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package bjc.utils.funcutils;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.function.Supplier;
/**
* A wrapper around a {@link ReadWriteLock} to ensure that the lock is used
* properly.
*
* @author EVE
*/
public class LambdaLock {
/* The read lock. */
private final Lock readLock;
/* The write lock. */
private final Lock writeLock;
/** Create a new lambda-enabled lock around a new lock. */
public LambdaLock() {
this(new ReentrantReadWriteLock());
}
/**
* Create a new lambda-enabled lock.
*
* @param lck
* The lock to wrap.
*/
public LambdaLock(final ReadWriteLock lck) {
readLock = lck.readLock();
writeLock = lck.writeLock();
}
/**
* Execute an action with the read lock taken.
*
* @param supp
* The action to call.
*
* @return The result of the action.
*/
public <T> T read(final Supplier<T> supp) {
readLock.lock();
try {
return supp.get();
} finally {
readLock.unlock();
}
}
/**
* Execute an action with the write lock taken.
*
* @param supp
* The action to call.
*
* @return The result of the action.
*/
public <T> T write(final Supplier<T> supp) {
writeLock.lock();
try {
return supp.get();
} finally {
writeLock.unlock();
}
}
/**
* Execute an action with the read lock taken.
*
* @param action
* The action to call.
*/
public void read(final Runnable action) {
readLock.lock();
try {
action.run();
} finally {
readLock.unlock();
}
}
/**
* Execute an action with the write lock taken.
*
* @param action
* The action to call.
*/
public void write(final Runnable action) {
writeLock.lock();
try {
action.run();
} finally {
writeLock.unlock();
}
}
}
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