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//---PACKAGE DECLARATION--- |
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package uk.ac.ukc.iscream.filter; |
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|
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//---IMPORTS--- |
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import uk.ac.ukc.iscream.core.*; |
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import uk.ac.ukc.iscream.filter.*; |
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import uk.ac.ukc.iscream.componentmanager.*; |
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import java.net.Socket; |
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import java.io.InputStream; |
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import java.io.OutputStream; |
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import java.io.IOException; |
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import java.io.*; |
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import uk.ac.ukc.iscream.util.*; |
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|
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/** |
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* This provides Host heartbeat functionality |
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* |
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* @author $Author: tdb1 $ |
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* @version $Id: TCPReaderInit.java,v 1.22 2001/03/13 16:25:57 tdb1 Exp $ |
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*/ |
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class TCPReaderInit extends Thread { |
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|
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//---FINAL ATTRIBUTES--- |
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|
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/** |
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* The current CVS revision of this class |
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*/ |
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public final String REVISION = "$Revision: 1.22 $"; |
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|
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//---STATIC METHODS--- |
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|
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//---CONSTRUCTORS--- |
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|
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/** |
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* Construct a new TCPReaderInit. |
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* |
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* @param socket the Socket to which the host is connected |
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* @param queue the Queue to which we'll add data |
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* @throws IOException if something goes badly wrong |
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*/ |
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public TCPReaderInit(Socket socket, Queue queue) throws IOException { |
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// set the Thread name |
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setName("filter.TCPReaderInit"); |
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|
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_socket = socket; |
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_queue = queue; |
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// setup the reader & writer |
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_socketIn = new BufferedReader(new InputStreamReader(_socket.getInputStream())); |
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_socketOut = new PrintWriter(_socket.getOutputStream(), true); |
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_logger.write(toString(), Logger.SYSINIT, "created"); |
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} |
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|
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//---PUBLIC METHODS--- |
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|
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/** |
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* Main run method. Will communicate with the host, inform it |
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* if any updates to it's configuration are needed, and send |
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* a heartbeat packet into the system. |
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*/ |
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public void run() { |
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try { |
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//variables |
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String filelist = ""; |
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String lastModified = ""; |
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String inBound = ""; |
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|
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// try for HEARTBEAT |
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getInBound("HEARTBEAT"); |
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_socketOut.println("OK"); |
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|
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// try for CONFIG |
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getInBound("CONFIG"); |
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_socketOut.println("OK"); |
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|
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// try for {filelist} |
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filelist = getInBound(); |
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_socketOut.println("OK"); |
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|
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// try for {lastModified} |
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lastModified = getInBound(); |
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// check to see if a config update has happen |
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boolean newConfig = _configManager.isModified(filelist, Long.parseLong(lastModified)); |
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if(newConfig) { |
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// new config ! |
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_socketOut.println("ERROR"); |
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} |
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else { |
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// nothing has changed |
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_socketOut.println("OK"); |
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} |
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|
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// try for CONFIG |
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getInBound("ENDHEARTBEAT"); |
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_socketOut.println("OK"); |
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|
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// work out some information for our heartbeat packet |
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String date = new Long(System.currentTimeMillis()/((long) 1000)).toString(); //seconds |
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String hostname = _socket.getInetAddress().getHostName().toLowerCase(); |
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String ipadd = _socket.getInetAddress().getHostAddress(); |
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|
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// run the service checks for this host |
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_logger.write(toString(), Logger.DEBUG, "Running service checks"); |
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String checks = PluginServiceCheckManager.getInstance().runServiceChecks(hostname); |
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|
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// build the heartbeat packet |
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String xml = "<packet type=\"heartbeat\" machine_name=\""+hostname+"\" date=\""+date+"\" ip=\""+ipadd+"\">" + checks + "</packet>"; |
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|
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// get it to be sent on |
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_queue.add(xml); |
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|
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} catch (Exception e) { |
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_logger.write(toString(), Logger.ERROR, "ERROR: " + e); |
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} |
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|
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// Disconnect streams & socket |
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try { |
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_socketIn.close(); |
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_socketOut.close(); |
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_socket.close(); |
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} catch (IOException e) { |
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_logger.write(toString(), Logger.ERROR, "exception on socket close"); |
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} |
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_logger.write(toString(), Logger.DEBUG, "finished"); |
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} |
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|
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/** |
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* Overrides the {@link java.lang.Object#toString() Object.toString()} |
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* method to provide clean logging (every class should have this). |
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* |
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* This uses the uk.ac.ukc.iscream.util.NameFormat class |
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* to format the toString() |
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* |
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* @return the name of this class and its CVS revision |
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*/ |
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public String toString() { |
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return FormatName.getName( |
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_name, |
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getClass().getName(), |
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REVISION); |
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} |
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|
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//---PRIVATE METHODS--- |
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|
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private String getInBound(String expected) throws IOException { |
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// grab the input |
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String inBound = getInBound(); |
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// check if it's what we're expecting |
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if(!inBound.equals(expected)) { |
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throw new IOException("protocol error - expected:"+expected+" got:" + inBound); |
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} |
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// it should be ok then |
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return inBound; |
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} |
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|
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private String getInBound() throws IOException { |
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// grab the input |
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String inBound = _socketIn.readLine(); |
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// check for null's, likely disconnection |
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if(inBound == null) { |
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throw new IOException("got null from host, maybe it died"); |
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} |
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// it's a valid message it seems |
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return inBound; |
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} |
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|
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//---ACCESSOR/MUTATOR METHODS--- |
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|
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//---ATTRIBUTES--- |
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|
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/** |
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* A reference to the configuration manager |
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*/ |
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ConfigurationManager _configManager = ReferenceManager.getInstance().getCM(); |
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|
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/** |
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* This is the friendly identifier of the |
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* component this class is running in. |
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* eg, a Filter may be called "filter1", |
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* If this class does not have an owning |
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* component, a name from the configuration |
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* can be placed here. This name could also |
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* be changed to null for utility classes. |
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*/ |
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private String _name = FilterMain.NAME; |
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|
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/** |
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* This holds a reference to the |
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* system logger that is being used. |
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*/ |
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private Logger _logger = ReferenceManager.getInstance().getLogger(); |
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|
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/** |
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* The socket we are talking on |
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*/ |
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Socket _socket; |
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|
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/** |
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* The input from the socket |
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*/ |
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BufferedReader _socketIn; |
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|
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/** |
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* The output from the socket |
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*/ |
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PrintWriter _socketOut; |
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|
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/** |
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* A reference to our Queue |
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*/ |
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Queue _queue; |
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//---STATIC ATTRIBUTES--- |
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|
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} |
