map actions = (Map) context.getApplicationScope().get(actionsKey);
60
61			if (actions == null) {
62			actions = new HashMap();
63			context.getApplicationScope().put(actionsKey, actions);
64			}
65
66			Action action = null;
67
68	pbenedict	554496	try {
69			if (actionConfig.isSingleton()) {
70			synchronized (actions) {
71			action = (Action) actions.get(type);
72			if (action == null) {
73			action = createAction(context, type);
74			actions.put(type, action);
75			}
76	pbenedict	553061	}
77	pbenedict	554496	} else {
78			action = createAction(context, type);
79	wsmoak	421119	}
80	pbenedict	554496	} catch (Exception e) {
81			log.error(actionServlet.getInternal().getMessage(
82			"actionCreate", actionConfig.getPath(),
83			actionConfig.toString()), e);
84			throw e;
85	wsmoak	421119	}
86	pbenedict	554496
87	wsmoak	421119	if (action.getServlet() == null) {
88			action.setServlet(actionServlet);
89			}
90
91			return (action);
92			}
93	bayard	521984
94			/**
95			* <p>Invoked by <code>getAction</code> when the <code>Action</code>
96			* actually has to be created. If the instance is already created and
97			* cached, this method will not be called. </p>
98			*
99			* @param context The <code>Context</code> for this request
100			* @param type Name of class to instantiate
101			* @return Instantiated Action class
102			* @throws Exception if there are any problems instantiating the Action
103			* class.
104			* @since Struts 1.3.7
105			*/
106			protected Action createAction(ActionContext context, String type) throws Exception {
107			log.info("Initialize action of type: " + type);
108			return (Action) ClassUtils.getApplicationInstance(type);
109			}
110	wsmoak	421119	}
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