/** Format deadlock displaying to a user. */
public static String prettyFormat(Collection<Dependency> deadlock) {
StringBuilder text = new StringBuilder();
LinkedHashSet<LocalThread> threads = new LinkedHashSet<LocalThread>();
Set<Object> seenDependers = new HashSet<>();
Object lastDependsOn = text;
Object lastDepender = text;
for (Dependency dep : deadlock) {
Object depender = dep.getDepender();
Object dependsOn = dep.getDependsOn();
String dependerString;
if (lastDependsOn.equals(depender)) {
dependerString = "which";
} else if (lastDepender.equals(depender)) {
dependerString = "and";
} else {
dependerString = String.valueOf(depender);
}
lastDepender = depender;
lastDependsOn = dependsOn;
String also = seenDependers.contains(depender) ? " also" : "";
seenDependers.add(depender);
if (depender instanceof LocalThread) {
text.append(dependerString)
.append(" is")
.append(also)
.append(" waiting on ")
.append(dependsOn)
.append("\n");
threads.add((LocalThread) depender);
} else if (dependsOn instanceof LocalThread) {
text.append(dependerString).append(" is held by thread ").append(dependsOn).append("\n");
threads.add((LocalThread) dependsOn);
} else {
text.append(dependerString)
.append(" is")
.append(also)
.append(" waiting for ")
.append(dependsOn)
.append("\n");
}
text.append("\n");
}
text.append("\nStack traces for involved threads\n");
for (LocalThread threadInfo : threads) {
text.append(threadInfo.getLocatility())
.append(":")
.append(threadInfo.getThreadStack())
.append("\n\n");
}
return text.toString();
}
public static void main(String[] args) throws InterruptedException {
SynchronizedMethod sync = new SynchronizedMethod();
LocalThread a = new LocalThread(sync, "Thread A");
LocalThread b = new LocalThread(sync, "Thread B");
LocalThread c = new LocalThread(sync, "Thread C");
a.start();
b.start();
c.start();
// a.join();b.join();c.join();
}
