@Override
public synchronized void recycle() {
stateVerifier.throwIfRecycled();
this.isRecycled = true;
if (!isLocked) {
toWrap.recycle();
release();
}
}
public synchronized void unlock() {
stateVerifier.throwIfRecycled();
if (!isLocked) {
throw new IllegalStateException("Already unlocked");
}
this.isLocked = false;
if (isRecycled) {
recycle();
}
}
/**
* A resource that defers any calls to {@link Resource#recycle()} until after {@link #unlock()} is
* called.
*
* <p>If the resource was recycled prior to {@link #unlock()}, then {@link #unlock()} will also
* recycle the resource.
*/
final class LockedResource<Z> implements Resource<Z>, FactoryPools.Poolable {
private static final Pools.Pool<LockedResource<?>> POOL =
FactoryPools.threadSafe(
20,
new FactoryPools.Factory<LockedResource<?>>() {
@Override
public LockedResource<?> create() {
return new LockedResource<Object>();
}
});
private final StateVerifier stateVerifier = StateVerifier.newInstance();
private Resource<Z> toWrap;
private boolean isLocked;
private boolean isRecycled;
@SuppressWarnings("unchecked")
static <Z> LockedResource<Z> obtain(Resource<Z> resource) {
LockedResource<Z> result = (LockedResource<Z>) POOL.acquire();
result.init(resource);
return result;
}
private LockedResource() {}
private void init(Resource<Z> toWrap) {
isRecycled = false;
isLocked = true;
this.toWrap = toWrap;
}
private void release() {
toWrap = null;
POOL.release(this);
}
public synchronized void unlock() {
stateVerifier.throwIfRecycled();
if (!isLocked) {
throw new IllegalStateException("Already unlocked");
}
this.isLocked = false;
if (isRecycled) {
recycle();
}
}
@Override
public Class<Z> getResourceClass() {
return toWrap.getResourceClass();
}
@Override
public Z get() {
return toWrap.get();
}
@Override
public int getSize() {
return toWrap.getSize();
}
@Override
public synchronized void recycle() {
stateVerifier.throwIfRecycled();
this.isRecycled = true;
if (!isLocked) {
toWrap.recycle();
release();
}
}
@Override
public StateVerifier getVerifier() {
return stateVerifier;
}
}