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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 1.18 by ajm, Fri Feb 23 16:38:03 2001 UTC vs.
Revision 1.40 by tdb, Sat May 18 18:16:01 2002 UTC

#	Line 1 | Line 1
1	+	/*
2	+	* i-scream central monitoring system
3	+	* Copyright (C) 2000-2002 i-scream
4	+	*
5	+	* This program is free software; you can redistribute it and/or
6	+	* modify it under the terms of the GNU General Public License
7	+	* as published by the Free Software Foundation; either version 2
8	+	* of the License, or (at your option) any later version.
9	+	*
10	+	* This program is distributed in the hope that it will be useful,
11	+	* but WITHOUT ANY WARRANTY; without even the implied warranty of
12	+	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13	+	* GNU General Public License for more details.
14	+	*
15	+	* You should have received a copy of the GNU General Public License
16	+	* along with this program; if not, write to the Free Software
17	+	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
18	+	*/
19	+
20		//---PACKAGE DECLARATION---
21	<	package uk.ac.ukc.iscream.componentmanager;
21	>	package uk.org.iscream.cms.server.componentmanager;
22
23		//---IMPORTS---
24		import java.util.*;
25		import java.io.*;
26	<	import uk.ac.ukc.iscream.util.*;
26	>	import uk.org.iscream.cms.server.util.*;
27
28		/**
29		* The component manager is the starting point for all
#	Line 12 | Line 31 | import uk.ac.ukc.iscream.util.*;
31		* It loads its initial system configuration from the
32		* default properties file, it then starts all the iscream
33		* components as specified in the default.properties under
34	<	* uk.ac.ukc.iscream.ComponentList
34	>	* uk.org.iscream.cms.server.ComponentList
35		*
36		* @author  $Author$
37		* @version $Id$
#	Line 38 | Line 57 | public class ComponentManager {
57		*/
58		public static final String DEFAULTPROPERTIES = "./etc/default.properties";
59
60	+	/**
61	+	* The default time to wait before retrying
62	+	* component.
63	+	*/
64	+	public static final int DEFAULT_COMPONENT_START_TIMEOUT = 5;
65	+
66		//---STATIC METHODS---
67
68		/**
#	Line 47 | Line 72 | public class ComponentManager {
72		* @param args the command line arguments
73		*/
74		public static void main(String[] args) {
75	+	System.out.println("-----------------------------------------");
76		System.out.println("--- i-scream Server Component Manager ---");
77	+	System.out.println("---   (c) 2001 The i-scream Project   ---");
78	+	System.out.println("---    (http://www.i-scream.org.uk)   ---");
79	+	System.out.println("-----------------------------------------");
80		System.out.println("---          Starting System          ---");
81
82		// get the command line args
83		String defaultProperties = DEFAULTPROPERTIES;
84		String filterName = null;
85	+	String filterManagerName = null;
86		for(int i=0; i < args.length; i++) {
87		if(args[i].equals("-h")) {
88		usage();
89		}
90		else if(args[i].equals("-f")) {
91	<	i++; filterName = args[i];
91	>	if(++i < args.length) {
92	>	filterName = args[i];
93	>	}
94	>	else {
95	>	usage();
96	>	}
97		}
98	+	else if(args[i].equals("-fm")) {
99	+	if(++i < args.length) {
100	+	filterManagerName = args[i];
101	+	}
102	+	else {
103	+	usage();
104	+	}
105	+	}
106		else if(args[i].equals("-l")) {
107	<	i++; defaultProperties = args[i];
107	>	if(++i < args.length) {
108	>	defaultProperties = args[i];
109	>	}
110	>	else {
111	>	usage();
112	>	}
113		}
114		else {
115		usage();
#	Line 90 | Line 138 | public class ComponentManager {
138		refman.activatePOA();
139
140		// get the list of components
141	<	String componentList = System.getProperty("uk.ac.ukc.iscream.ComponentList");
141	>	String componentList = System.getProperty("uk.org.iscream.cms.server.ComponentList");
142		StringTokenizer st = new StringTokenizer(componentList, ";");
143	+	_componentsToStart = new LinkedList();
144
96	–
97	–	ArrayList componentsToStart = new ArrayList();
98	–
145		// this could be done using reflection
146		// but..well..we don't ;-p
147		while (st.hasMoreTokens()){
