server/filter/ServiceCheckSkeleton.java

//---PACKAGE DECLARATION---
package uk.org.iscream.filter;

//---IMPORTS---
import java.net.*;
import java.io.*;

/**
 * A skeleton class for Service Checks to extend.
 *
 * @author  $Author: tdb1 $
 * @version $Id: ServiceCheckSkeleton.java,v 1.3 2001/03/08 00:34:11 tdb1 Exp $
 */
public abstract class ServiceCheckSkeleton implements PluginServiceCheck {

//---FINAL ATTRIBUTES---
    
//---STATIC METHODS---

//---CONSTRUCTORS---

//---PUBLIC METHODS---
    
    /**
     * Runs a service check on a given hostname.
     *
     * @param hostname The hostname to check
     */
    public abstract String runServiceCheck(String hostname);
    
    /**
     * Checks if a service is returning a valid response, and
     * constructs suitable XML for inclusion in a packet.
     *
     * @param hostname The hostname to query
     * @param port The port to query
     * @param expectedSubString The String to look for in the response
     * @param XMLTag The name of the tag to be put in the XML
     * @return The String of XML with the response information
     */
    protected String checkService(String hostname, int port, String expectedSubString, String XMLTag) {
        String message, status;
        try {
            // connect and get response
            String response = connectToService(hostname, port);
            // check if the expected text is in the response
            if(response.indexOf(expectedSubString) != -1) {
                status = "0";
                message = "Good Header received: "+response;
            }
            else {
                status = "1";
                message = "Bad Header received: "+response;
            }
        } catch (IOException e) {
            // connect failed
            status = "1";
            message = "Service check failed to establish connection to host: " + e.getMessage();
        }
        return "<"+XMLTag+" status=\"" + status + "\" message=\"" + message + "\"></"+XMLTag+">";
    }
    
    /**
     * Connects to a service and returns the first line of text.
     *
     * @param hostname The hostname of the service to check
     * @param port The port of the service to check
     * @return The first line of text given
     * @throws IOException if the connection fails for some reason
     */
    protected String connectToService(String hostname, int port) throws IOException {
        // connect
        Socket socket = new Socket(hostname, port);
        BufferedReader socketIn = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        // read first line
        String response = socketIn.readLine();
        // close
        socketIn.close();
        socket.close();
        // return first line
        return response;
    }
    
    /**
     * Used to query the Service Check to see what it does.
     *
     * @return the String representation of what the Service Check does
     */
    public abstract String getDescription();

//---PRIVATE METHODS---

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

//---ATTRIBUTES---

//---STATIC ATTRIBUTES---

}
Revision:	1.4
Committed:	Wed Mar 14 23:25:29 2001 UTC (23 years, 2 months ago) by tdb
Branch:	MAIN
CVS Tags:	PROJECT_COMPLETION
Changes since 1.3:	+2 -2 lines
Log Message:	The whole server package structure has been changed. Old Package: uk.ac.ukc.iscream.* New Package: uk.org.iscream.*
#	User	Rev	Content
1	tdb	1.1	//---PACKAGE DECLARATION---
2	tdb	1.4	package uk.org.iscream.filter;
3	tdb	1.1
4			//---IMPORTS---
5			import java.net.*;
6			import java.io.*;
7
8			/**
9			* A skeleton class for Service Checks to extend.
10			*
11	tdb	1.2	* @author $Author: tdb1 $
12	tdb	1.4	* @version $Id: ServiceCheckSkeleton.java,v 1.3 2001/03/08 00:34:11 tdb1 Exp $
13	tdb	1.1	*/
14			public abstract class ServiceCheckSkeleton implements PluginServiceCheck {
15
16			//---FINAL ATTRIBUTES---
17
18			//---STATIC METHODS---
19
20			//---CONSTRUCTORS---
21
22			//---PUBLIC METHODS---
23
24			/**
25			* Runs a service check on a given hostname.
26			*
27			* @param hostname The hostname to check
28			*/
29			public abstract String runServiceCheck(String hostname);
30
31			/**
32			* Checks if a service is returning a valid response, and
33			* constructs suitable XML for inclusion in a packet.
34			*
35			* @param hostname The hostname to query
36			* @param port The port to query
37			* @param expectedSubString The String to look for in the response
38			* @param XMLTag The name of the tag to be put in the XML
39			* @return The String of XML with the response information
40			*/
41			protected String checkService(String hostname, int port, String expectedSubString, String XMLTag) {
42			String message, status;
43			try {
44			// connect and get response
45			String response = connectToService(hostname, port);
46			// check if the expected text is in the response
47			if(response.indexOf(expectedSubString) != -1) {
48			status = "0";
49			message = "Good Header received: "+response;
50			}
51			else {
52			status = "1";
53			message = "Bad Header received: "+response;
54			}
55			} catch (IOException e) {
56			// connect failed
57			status = "1";
58			message = "Service check failed to establish connection to host: " + e.getMessage();
59			}
60			return "<"+XMLTag+" status=\"" + status + "\" message=\"" + message + "\"></"+XMLTag+">";
61			}
62
63			/**
64			* Connects to a service and returns the first line of text.
65			*
66			* @param hostname The hostname of the service to check
67			* @param port The port of the service to check
68			* @return The first line of text given
69			* @throws IOException if the connection fails for some reason
70			*/
71			protected String connectToService(String hostname, int port) throws IOException {
72			// connect
73	tdb	1.2	Socket socket = new Socket(hostname, port);
74	tdb	1.1	BufferedReader socketIn = new BufferedReader(new InputStreamReader(socket.getInputStream()));
75			// read first line
76			String response = socketIn.readLine();
77			// close
78			socketIn.close();
79			socket.close();
80			// return first line
81			return response;
82			}
83
84			/**
85			* Used to query the Service Check to see what it does.
86			*
87			* @return the String representation of what the Service Check does
88			*/
89	tdb	1.3	public abstract String getDescription();
90	tdb	1.1
91			//---PRIVATE METHODS---
92
93			//---ACCESSOR/MUTATOR METHODS---
94
95			//---ATTRIBUTES---
96
97			//---STATIC ATTRIBUTES---
98
99			}