/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.geronimo.monitoring.ejb.snapshot;
import java.io.File;
import java.lang.reflect.UndeclaredThrowableException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Set;
import javax.management.ObjectName;
import org.apache.geronimo.kernel.NoSuchOperationException;
import org.apache.geronimo.monitoring.MBeanHelper;
import org.apache.geronimo.monitoring.ejb.MasterRemoteControl;
import org.apache.geronimo.monitoring.snapshot.SnapshotConfigXMLBuilder;
import org.apache.geronimo.monitoring.snapshot.SnapshotDBHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Thread that is in charge of executing every x milliseconds. Upon each
* iteration, a snapshot of the server's information is recorded.
*/
public class SnapshotProcessor {
private static final Logger log = LoggerFactory.getLogger(SnapshotProcessor.class);
/**
* Collects JSR-77 statistics for all mbeans that have been chosen to
* be monitored and stores it in a DB. Will also, archive snapshots
* if they have passed their retention period.
* @param mrc
*/
public static void takeSnapshot(MasterRemoteControl mrc) {
// ensure that there is a 'monitoring' directory
ensureMonitorDir();
// get any saved mbean names from snapshot-config.xml
ArrayList<String> mbeanNames = SnapshotConfigXMLBuilder.getMBeanNames();
// in the case where nothing is present, grab a set of default mbeans
if(mbeanNames.size() <= 0) {
mbeanNames = getDefaultMBeanList(mrc);
}
// turn on all stats in the list
setStatsOn(mbeanNames, mrc);
try {
// take a snapshot
log.info("======SNAPSHOT======");
// instantiate map <mbean name, stats for mbean>
HashMap<String, HashMap<String, Long>> aggregateStats = new HashMap<String, HashMap<String, Long>>();
// for each mbean name in the list, get its stats
for (String mbeanName : mbeanNames) {
HashMap<String, Long> stats = mrc.getStats(mbeanName);
aggregateStats.put(mbeanName, stats);
}
// store the data in a DB
(new SnapshotDBHelper()).addSnapshotToDB(aggregateStats);
for (String mbean : aggregateStats.keySet()) {
HashMap<String, Long> stats = aggregateStats.get(mbean);
log.info(mbean);
for (String key : stats.keySet()) {
Long value = stats.get(key);
log.info(key + ": " + value);
}
}
} catch(Exception e) {
log.error(e.getMessage(), e);
}
}
/**
* Turns all statistics on for each mbean in the list.
*
* @param mbeanList
*/
private static void setStatsOn(ArrayList<String> mbeanList, MasterRemoteControl mrc) {
// for each mbean name in the list
for (String aMbeanList : mbeanList) {
// turn the statistics collection on
String methodName = "setStatsOn";
Object[] params = new Object[]{Boolean.TRUE};
String[] signatures = new String[]{"boolean"};
try {
ObjectName objName = new ObjectName(aMbeanList);
mrc.invoke(objName, methodName, params, signatures);
log.info("Stats for " + aMbeanList + " was turned on.");
} catch (UndeclaredThrowableException e) {
// HACK : this will happen for components that always collect statistics
// and do not have StatsOn method.
} catch (javax.management.ReflectionException e) {
if (!(e.getCause() instanceof java.lang.NoSuchMethodException) || !(e.getCause().getCause() instanceof NoSuchOperationException)) {
log.error("unexpected jmx exception", e);
}
//othewise ignore -- presumably something changed in exception handling.
} catch (Exception e) {
log.error(e.getMessage(), e);
}
}
}
/**
* @return A list of all default mbeans; namely, all connector or container mbean names
* Prereq: in order to be a connector or container mbean the name must contain "Connector"/"Container"
* and "Tomcat"/"Jetty" or JVM.
*/
private static ArrayList<String> getDefaultMBeanList(MasterRemoteControl mrc) {
Set<String> mbeans = MBeanHelper.getStatsProvidersMBeans( mrc.getAllMBeanNames() );
ArrayList<String> retval = new ArrayList<String>();
for (Object mbean : mbeans) {
String name = (String) mbean;
if (((name.contains("Connector") || name.contains("Container")) && (name.contains("Jetty") || name.contains("Tomcat")))
|| name.contains("JVM")) {
// this is a connector or JVM, so add to the list
retval.add(name);
// update the snapshot-config.xml to include these
SnapshotConfigXMLBuilder.addMBeanName(name);
}
}
return retval;
}
/**
* Checks to see if the GERONIMO_SERVER/var/monitoring/ directory was made.
* If not, the method creates it.
*/
public static void ensureMonitorDir() {
final String pathToDir =
System.getProperty("org.apache.geronimo.server.dir") + "/var/monitoring/";
File dir = new File(pathToDir);
if(dir.exists() && dir.isDirectory()) {
// all good
return;
} else {
// make a directory
if(dir.mkdir()) {
// directory was successfully created
log.info("/var/monitoring directory created.");
return;
} else {
log.error("Could not make the directory " + pathToDir);
}
}
}
}