#	Line 105 | Line 151 | public class ComponentManager {
151
152		// ### This is where the list of supported components is checked! ###
153		if (componentName.equalsIgnoreCase("core")) {
154	<	component = new uk.ac.ukc.iscream.core.Core();
154	>	component = new uk.org.iscream.cms.server.core.Core();
155	>	// note the passing of the FilterManagers's name in its constructor
156		} else if (componentName.equalsIgnoreCase("filtermanager")) {
157	<	component = new uk.ac.ukc.iscream.filtermanager.FilterManager();
157	>	component = new uk.org.iscream.cms.server.filtermanager.FilterManager(filterManagerName);
158		} else if (componentName.equalsIgnoreCase("rootfilter")) {
159	<	component = new uk.ac.ukc.iscream.rootfilter.RootFilter();
159	>	component = new uk.org.iscream.cms.server.rootfilter.RootFilter();
160		} else if (componentName.equalsIgnoreCase("dbinterface")) {
161	<	component = new uk.ac.ukc.iscream.dbinterface.DBInterface();
161	>	component = new uk.org.iscream.cms.server.dbinterface.DBInterface();
162		} else if (componentName.equalsIgnoreCase("clientinterface")) {
163	<	component = new uk.ac.ukc.iscream.clientinterface.ClientInterfaceMain();
163	>	component = new uk.org.iscream.cms.server.clientinterface.ClientInterfaceMain();
164		// note the passing of the Filter's name in its constructor
165		} else if (componentName.equalsIgnoreCase("filter")) {
166	<	component = new uk.ac.ukc.iscream.filter.FilterMain(filterName);
166	>	component = new uk.org.iscream.cms.server.filter.FilterMain(filterName);
167	>	} else if (componentName.equalsIgnoreCase("client")) {
168	>	component = new uk.org.iscream.cms.server.client.ClientMain();
169		}
170		// ###  Add new component constructors in the above section! ###
171
172	+	// build the list of components to start
173		if (component != null) {
174	<	componentsToStart.add(component);
174	>	_componentsToStart.add(component);
175		} else {
176	<	System.err.println(toString + ": WARNING unsupported component not started");
176	>	System.err.println(toString + ": WARNING unsupported component not started: "+componentName);
177		}
178		}
179
180	+
181	+
182	+	// get the value for timeout
183	+
184	+	String confTimeout = null;
185	+	try {
186	+	confTimeout = System.getProperty("uk.org.iscream.cms.server.ComponentTimeout");
187	+	confTimeout.trim();
188	+	_startTimeout = Integer.parseInt(confTimeout);
189	+	} catch (NumberFormatException e) {
190	+	_startTimeout = DEFAULT_COMPONENT_START_TIMEOUT;
191	+	System.err.println(toString + ": unable to read uk.org.iscream.cms.server.ComponentTimeout value (" + confTimeout + "), using default!");
192	+	}
193	+	System.out.println(toString + ": using component start timeout of " + _startTimeout + " seconds");
194	+
195	+	// startup the system components
196	+	startUp();
197	+
198	+	// block on the ORB...in time, management functionality can be placed here.
199	+	// if we detect a CORBA communication error, we'll restart all the components.
200	+	// !! this doesn't appear to work !!
201	+	while(true) {
202	+	try {
203	+	refman.getORB().run();
204	+	} catch (org.omg.CORBA.COMM_FAILURE e) {
205	+	System.out.println(toString + ": WARNING CORBA communications failure - " + e.getMessage());
206	+	System.out.println(toString + ": WARNING CORBA connections have been lost - attempting to restart!");
207	+	}
208	+	startUp();
209	+	}
210	+	}
211	+
212	+	/**
213	+	* Starts the components as obtained from the configuration.
214	+	* This method calls the start() methods on all the components.
215	+	* If a component fails to start due to a CORBA communication
216	+	* problem, then it catches this and tries to start it again
217	+	* according to uk.org.iscream.cms.server.ComponentTimeout time.
218	+	*
219	+	* If the server dies and CORBA connections are lost, this method
220	+	* is called again.
221	+	*/
222	+	private static void startUp() {
223	+	// now we try and start the beast up
224		boolean tryAgain = true;
225		Component component = null;
226	+
227	+	// keep trying until we've started all the components.
