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/*
* ThreadMonitor.java
*
* Created on July 21, 2005, 11:50 AM
*/
package com.sun.enterprise.admin.mbeans.jvm;
import com.sun.enterprise.admin.common.constant.AdminConstants;
import com.sun.enterprise.util.i18n.StringManager;
import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.util.logging.Logger;
import javax.management.MBeanServerConnection;
/**
*/
class ThreadMonitor {
private final MBeanServerConnection mbsc;
private static final Logger logger = Logger.getLogger(AdminConstants.kLoggerName);
private final StringManager sm = StringManager.getManager(ThreadMonitor.class);
public ThreadMonitor(final MBeanServerConnection mbsc) {
this.mbsc = mbsc;
}
public final String getThreadDump() {
final long start = System.currentTimeMillis();
final StringBuilder sb = new StringBuilder();
final StringBuilderNewLineAppender td = new StringBuilderNewLineAppender(sb);
try {
final ThreadMXBean tmx = ManagementFactory.newPlatformMXBeanProxy(mbsc, ManagementFactory.THREAD_MXBEAN_NAME, ThreadMXBean.class);
final String title = getTitle();
td.append(title);
final long[] tids = tmx.getAllThreadIds();
td.append(sm.getString("thread.no", tmx.getThreadCount()));
td.append(sm.getString("daemon.threads.no", tmx.getDaemonThreadCount()));
final ThreadInfo[] tinfos = tmx.getThreadInfo(tids, Integer.MAX_VALUE);
/*
Arrays.sort(tinfos, new Comparator<ThreadInfo> () {
public int compare(ThreadInfo a, ThreadInfo b) {
return ( a.getThreadName().compareTo(b.getThreadName()) );
}
});
*/
for (final ThreadInfo ti : tinfos) {
td.append(dumpThread(ti));
}
sb.append(getDeadlockInfo(tmx));
return ( td.toString() );
} catch(final Exception e) {
throw new RuntimeException(e);
}
finally {
final long end = System.currentTimeMillis();
final double time = (end/1000.0) - (start/1000.0);
logger.info("Time in seconds to get the jvm thread dump: " + time);
}
}
private String dumpThread(final ThreadInfo ti) {
final long ids = ti.getThreadId();
final String ss = ti.getThreadState().toString();
//following should work because of autoboxing :)
String msg = sm.getString("thread.title", quote(ti.getThreadName()), ids, ss);
final StringBuilder sb = new StringBuilder(msg);
if (ti.getLockName() != null) {
msg = sm.getString("thread.waiting.on", ti.getLockName());
sb.append(msg);
}
if (ti.isSuspended()) {
msg = sm.getString("thread.suspended");
sb.append(msg);
}
if (ti.isInNative()) {
msg = sm.getString("thread.in.native");
sb.append(msg);
}
sb.append(System.getProperty("line.separator"));
if (ti.getLockOwnerName() != null) {
msg = sm.getString("thread.owner", ti.getLockOwnerName(), ti.getLockOwnerId());
sb.append(msg);
}
for (final StackTraceElement ste : ti.getStackTrace()) {
msg = sm.getString("thread.stack.element", ste.toString());
sb.append(msg);
sb.append(System.getProperty("line.separator"));
}
sb.append(System.getProperty("line.separator"));
return ( sb.toString() );
}
private String getTitle() throws Exception {
final RuntimeMXBean rt = ManagementFactory.newPlatformMXBeanProxy(mbsc, ManagementFactory.RUNTIME_MXBEAN_NAME, RuntimeMXBean.class);
final String vmname = rt.getVmName();
final String vmversion = rt.getVmVersion();
final String vmvendor = rt.getVmVendor();
final String title = sm.getString("td.title", vmname, vmversion, vmvendor);
return ( title );
}
private String quote(final String uq) {
final StringBuilder sb = new StringBuilder("\"");
sb.append(uq).append("\"");
return ( sb.toString() );
}
private String getDeadlockInfo(final ThreadMXBean tmx) {
final StringBuilderNewLineAppender sb = new StringBuilderNewLineAppender(new StringBuilder());
final long[] dts = tmx.findMonitorDeadlockedThreads();
if (dts == null) {
sb.append(sm.getString("no.deadlock"));
}
else {
sb.append(sm.getString("deadlocks.found"));
for (final long dt : dts) {
final ThreadInfo ti = tmx.getThreadInfo(dt);
sb.append(this.dumpThread(ti));
}
}
return ( sb.toString() );
}
}