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package com.yahoo.concurrent.classlock;
import java.util.HashMap;
import java.util.Map;
import java.util.function.BooleanSupplier;
/**
* @author valerijf
*/
public class ClassLocking {
private final Map<String, ClassLock> classLocks = new HashMap<>();
private final Object monitor = new Object();
public ClassLock lock(Class<?> clazz) {
return lockWhile(clazz, () -> true);
}
public ClassLock lockWhile(Class<?> clazz, BooleanSupplier interruptCondition) {
synchronized (monitor) {
while (classLocks.containsKey(clazz.getName())) {
try {
monitor.wait();
} catch (InterruptedException ignored) {
}
if (!interruptCondition.getAsBoolean()) {
throw new LockInterruptException();
}
}
ClassLock classLock = new ClassLock(this, clazz);
classLocks.put(clazz.getName(), classLock);
return classLock;
}
}
void unlock(Class<?> clazz, ClassLock classLock) {
synchronized (monitor) {
if (classLock.equals(classLocks.get(clazz.getName()))) {
classLocks.remove(clazz.getName());
monitor.notifyAll();
} else {
throw new IllegalArgumentException("Lock has already been released");
}
}
}
public void interrupt() {
synchronized (monitor) {
monitor.notifyAll();
}
}
}
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