228	+	// maybe add support for a limited number of retries
229		while(tryAgain) {
230	<	Iterator i = componentsToStart.iterator();
230	>	Iterator i = _componentsToStart.iterator();
231	>	LinkedList failedComponents = new LinkedList();
232	>	// go through all the components
233		while(i.hasNext()) {
234	<	try {
235	<	component = (Component) i.next();
234	>	// get a refence to the component
235	>	component = (Component) i.next();
236	>	System.out.println(toString + ": dependency checking component - " + component.toString());
237	>
238	>	// check it's dependencies
239	>	boolean depOK = component.depCheck();
240	>	if(depOK) {
241		System.out.println(toString + ": starting component - " + component.toString());
242	<	component.start();
243	<	componentsToStart.remove(componentsToStart.indexOf(component));
244	<	} catch (ComponentStartException e) {
245	<	System.err.println(toString + ": ERROR starting component - " + component.toString());
246	<	System.err.println(toString + ": component reports - " + e.getMessage());
247	<	System.exit(1);
248	<	} catch(ComponentCORBAException e2) {
249	<	System.err.println(toString + ": WARNING Component reported CORBA communications failure");
242	>	// it should be ok to start the component
243	>	try {
244	>	// start the component
245	>	component.start();
246	>	} catch (ComponentStartException e) {
247	>	// if we get this then there was a problem
248	>	// that we can't recover from
249	>	System.err.println(toString + ": ERROR starting component - " + component.toString());
250	>	System.err.println(toString + ": component reports - " + e.getMessage());
251	>	System.exit(1);
252	>	}
253	>	}
254	>	else {
255	>	// it seems the depedencies failed
256	>	// so we want to try again after a delay
257	>	System.err.println(toString + ": WARNING Component reported dependency failure");
258		System.err.println(toString + ": This could be because it can't communicate with components it needs.");
259	<	System.err.println(toString + ": component reports - " + e2.getMessage());
259	>
260	>	// make a list of the failed components
261	>	failedComponents.add(component);
262		}
263		}
264	<	if (componentsToStart.size() > 0) {
264	>
265	>	// if we had some failed components that we can retry
266	>	if (failedComponents.size() > 0) {
267		System.err.println(toString + ": WARNING One or more components failed to start correctly.");
268	<	System.err.println(toString + ": Will try again in 5 seconds");
268	>	System.err.println(toString + ": Will try again in " + _startTimeout + " seconds");
269	>
270	>	// our list is now the failed list
271	>	_componentsToStart = failedComponents;
272	>
273	>	// sleep for a given timeout
274		try {
275	<	Thread.sleep(5000);
275	>	Thread.sleep(_startTimeout * 1000);
276		} catch (InterruptedException e) {
277		// we're not bothered
278		}
279	+	// otherwise we started everything
280		} else {
281	+	// so we set to exit the loop
282		tryAgain = false;
283		}
284		}
285
286		System.out.println(toString + ": running");
287	+	}
288
165	–	// block on the ORB...in time, management functionality can be placed here.
166	–	refman.getORB().run();
167	–	}
168	–
289		/**
290		* A simple method to print the usage of this class.
291		* It never returns, but instead exits to the system
#	Line 173 | Line 293 | public class ComponentManager {
293		* properly.
294		*/
295		public static void usage() {
296	<	System.out.println("USAGE: java uk.ac.ukc.iscream.componentmanager.ComponentManager <option>");
296	>	System.out.println("USAGE: java uk.org.iscream.cms.server.componentmanager.ComponentManager <option>");
297		System.out.println("   or: java -jar iscream.jar <option>");
298		System.out.println("WHERE <option>:");
299		System.out.println("      -l <filename> - the location of initial system properties");
300		System.out.println("                      the default is ./etc/default.properties");
301		System.out.println("      -f <name>     - the name of the filter (if there is one configured");
302	+	System.out.println("      -fm <name>    - the name of the filter manager (if there is one configured");
303		System.out.println("      -h            - this help screen");
304		System.exit(1);
305		}
#	Line 194 | Line 315 | public class ComponentManager {
315		//---ATTRIBUTES---
316
317		//---STATIC ATTRIBUTES---
318	+
319	+	private static LinkedList _componentsToStart;
320	+	private static int _startTimeout = 0;
321
322		}

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