org.jgroups.util.ProgressCheckRejectionPolicy Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
package org.jgroups.util;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;
/**
* Detects
*
* @author Radim Vansa <[email protected]>
* @since 1/29/13
*/
public class ProgressCheckRejectionPolicy implements RejectedExecutionHandler {
public final static String NAME = "progress_check";
/** Not changed count of executed tasks for this period will trigger an exception */
private long period = 10000;
private long last_completed = -1;
private long last_change = 0;
private RejectedExecutionHandler fallback = null;
public ProgressCheckRejectionPolicy(String rejection_policy) {
String policy = rejection_policy.toLowerCase();
if (!policy.startsWith(NAME)) {
throw new IllegalStateException(rejection_policy);
}
policy = policy.substring(NAME.length());
if (policy.startsWith("=")) {
String[] attributes = policy.substring(1).split(",", 0);
for (String attribute : attributes) {
String[] parts = attribute.split(":");
if (parts.length != 2) {
throw new IllegalArgumentException("Attribute '" + attribute + "' in " + rejection_policy);
}
String key = parts[0].trim();
String value = parts[1].trim();
if (key.equals("period")) {
try {
period = Long.parseLong(value);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("Cannot parse period value in " + rejection_policy, e);
}
} else if (key.equals("fallback")) {
// in order to be able to define also different policy with attributes (use as the last attribute)
fallback = Util.parseRejectionPolicy(rejection_policy.substring(rejection_policy.indexOf("fallback:") + 9));
}
}
}
}
@Override
public synchronized void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
long completed = executor.getCompletedTaskCount();
if (completed < last_completed) {
throw new IllegalStateException("Number of completed tasks shouldn't decrease");
} else if (completed == last_completed) {
long now = System.currentTimeMillis();
if (now - last_change > period) {
String message = String.format(
"No progress for %d ms, possible distributed deadlock. Try raising threadpool size\n" +
"\tMin size: %d\n\tMax size: %d\n\tCurrent size: %d\n\tActive: %d\n\tLargest size: %d\n" +
"\tCompleted tasks: %d\n\tTotal scheduled: %d",
now - last_change, executor.getCorePoolSize(), executor.getMaximumPoolSize(),
executor.getPoolSize(), executor.getActiveCount(), executor.getLargestPoolSize(),
executor.getCompletedTaskCount(), executor.getTaskCount());
throw new NoProgressException(message);
}
} else {
last_change = System.currentTimeMillis();
last_completed = completed;
}
if (fallback != null) {
fallback.rejectedExecution(r, executor);
}
}
}