server/rootfilter/RootFilter.java


//---PACKAGE DECLARATION---
package uk.ac.ukc.iscream.rootfilter;

//---IMPORTS---
import uk.ac.ukc.iscream.util.*;
import uk.ac.ukc.iscream.core.*;
import uk.ac.ukc.iscream.componentmanager.*;
import uk.ac.ukc.iscream.clientinterface.*;

/**
 * The root filter is what all filters talk to
 * Hosts cannot talk to this implementation of a filter.
 * It provides hooks to all data interfaces for the system
 * namely the client interface and the db interface.
 * This is an i-scream component that starts the
 * RootFilter services.
 *
 * @author  $Author: tdb1 $
 * @version $Id: RootFilter.java,v 1.30 2001/03/14 01:43:58 tdb1 Exp $
 */
public class RootFilter implements Component {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public static final String REVISION = "$Revision: 1.30 $";

//---STATIC METHODS---

//---CONSTRUCTORS---

//---PUBLIC METHODS---

    /**
     * This starts the Root Filter for the system
     */
    public void start() throws ComponentStartException {
        // get references to key objects
        _logger = _refman.getLogger();
        
        _logger.write(toString(), Logger.SYSINIT, "coming up");
        
        ConfigurationProxy cp = ConfigurationProxy.getInstance();
        String configName = "RootFilter";
        
        // set the name of the root filter
        try {
            NAME = cp.getProperty(configName, "RootFilter.name");
        } catch (PropertyNotFoundException e) {
            NAME = null;
            _logger.write(toString(), Logger.WARNING, "RootFilter name not set: "+e);
        }
        
        // try and get the names of the ciReal and ciDB
        String realInterface, dbInterface;
        try {
            realInterface = cp.getProperty(configName, "RootFilter.realtimeInterfaceName");
            dbInterface = cp.getProperty(configName, "RootFilter.dbInterfaceName");
        } catch (PropertyNotFoundException e) {
            _logger.write(toString(), Logger.DEBUG, "Optional config not set: "+e);
            realInterface = null;
            dbInterface = null;
        }
        
        ClientInterface ciReal = null, ciDB = null;
        // get reference to the client interfaces - the real time one
        if (realInterface != null) {
            ciReal = ClientInterfaceHelper.narrow(_refman.getCORBARef("iscream.ClientInterface." + realInterface));
        }
        // get reference to the client interfaces - and the db one
        if (dbInterface != null) {
            ciDB = ClientInterfaceHelper.narrow(_refman.getCORBARef("iscream.ClientInterface." + dbInterface));
        }

        // setup a queue
        Queue queue = new Queue();
        
        // startup a monitor on this queue
        try {
            // try to get the interval, if this fails, we won't start up the monitor
            int queueMonitorInterval = Integer.parseInt(cp.getProperty(configName, "Queue.MonitorInterval"));
            String queueName = NAME + " RootFilter";
            queue.startMonitor(queueMonitorInterval*1000, queueName);
        } catch (PropertyNotFoundException e) {
            _logger.write(toString(), Logger.WARNING, "failed to find queue monitor config, disabling. " + e);
        }
        
        if (realInterface == null) {        
            _logger.write(toString(), Logger.DEBUG, "hooked to interfaces - " + dbInterface);
            CIWrapper c = new CIWrapper(ciDB, queue);
            c.start();
        } else if (dbInterface == null) {
            _logger.write(toString(), Logger.DEBUG, "hooked to interfaces - " + realInterface);
            CIWrapper c = new CIWrapper(ciReal, queue);
            c.start();
        } else {
            _logger.write(toString(), Logger.DEBUG, "hooked to interfaces - " + realInterface + " & " + dbInterface);
            CIWrapper c = new CIWrapper(ciReal, queue);
            c.start();
            c = new CIWrapper(ciDB, queue);
            c.start();
        }
                
        // RootFilterServant start (for inbound child filter data)
        _logger.write(toString(), Logger.DEBUG, "starting Root Filter");
        RootFilterServant filterServant = new RootFilterServant(queue);
        // bind to the naming service as a filter
        _refman.bindToOrb(filterServant, "iscream.Filter." + RootFilter.NAME);
        
        _logger.write(toString(), Logger.SYSINIT, "started");
        
    }
    
    /**
     * Does a dependency check. Used mainly at startup to
     * see if the required dependencies (components) are up
     * and running.
     *
     * @return a boolean value, true if the depdencies are satisfied
     */
    public boolean depCheck() {
        try {
            org.omg.CORBA.Object obj;
            // first check the ConfigurationManager is alive
            obj = _refman.getCORBARef("iscream.ConfigurationManager");
            // then get some info on the CLI and DBI
            ConfigurationProxy cp = ConfigurationProxy.getInstance();
            String cli = cp.getProperty("RootFilter", "RootFilter.realtimeInterfaceName");
            String dbi = cp.getProperty("RootFilter", "RootFilter.dbInterfaceName");
            // finally check the CLI and DBI are alive
            obj = _refman.getCORBARef("iscream.ClientInterface." + cli);
            obj = _refman.getCORBARef("iscream.ClientInterface." + dbi);
        } catch(ComponentCORBAException e) {
            System.err.println(toString() + ": Dependency Failure: "+e);
            return false;
        } catch(PropertyNotFoundException e) {
            System.err.println(toString() + ": Unable to obtain configuration: "+e);
            return false;
        }
        // dependency check suceeded
        return true;
    }
    
