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root/i-scream/projects/cms/source/server/uk/org/iscream/cms/server/componentmanager/ComponentManager.java

Comparing projects/cms/source/server/uk/org/iscream/cms/server/componentmanager/ComponentManager.java (file contents):
Revision 1.5 by ajm, Tue Dec 12 20:45:56 2000 UTC vs.
Revision 1.42 by tdb, Wed Feb 5 16:43:46 2003 UTC

#	Line 1 | Line 1
1	+	/*
2	+	* i-scream central monitoring system
3	+	* http://www.i-scream.org.uk
4	+	* Copyright (C) 2000-2002 i-scream
5	+	*
6	+	* This program is free software; you can redistribute it and/or
7	+	* modify it under the terms of the GNU General Public License
8	+	* as published by the Free Software Foundation; either version 2
9	+	* of the License, or (at your option) any later version.
10	+	*
11	+	* This program is distributed in the hope that it will be useful,
12	+	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	+	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14	+	* GNU General Public License for more details.
15	+	*
16	+	* You should have received a copy of the GNU General Public License
17	+	* along with this program; if not, write to the Free Software
18	+	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19	+	*/
20	+
21		//---PACKAGE DECLARATION---
22	<	package uk.ac.ukc.iscream.componentmanager;
22	>	package uk.org.iscream.cms.server.componentmanager;
23
24		//---IMPORTS---
5	–	import uk.ac.ukc.iscream.util.*;
25		import java.util.*;
26		import java.io.*;
27	+	import uk.org.iscream.cms.util.*;
28
29		/**
30		* The component manager is the starting point for all
#	Line 12 | Line 32 | import java.io.*;
32		* It loads its initial system configuration from the
33		* default properties file, it then starts all the iscream
34		* components as specified in the default.properties under
35	<	* uk.ac.ukc.iscream.ComponentList
35	>	* uk.org.iscream.cms.server.ComponentList
36		*
37		* @author  $Author$
38		* @version $Id$
#	Line 38 | Line 58 | public class ComponentManager {
58		*/
59		public static final String DEFAULTPROPERTIES = "./etc/default.properties";
60
61	+	/**
62	+	* The default time to wait before retrying
63	+	* component.
64	+	*/
65	+	public static final int DEFAULT_COMPONENT_START_TIMEOUT = 5;
66	+
67		//---STATIC METHODS---
68
69		/**
#	Line 47 | Line 73 | public class ComponentManager {
73		* @param args the command line arguments
74		*/
75		public static void main(String[] args) {
76	<	System.out.println("--- I-Scream System Component Manager ---");
76	>	System.out.println("-----------------------------------------");
77	>	System.out.println("--- i-scream Server Component Manager ---");
78	>	System.out.println("---   (c) 2001 The i-scream Project   ---");
79	>	System.out.println("---    (http://www.i-scream.org.uk)   ---");
80	>	System.out.println("-----------------------------------------");
81		System.out.println("---          Starting System          ---");
82
83		// get the command line args
54	–	// this is a bit messy and should be looked at
84		String defaultProperties = DEFAULTPROPERTIES;
85		String filterName = null;
86	<	if (args.length > 0) {
87	<	if (args[0].equals("-l")) {
88	<	defaultProperties = args[1];
60	<	} else if (args[0].equals("-f")) {
61	<	filterName = args[1];
62	<	} else if (args[2].equals("-l")) {
63	<	filterName = args[3];
64	<	} else if (args[2].equals("-f")) {
65	<	filterName = args[3];
66	<	} else {
86	>	String filterManagerName = null;
87	>	for(int i=0; i < args.length; i++) {
88	>	if(args[i].equals("-h")) {
89		usage();
90	<	}
90	>	}
91	>	else if(args[i].equals("-f")) {
92	>	if(++i < args.length) {
93	>	filterName = args[i];
94	>	}
95	>	else {
96	>	usage();
97	>	}
98	>	}
99	>	else if(args[i].equals("-fm")) {
100	>	if(++i < args.length) {
101	>	filterManagerName = args[i];
102	>	}
103	>	else {
104	>	usage();
105	>	}
106	>	}
107	>	else if(args[i].equals("-l")) {
108	>	if(++i < args.length) {
109	>	defaultProperties = args[i];
110	>	}
