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package org.glassfish.jersey.server.internal.monitoring.jmx;
import java.util.HashMap;
import java.util.Map;
import javax.management.Attribute;
import javax.management.AttributeList;
import javax.management.AttributeNotFoundException;
import javax.management.DynamicMBean;
import javax.management.InvalidAttributeValueException;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanException;
import javax.management.MBeanInfo;
import javax.management.ReflectionException;
import org.glassfish.jersey.internal.util.collection.Value;
import org.glassfish.jersey.server.monitoring.ExecutionStatistics;
import org.glassfish.jersey.server.monitoring.TimeWindowStatistics;
/**
* Dynamic MBean that exposes information about execution statistics. The exposed information contains
* execution statistics for various time window sizes.
*
* @author Miroslav Fuksa
*/
public class ExecutionStatisticsDynamicBean implements DynamicMBean {
private volatile ExecutionStatistics executionStatistics;
private final Map<String, Value<Object>> attributeValues = new HashMap<>();
private final MBeanInfo mBeanInfo;
private MBeanInfo initMBeanInfo(final ExecutionStatistics initialStatistics) {
final Map<Long, TimeWindowStatistics> statsMap = initialStatistics.getTimeWindowStatistics();
MBeanAttributeInfo[] attrs = new MBeanAttributeInfo[statsMap.size() * 5];
int i = 0;
for (final TimeWindowStatistics stats : statsMap.values()) {
final long interval = stats.getTimeWindow();
final String postfix = convertIntervalToString((int) interval);
String name = "MinTime[ms]_" + postfix;
attrs[i++] = new MBeanAttributeInfo(name, "long", "Minimum request processing time in milliseconds in last "
+ postfix + ".", true, false, false);
attributeValues.put(name, new Value<Object>() {
@Override
public Object get() {
return executionStatistics.getTimeWindowStatistics().get(interval).getMinimumDuration();
}
});
name = "MaxTime[ms]_" + postfix;
attrs[i++] = new MBeanAttributeInfo(name, "long", "Minimum request processing time in milliseconds in last "
+ postfix + ".", true, false, false);
attributeValues.put(name, new Value<Object>() {
@Override
public Object get() {
return executionStatistics.getTimeWindowStatistics().get(interval).getMaximumDuration();
}
});
name = "AverageTime[ms]_" + postfix;
attrs[i++] = new MBeanAttributeInfo(name, "long", "Average request processing time in milliseconds in last "
+ postfix + ".", true, false, false);
attributeValues.put(name, new Value<Object>() {
@Override
public Object get() {
return executionStatistics.getTimeWindowStatistics().get(interval).getAverageDuration();
}
});
name = "RequestRate[requestsPerSeconds]_" + postfix;
attrs[i++] = new MBeanAttributeInfo(name, "double", "Average requests per second in last "
+ postfix + ".", true, false, false);
attributeValues.put(name, new Value<Object>() {
@Override
public Object get() {
return executionStatistics.getTimeWindowStatistics().get(interval).getRequestsPerSecond();
}
});
name = "RequestCount_" + postfix;
attrs[i++] = new MBeanAttributeInfo(name, "double", "Request count in last "
+ postfix + ".", true, false, false);
attributeValues.put(name, new Value<Object>() {
@Override
public Object get() {
return executionStatistics.getTimeWindowStatistics().get(interval).getRequestCount();
}
});
}
return new MBeanInfo(this.getClass().getName(), "Execution statistics", attrs, null, null, null);
}
private String convertIntervalToString(int interval) {
int hours = (int) interval / 3600000;
interval = interval - hours * 3600000;
int minutes = (int) interval / 60000;
interval = interval - minutes * 60000;
int seconds = (int) interval / 1000;
StringBuffer sb = new StringBuffer();
if (hours > 0) {
sb.append(hours).append("h_");
}
if (minutes > 0) {
sb.append(minutes).append("m_");
}
if (seconds > 0) {
sb.append(seconds).append("s_");
}
if (sb.length() == 0) {
sb.append("total");
} else {
sb.setLength(sb.length() - 1);
}
return sb.toString();
}
/**
* Create a new MXBean and register it into the mbean server using {@code mBeanExposer}.
* @param executionStatistics Execution statistics to be exposed.
* @param mBeanExposer mbean exposer.
* @param parentBeanName Name of the parent mxbean.
* @param beanName A required name of this exposed bean.
*/
public ExecutionStatisticsDynamicBean(ExecutionStatistics executionStatistics, MBeanExposer mBeanExposer,
String parentBeanName, String beanName) {
this.executionStatistics = executionStatistics;
this.mBeanInfo = initMBeanInfo(executionStatistics);
mBeanExposer.registerMBean(this, parentBeanName + ",executionTimes=" + beanName);
}
/**
* Update the execution statistics that are exposed by this MBean.
* @param executionStatistics New execution statistics.
*/
public void updateExecutionStatistics(ExecutionStatistics executionStatistics) {
this.executionStatistics = executionStatistics;
}
@Override
public Object getAttribute(String attribute) throws AttributeNotFoundException, MBeanException, ReflectionException {
return attributeValues.get(attribute).get();
}
@Override
public void setAttribute(Attribute attribute)
throws AttributeNotFoundException, InvalidAttributeValueException, MBeanException, ReflectionException {
}
@Override
public AttributeList getAttributes(String[] attributes) {
// TODO: implement
return null;
}
@Override
public AttributeList setAttributes(AttributeList attributes) {
return null;
}
@Override
public Object invoke(String actionName, Object[] params, String[] signature) throws MBeanException, ReflectionException {
return null;
}
@Override
public MBeanInfo getMBeanInfo() {
return mBeanInfo;
}
}