    /**
     * Overrides the {@link java.lang.Object#toString() Object.toString()}
     * method to provide clean logging (every class should have this).
     *
     * This uses the uk.ac.ukc.iscream.util.NameFormat class
     * to format the toString()
     *
     * @return the name of this class and its CVS revision
     */
    public String toString() {
        return FormatName.getName(
            NAME,
            getClass().getName(),
            REVISION);
    }

//---PRIVATE METHODS---

//---ACCESSOR/MUTATOR METHODS---

//---ATTRIBUTES---

    /**
     * This holds a reference to the
     * system logger that is being used.
     */
    private Logger _logger;

    /**
     * A reference to the reference manager in use
     */
    private ReferenceManager _refman = ReferenceManager.getInstance();

//---STATIC ATTRIBUTES---

    /**
     * The friendly name for this component, used by
     * all related classes.
     * This is set from the configuration.
     */
    public static String NAME;

}            
Revision:	1.31
Committed:	Wed Mar 14 01:54:35 2001 UTC (23 years, 2 months ago) by tdb
Branch:	MAIN
Changes since 1.30:	+4 -4 lines
Log Message:	Of course, being my usual sensible self, I potentially had a situation where by I would log to the Logger than the Logger isn't running. Clever eh ? :)
#	User	Rev	Content
1	ajm	1.27
2	tdb	1.1	//---PACKAGE DECLARATION---
3	tdb	1.3	package uk.ac.ukc.iscream.rootfilter;
4	tdb	1.1
5			//---IMPORTS---
6	ajm	1.5	import uk.ac.ukc.iscream.util.*;
7	tdb	1.1	import uk.ac.ukc.iscream.core.*;
8	tdb	1.16	import uk.ac.ukc.iscream.componentmanager.*;
9	ajm	1.8	import uk.ac.ukc.iscream.clientinterface.*;
10	tdb	1.1
11			/**
12	ajm	1.10	* The root filter is what all filters talk to
13			* Hosts cannot talk to this implementation of a filter.
14			* It provides hooks to all data interfaces for the system
15			* namely the client interface and the db interface.
16			* This is an i-scream component that starts the
17			* RootFilter services.
18	tdb	1.1	*
19	tdb	1.29	* @author $Author: tdb1 $
20	tdb	1.31	* @version $Id: RootFilter.java,v 1.30 2001/03/14 01:43:58 tdb1 Exp $
21	tdb	1.1	*/
22	tdb	1.17	public class RootFilter implements Component {
23	tdb	1.1
24			//---FINAL ATTRIBUTES---
25
26			/**
27			* The current CVS revision of this class
28			*/
29	tdb	1.31	public static final String REVISION = "$Revision: 1.30 $";
30	ajm	1.10
31	tdb	1.1	//---STATIC METHODS---
32
33	ajm	1.10	//---CONSTRUCTORS---
34
35			//---PUBLIC METHODS---
36	ajm	1.5
37	ajm	1.10	/**
38			* This starts the Root Filter for the system
39			*/
40			public void start() throws ComponentStartException {
41	ajm	1.26	// get references to key objects
42	tdb	1.30	_logger = _refman.getLogger();
43	ajm	1.26
44	ajm	1.10	_logger.write(toString(), Logger.SYSINIT, "coming up");
45	tdb	1.28
46			ConfigurationProxy cp = ConfigurationProxy.getInstance();
47			String configName = "RootFilter";
48
49			// set the name of the root filter
50			try {
51			NAME = cp.getProperty(configName, "RootFilter.name");
52			} catch (PropertyNotFoundException e) {
53			NAME = null;
54			_logger.write(toString(), Logger.WARNING, "RootFilter name not set: "+e);
55	tdb	1.23	}
56	tdb	1.28
57			// try and get the names of the ciReal and ciDB
58			String realInterface, dbInterface;
59			try {
60			realInterface = cp.getProperty(configName, "RootFilter.realtimeInterfaceName");
61			dbInterface = cp.getProperty(configName, "RootFilter.dbInterfaceName");
62			} catch (PropertyNotFoundException e) {
63			_logger.write(toString(), Logger.DEBUG, "Optional config not set: "+e);
64			realInterface = null;
65			dbInterface = null;
66	tdb	1.1	}
67	tdb	1.23
68	ajm	1.13	ClientInterface ciReal = null, ciDB = null;
69	ajm	1.8	// get reference to the client interfaces - the real time one
70	ajm	1.11	if (realInterface != null) {
71	ajm	1.13	ciReal = ClientInterfaceHelper.narrow(_refman.getCORBARef("iscream.ClientInterface." + realInterface));
72	ajm	1.11	}
73	ajm	1.10	// get reference to the client interfaces - and the db one
74	ajm	1.11	if (dbInterface != null) {
75	ajm	1.13	ciDB = ClientInterfaceHelper.narrow(_refman.getCORBARef("iscream.ClientInterface." + dbInterface));
76	ajm	1.11	}