111	>	else {
112	>	usage();
113	>	}
114	>	}
115	>	else {
116	>	usage();
117	>	}
118		}
119
120		// load the default properties file into the system properties
#	Line 90 | Line 139 | public class ComponentManager {
139		refman.activatePOA();
140
141		// get the list of components
142	<	String componentList = System.getProperty("uk.ac.ukc.iscream.ComponentList");
142	>	String componentList = System.getProperty("uk.org.iscream.cms.server.ComponentList");
143		StringTokenizer st = new StringTokenizer(componentList, ";");
144	+	_componentsToStart = new LinkedList();
145
146		// this could be done using reflection
147		// but..well..we don't ;-p
148		while (st.hasMoreTokens()){
149		String componentName = st.nextToken();
150		Component component = null;
101	–	System.out.println(toString + ": starting component - " + componentName);
151
152	+
153		// ### This is where the list of supported components is checked! ###
154		if (componentName.equalsIgnoreCase("core")) {
155	<	component = new uk.ac.ukc.iscream.core.Core();
155	>	component = new uk.org.iscream.cms.server.core.Core();
156	>	// note the passing of the FilterManagers's name in its constructor
157		} else if (componentName.equalsIgnoreCase("filtermanager")) {
158	<	component = new uk.ac.ukc.iscream.filtermanager.FilterManager();
158	>	component = new uk.org.iscream.cms.server.filtermanager.FilterManager(filterManagerName);
159		} else if (componentName.equalsIgnoreCase("rootfilter")) {
160	<	component = new uk.ac.ukc.iscream.rootfilter.RootFilter();
160	>	component = new uk.org.iscream.cms.server.rootfilter.RootFilter();
161		} else if (componentName.equalsIgnoreCase("dbinterface")) {
162	<	component = new uk.ac.ukc.iscream.dbinterface.DBInterface();
162	>	component = new uk.org.iscream.cms.server.dbinterface.DBInterface();
163	>	} else if (componentName.equalsIgnoreCase("clientinterface")) {
164	>	component = new uk.org.iscream.cms.server.clientinterface.ClientInterfaceMain();
165	>	// note the passing of the Filter's name in its constructor
166	>	} else if (componentName.equalsIgnoreCase("filter")) {
167	>	component = new uk.org.iscream.cms.server.filter.FilterMain(filterName);
168	>	} else if (componentName.equalsIgnoreCase("client")) {
169	>	component = new uk.org.iscream.cms.server.client.ClientMain();
170		}
171		// ###  Add new component constructors in the above section! ###
172
173	+	// build the list of components to start
174		if (component != null) {
175	<	try {
117	<	component.start();
118	<	} catch (ComponentStartException e) {
119	<	System.err.println(toString + ": ERROR starting component - " + componentName);
120	<	System.err.println(toString + ": component reports - " + e.getMessage());
121	<	System.exit(1);
122	<	}
175	>	_componentsToStart.add(component);
176		} else {
177	<	System.err.println(toString + ": WARNING unsupported component not started");
177	>	System.err.println(toString + ": WARNING unsupported component not started: "+componentName);
178		}
179		}
180	<	System.out.println(toString + ": running");
181	<
180	>
181	>
182	>
183	>	// get the value for timeout
184	>
185	>	String confTimeout = null;
186	>	try {
187	>	confTimeout = System.getProperty("uk.org.iscream.cms.server.ComponentTimeout");
188	>	confTimeout.trim();
189	>	_startTimeout = Integer.parseInt(confTimeout);
190	>	} catch (NumberFormatException e) {
191	>	_startTimeout = DEFAULT_COMPONENT_START_TIMEOUT;
192	>	System.err.println(toString + ": unable to read uk.org.iscream.cms.server.ComponentTimeout value (" + confTimeout + "), using default!");
193	>	}
194	>	System.out.println(toString + ": using component start timeout of " + _startTimeout + " seconds");
195	>
196	>	// startup the system components
197	>	startUp();
198	>
199		// block on the ORB...in time, management functionality can be placed here.
200	<	refman.getORB().run();
200	>	// if we detect a CORBA communication error, we'll restart all the components.
201	>	// !! this doesn't appear to work !!
