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Java > Open Source Codes > com > caucho > server > deploy > StartLazyRedeployManualStrategy


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  *
23  * Free Software Foundation, Inc.
24  * 59 Temple Place, Suite 330
25  * Boston, MA 02111-1307 USA
26  *
27  * @author Scott Ferguson
28  */
29
30 package com.caucho.server.deploy;
31
32 /**
33  * The start-mode="lazy", redeploy-model="manual" controller strategy.
34  *
35  * initial state = stop
36  *
37  * <table>
38  * <tr><th>input <th>stopped <th>active <th>modified <th>error
39  * <tr><td>start <td>startImpl<td>- <td>restartImpl<td>restartImpl
40  * <tr><td>update <td>startImpl<td>- <td>restartImpl<td>restartImpl
41  * <tr><td>stop <td>- <td>stopImpl<td>stopImpl <td>stopImpl
42  * <tr><td>request<td>- <td>- <td>- <td>-
43  * <tr><td>include<td>- <td>- <td>- <td>-
44  * <tr><td>alarm <td>- <td>- <td>- <td>-
45  * </table>
46  */
47 public class StartLazyRedeployManualStrategy
48   extends StartManualRedeployManualStrategy {
49   private final static StartLazyRedeployManualStrategy STRATEGY =
50           new StartLazyRedeployManualStrategy();
51
52   private StartLazyRedeployManualStrategy()
53   {
54   }
55
56   /**
57    * Returns the start="lazy" redeploy="automatic" strategy
58    *
59    * @return the singleton strategy
60    */
61   public static DeployControllerStrategy create()
62   {
63     return STRATEGY;
64   }
65   
66   /**
67    * Called at initialization time for automatic start.
68    *
69    * @param controller the owning controller
70    */
71   public<I extends DeployInstance>
72     void startOnInit(DeployController<I> controller)
73   {
74     controller.stopLazyImpl();
75   }
76
77   /**
78    * Returns the current instance, redeploying if necessary.
79    *
80    * @param controller the owning controller
81    * @return the current deploy instance
82    */
83   public <I extends DeployInstance>
84           I request(DeployController<I> controller)
85   {
86     if (controller.isStoppedLazy()) {
87       return controller.startImpl();
88     }
89     else if (controller.isStopped()) {
90       return controller.getDeployInstance();
91     }
92     else {
93       return controller.getDeployInstance();
94     }
95   }
96
97   /**
98    * Returns the current instance, starting if necessary.
99    *
100    * @param controller the owning controller
101    * @return the current deploy instance
102    */
103   public <I extends DeployInstance>
104           I subrequest(DeployController<I> controller)
105   {
106     if (controller.isStoppedLazy()) {
107       return controller.startImpl();
108     }
109     else if (controller.isStopped()) {
110       return controller.getDeployInstance();
111     }
112     else { /* active */
113       // server/1d0d
114 return controller.getDeployInstance();
115     }
116   }
117 }
118
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