77	tdb	1.28
78			// setup a queue
79			Queue queue = new Queue();
80	tdb	1.15
81	tdb	1.28	// startup a monitor on this queue
82			try {
83			// try to get the interval, if this fails, we won't start up the monitor
84			int queueMonitorInterval = Integer.parseInt(cp.getProperty(configName, "Queue.MonitorInterval"));
85			String queueName = NAME + " RootFilter";
86			queue.startMonitor(queueMonitorInterval*1000, queueName);
87			} catch (PropertyNotFoundException e) {
88			_logger.write(toString(), Logger.WARNING, "failed to find queue monitor config, disabling. " + e);
89			}
90	tdb	1.15
91	ajm	1.11	if (realInterface == null) {
92			_logger.write(toString(), Logger.DEBUG, "hooked to interfaces - " + dbInterface);
93	tdb	1.15	CIWrapper c = new CIWrapper(ciDB, queue);
94			c.start();
95	ajm	1.11	} else if (dbInterface == null) {
96			_logger.write(toString(), Logger.DEBUG, "hooked to interfaces - " + realInterface);
97	tdb	1.15	CIWrapper c = new CIWrapper(ciReal, queue);
98			c.start();
99	ajm	1.11	} else {
100			_logger.write(toString(), Logger.DEBUG, "hooked to interfaces - " + realInterface + " & " + dbInterface);
101	tdb	1.15	CIWrapper c = new CIWrapper(ciReal, queue);
102			c.start();
103			c = new CIWrapper(ciDB, queue);
104			c.start();
105	ajm	1.11	}
106	tdb	1.15
107	ajm	1.8	// RootFilterServant start (for inbound child filter data)
108	ajm	1.10	_logger.write(toString(), Logger.DEBUG, "starting Root Filter");
109	tdb	1.15	RootFilterServant filterServant = new RootFilterServant(queue);
110	ajm	1.8	// bind to the naming service as a filter
111	ajm	1.14	_refman.bindToOrb(filterServant, "iscream.Filter." + RootFilter.NAME);
112	tdb	1.1
113	ajm	1.10	_logger.write(toString(), Logger.SYSINIT, "started");
114	tdb	1.18
115	tdb	1.29	}
116
117			/**
118			* Does a dependency check. Used mainly at startup to
119			* see if the required dependencies (components) are up
120			* and running.
121			*
122			* @return a boolean value, true if the depdencies are satisfied
123			*/
124			public boolean depCheck() {
125			try {
126			org.omg.CORBA.Object obj;
127			// first check the ConfigurationManager is alive
128			obj = _refman.getCORBARef("iscream.ConfigurationManager");
129			// then get some info on the CLI and DBI
130			ConfigurationProxy cp = ConfigurationProxy.getInstance();
131			String cli = cp.getProperty("RootFilter", "RootFilter.realtimeInterfaceName");
132			String dbi = cp.getProperty("RootFilter", "RootFilter.dbInterfaceName");
133			// finally check the CLI and DBI are alive
134			obj = _refman.getCORBARef("iscream.ClientInterface." + cli);
135			obj = _refman.getCORBARef("iscream.ClientInterface." + dbi);
136			} catch(ComponentCORBAException e) {
137	tdb	1.31	System.err.println(toString() + ": Dependency Failure: "+e);
138	tdb	1.29	return false;
139			} catch(PropertyNotFoundException e) {
140	tdb	1.31	System.err.println(toString() + ": Unable to obtain configuration: "+e);
141	tdb	1.29	return false;
142			}
143			// dependency check suceeded
144			return true;
145	tdb	1.1	}
146	ajm	1.10
147			/**
148			* Overrides the {@link java.lang.Object#toString() Object.toString()}
149			* method to provide clean logging (every class should have this).
150			*
151			* This uses the uk.ac.ukc.iscream.util.NameFormat class
152			* to format the toString()
153			*
154			* @return the name of this class and its CVS revision
155			*/
156			public String toString() {
157			return FormatName.getName(
158	ajm	1.14	NAME,
159	ajm	1.10	getClass().getName(),
160			REVISION);
161	tdb	1.1	}
162
163			//---PRIVATE METHODS---
164
165			//---ACCESSOR/MUTATOR METHODS---
166
167			//---ATTRIBUTES---
168	ajm	1.10
169			/**
170			* This holds a reference to the
171			* system logger that is being used.
172			*/
173	ajm	1.26	private Logger _logger;
174	ajm	1.10
175			/**
176			* A reference to the reference manager in use
177			*/
178	tdb	1.30	private ReferenceManager _refman = ReferenceManager.getInstance();
179	ajm	1.10
180	tdb	1.1	//---STATIC ATTRIBUTES---
181	ajm	1.10
182			/**
183			* The friendly name for this component, used by
184			* all related classes.
185			* This is set from the configuration.
186			*/
187			public static String NAME;
188	tdb	1.1
189	ajm	1.5	}