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package com.sun.enterprise.resource.monitor;
import com.sun.enterprise.admin.monitor.registry.MonitoringLevel;
import com.sun.enterprise.admin.monitor.registry.MonitoredObjectType;
import com.sun.enterprise.admin.monitor.registry.MonitoringLevelListener;
import com.sun.enterprise.admin.monitor.registry.MonitoringRegistry;
import com.sun.enterprise.config.serverbeans.JdbcConnectionPool;
import com.sun.enterprise.PoolManager;
import com.sun.enterprise.resource.MonitorableResourcePool;
import com.sun.enterprise.server.ApplicationServer;
import com.sun.enterprise.connectors.util.ResourcesUtil;
import com.sun.enterprise.server.ServerContext;
import com.sun.enterprise.Switch;
import java.util.concurrent.ConcurrentHashMap;
import javax.management.j2ee.statistics.Stats;
import com.sun.logging.LogDomains;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.security.AccessController;
import java.security.PrivilegedAction;
import com.sun.enterprise.resource.ResourcePool;
/**
* Provides an implementation of the MonitoringLevelListener interface to
* receive callbacks from admin regarding change in the monitoring level.
* Though there are 3 monitoring levels defined by JSR77, we support
* only 2 levels - OFF and ON (HIGH/LOW). So essentially, HIGH and LOW
* for us is only ON
*
* @author Aditya Gore
* @since s1aspe 8.0
*/
public class JDBCPoolMonitoringLevelListener implements MonitoringLevelListener {
private MonitoringRegistry registry_;
private static final MonitoringLevel OFF = MonitoringLevel.OFF;
private static final MonitoringLevel HIGH = MonitoringLevel.HIGH;
private static final MonitoringLevel LOW = MonitoringLevel.LOW;
private static Logger _logger = LogDomains.getLogger(
LogDomains.RSR_LOGGER );
public JDBCPoolMonitoringLevelListener() {
}
/**
* This is the callback for change in monitoring levels.
* This shall go off once the admin team removes this method
*/
public void setLevel( MonitoringLevel level ) {}
/**
* This is the callback method called when the monitoring level
* changes from HIGH/LOW <-> OFF
* <p>Here since the MonitoringLevel is a "type-safe enum", we
* can directly check equality using ==
* @param from - the old level
* @param to - the new level
* @param handback - the stats implementation object which was
* registered with the MonitoringRegistry
*/
public void changeLevel( MonitoringLevel from, MonitoringLevel to,
Stats handback ) {
}
public void changeLevel(MonitoringLevel from, MonitoringLevel to,
MonitoredObjectType type) {
//If we were called, the type has to be JDBC_CONN_POOL so
//we can safely ignore the type
if ( from == to ) {
//Its a no-op, so return
return;
}
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
ServerContext ctxt = ApplicationServer.getServerContext();
if (ctxt != null) {
registry_ = ctxt.getMonitoringRegistry();
}
return null;
}
});
if (from == OFF || from == LOW) {
if (to == HIGH) {
logFine("Changing level from " + from +" to HIGH");
transitionToHigh();
}
}
if (from == HIGH || from == LOW ) {
if ( to == OFF ) {
logFine("Switching level from " + from + " to OFF");
switchOffMonitoring();
}
}
if (from == OFF || from == HIGH ) {
if ( to == LOW ) {
logFine("Changing level from " + from + " to LOW");
transitionToLow();
}
}
}
/*
* Query the resources util and get a list of jdbc pools
*/
private MonitorableResourcePool[] getPoolList() {
ResourcesUtil resUtil = ResourcesUtil.createInstance();
JdbcConnectionPool[] jp = resUtil.getJdbcConnectionPools();
if (jp == null) {
return null;
}
MonitorableResourcePool[] pools = new MonitorableResourcePool[ jp.length ];
ConcurrentHashMap poolTable = getPoolManager().getPoolTable();
for( int i = 0 ; i < jp.length; i++ ) {
ResourcePool p = (ResourcePool) poolTable.get( jp[i].getName() );
if (p != null && (p instanceof MonitorableResourcePool ) ) {
pools[i] = (MonitorableResourcePool)p;
}
}
return pools;
}
private PoolManager getPoolManager() {
return Switch.getSwitch().getPoolManager();
}
private void transitionToSpecifiedLevel(final MonitoringLevel monitoringLevel){
AccessController.doPrivileged( new PrivilegedAction() {
public Object run() {
//we should create a new pool object everytime since
//the stats have to be collected afresh
MonitorableResourcePool[] pools = getPoolList();
if (pools == null) {
return null;
}
for (MonitorableResourcePool pool : pools) {
if (pool != null) {
try {
JDBCConnectionPoolStatsImpl stats = new
JDBCConnectionPoolStatsImpl(pool);
if(monitoringLevel == MonitoringLevel.HIGH )
getPoolManager().setMonitoringEnabledHigh(pool.getPoolName());
else if(monitoringLevel == MonitoringLevel.LOW )
getPoolManager().setMonitoringEnabledLow(pool.getPoolName());
registry_.registerJDBCConnectionPoolStats(
stats, pool.getPoolName(), null);
} catch (Exception mre) {
try {
_logger.log(Level.INFO, "poolmon.cannot_reg: " +
pool.getPoolName(), mre.getMessage());
getPoolManager().disableMonitoring(
pool.getPoolName());
} catch (Exception ex) {
//FIXME: ignore?
}
}
}
}
return null;
}
});
}
private void transitionToHigh() {
transitionToSpecifiedLevel(MonitoringLevel.HIGH);
}
private void switchOffMonitoring() {
//deregister
AccessController.doPrivileged( new PrivilegedAction() {
public Object run() {
MonitorableResourcePool[] pools = getPoolList();
if (pools == null) {
return null;
}
for (MonitorableResourcePool pool : pools) {
if (pool != null) {
try {
registry_.unregisterJDBCConnectionPoolStats(
pool.getPoolName());
getPoolManager().disableMonitoring(
pool.getPoolName());
} catch (Exception mre) {
_logger.log(Level.WARNING, "poolmon.cannot_unreg: "
+ pool.getPoolName(), mre.getMessage());
}
}
}
return null;
}
});
}
private void transitionToLow() {
transitionToSpecifiedLevel(MonitoringLevel.LOW);
}
private void logFine( String msg ) {
if (_logger.isLoggable( Level.FINE ) && msg != null ) {
_logger.fine( msg );
}
}
}
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