202	>	while(true) {
203	>	try {
204	>	refman.getORB().run();
205	>	} catch (org.omg.CORBA.COMM_FAILURE e) {
206	>	System.out.println(toString + ": WARNING CORBA communications failure - " + e.getMessage());
207	>	System.out.println(toString + ": WARNING CORBA connections have been lost - attempting to restart!");
208	>	}
209	>	startUp();
210	>	}
211		}
212
213		/**
214	+	* Starts the components as obtained from the configuration.
215	+	* This method calls the start() methods on all the components.
216	+	* If a component fails to start due to a CORBA communication
217	+	* problem, then it catches this and tries to start it again
218	+	* according to uk.org.iscream.cms.server.ComponentTimeout time.
219	+	*
220	+	* If the server dies and CORBA connections are lost, this method
221	+	* is called again.
222	+	*/
223	+	private static void startUp() {
224	+	// now we try and start the beast up
225	+	boolean tryAgain = true;
226	+	Component component = null;
227	+
228	+	// keep trying until we've started all the components.
229	+	// maybe add support for a limited number of retries
230	+	while(tryAgain) {
231	+	Iterator i = _componentsToStart.iterator();
232	+	LinkedList failedComponents = new LinkedList();
233	+	// go through all the components
234	+	while(i.hasNext()) {
235	+	// get a refence to the component
236	+	component = (Component) i.next();
237	+	System.out.println(toString + ": dependency checking component - " + component.toString());
238	+
239	+	// check it's dependencies
240	+	boolean depOK = component.depCheck();
241	+	if(depOK) {
242	+	System.out.println(toString + ": starting component - " + component.toString());
243	+	// it should be ok to start the component
244	+	try {
245	+	// start the component
246	+	component.start();
247	+	} catch (ComponentStartException e) {
248	+	// if we get this then there was a problem
249	+	// that we can't recover from
250	+	System.err.println(toString + ": ERROR starting component - " + component.toString());
251	+	System.err.println(toString + ": component reports - " + e.getMessage());
252	+	System.exit(1);
253	+	}
254	+	}
255	+	else {
256	+	// it seems the depedencies failed
257	+	// so we want to try again after a delay
258	+	System.err.println(toString + ": WARNING Component reported dependency failure");
259	+	System.err.println(toString + ": This could be because it can't communicate with components it needs.");
260	+
261	+	// make a list of the failed components
262	+	failedComponents.add(component);
263	+	}
264	+	}
265	+
266	+	// if we had some failed components that we can retry
267	+	if (failedComponents.size() > 0) {
268	+	System.err.println(toString + ": WARNING One or more components failed to start correctly.");
269	+	System.err.println(toString + ": Will try again in " + _startTimeout + " seconds");
270	+
271	+	// our list is now the failed list
272	+	_componentsToStart = failedComponents;
273	+
274	+	// sleep for a given timeout
275	+	try {
276	+	Thread.sleep(_startTimeout * 1000);
277	+	} catch (InterruptedException e) {
278	+	// we're not bothered
279	+	}
280	+	// otherwise we started everything
281	+	} else {
282	+	// so we set to exit the loop
283	+	tryAgain = false;
284	+	}
285	+	}
286	+
287	+	System.out.println(toString + ": running");
288	+	}
289	+
290	+	/**
291		* A simple method to print the usage of this class.
292		* It never returns, but instead exits to the system
293		* with a value 1, to indicate the system did not start
294		* properly.
295		*/
296		public static void usage() {
297	<	System.out.println("USAGE: java uk.ac.ukc.iscream.componentmanager.ComponentManager <option>");
297	>	System.out.println("USAGE: java uk.org.iscream.cms.server.componentmanager.ComponentManager <option>");
298	>	System.out.println("   or: java -jar iscream.jar <option>");
299		System.out.println("WHERE <option>:");
300		System.out.println("      -l <filename> - the location of initial system properties");
301		System.out.println("                      the default is ./etc/default.properties");
302		System.out.println("      -f <name>     - the name of the filter (if there is one configured");
303	+	System.out.println("      -fm <name>    - the name of the filter manager (if there is one configured");
304		System.out.println("      -h            - this help screen");
305		System.exit(1);
306		}
#	Line 157 | Line 316 | public class ComponentManager {
316		//---ATTRIBUTES---
317
318		//---STATIC ATTRIBUTES---
319	+
320	+	private static LinkedList _componentsToStart;
321	+	private static int _startTimeout = 0;
322
323		}

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