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package com.sun.enterprise.admin.jmx.remote.notification;
import java.io.IOException;
import java.io.EOFException;
import java.io.InputStream;
import java.io.BufferedInputStream;
import java.io.ObjectInputStream;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.nio.channels.ClosedChannelException;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.rmi.ConnectException;
import java.rmi.ConnectIOException;
import java.net.URLConnection;
import java.net.HttpURLConnection;
import java.util.logging.Logger;
import com.sun.enterprise.admin.jmx.remote.notification.NotificationWrapper;
import com.sun.enterprise.admin.jmx.remote.comm.HttpConnectorAddress;
import com.sun.enterprise.admin.jmx.remote.DefaultConfiguration;
/**
* This is the notification receiver thread.
* This thread makes the connection to the server-side and starts to receive
* the notifications.
* During a JMXConnector.close call, this thread would send a close message to the
* server-side and would exit.
*/
class NotificationReceiver implements Runnable {
private ClientNotificationManager mgr = null;
private String notifMgrUri = null;
private HttpConnectorAddress ad = null;
private URLConnection mConnection = null;
private ObjectInputStream objIn = null;
private InputStream in = null;
private boolean exit = false;
private boolean connected = false;
private boolean timedout = false;
private int nReconnected= 0;
private Thread receiveThr = null;
private static final Logger logger = Logger.getLogger(
DefaultConfiguration.JMXCONNECTOR_LOGGER);/*,
DefaultConfiguration.LOGGER_RESOURCE_BUNDLE_NAME );*/
public NotificationReceiver(HttpConnectorAddress ad, ClientNotificationManager mgr)
throws IOException {
this.mgr = mgr;
this.ad = ad;
this.notifMgrUri = getNotifMgrURI();
connect();
receiveThr = new Thread(this);
receiveThr.start();
}
private String getNotifMgrURI() {
String uri = ad.getPath();
if (uri == null || uri.trim().length() == 0)
uri = DefaultConfiguration.DEFAULT_SERVLET_CONTEXT_ROOT;
uri = uri +
DefaultConfiguration.NOTIF_MGR_PATHINFO +
"?" + DefaultConfiguration.NOTIF_ID_PARAM +
"=" + mgr.getId();
return uri;
}
private void connect() throws IOException {
if (connected)
return;
connect(null, false);
}
private void connect(String cmd, boolean disconnect) throws IOException {
try{
String uri = notifMgrUri;
if (cmd != null)
uri = uri + "&" +
DefaultConfiguration.NOTIF_CMD_PARAM +
"=" + DefaultConfiguration.NOTIF_CMD_CLOSE;
System.setProperty("sun.net.client.defaultConnectTimeout",
Integer.toString(DefaultConfiguration.NOTIF_CONNECT_TIMEOUT)); // XXX: For Sun JDK only
URLConnection conn = ad.openConnection(uri);
// conn.setConnectTimeout(2000); // XXX: For jdk 1.5
InputStream inStream = conn.getInputStream();
if (!disconnect) {
mConnection = conn;
in = inStream;
connected = true;
nReconnected = 0;
} else {
disconnect(conn, inStream);
}
} catch (IOException ioe){
ioe.printStackTrace();
throw (ioe);
}
}
/**
* Reinitialized the connection, if the connection is dropped.
* This method is invoked from ClientNotificationManager every time the client
* invokes a method on MBeanServerConnection.
*/
public boolean reinit() throws IOException {
if (connected)
return true;
timedout = false;
try {
connect();
} catch (IOException ioe) {
timedout = true;
throw ioe;
}
nReconnected = 0;
receiveThr = new Thread(this);
receiveThr.start();
return true;
}
/**
* Returns if the receiver has timedout while trying to receive
* notitifications from the server.
* Timedout -- If a socket timeout happens while trying to connect
* If the server is not reachable 3 times consequtively during thread loop.
* If not able to connect when reinit is called.
*/
public boolean hasTimedout() {
return timedout;
}
/**
* The notification receiver thread loop.
* This loop, if client has not called JMXConnector.close, will
* try to read a notification message from the connection and notify
* the ClientNotificationManager to dispatch the notification.
*/
public void run() {
while (!isExiting()) {
try {
connect();
readNotification();
} catch (IOException ioe) {
if (isExiting())
break;
ioe.printStackTrace();
if (ioe instanceof SocketTimeoutException) {
timedout = true;
break;
}
if (isDisconnected(ioe)) {
connected = false;
nReconnected++;
if (nReconnected > 3) {
timedout = true;
break;
}
continue;
} else if (isExiting()) {
break;
}
}
}
}
private boolean isDisconnected(IOException ioe) {
if (ioe instanceof ClosedChannelException ||
ioe instanceof SocketException ||
ioe instanceof ConnectException ||
ioe instanceof ConnectIOException ||
ioe instanceof EOFException)
return true;
return false;
}
private void disconnect() throws IOException {
disconnect(mConnection, in);
}
private void disconnect(URLConnection conn, InputStream in) throws IOException {
if (conn instanceof HttpURLConnection) {
((HttpURLConnection)conn).disconnect();
} else
in.close();
}
public void exit() throws Exception {
exit = true;
sendCloseMessage();
disconnect();
receiveThr.join();
}
private void sendCloseMessage() throws IOException {
connect("close", true);
}
private boolean isExiting() {
return exit;
}
private void readNotification() throws IOException {
Object obj = null;
try {
objIn = new ObjectInputStream(in);
obj = objIn.readObject();
} catch (IOException ioe) {
String msg = ioe.getMessage();
if (msg != null && msg.indexOf("EOF") != -1)
throw (new EOFException(msg));
throw ioe;
} catch (ClassNotFoundException notfound) {
// Ignore; Unknown Object ???
return;
}
NotificationWrapper wrapr = (NotificationWrapper) obj;
if (wrapr.getType() == NotificationWrapper.WAIT) {
return;
}
mgr.raiseEvent(wrapr);
}
}
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