public final R acquire() {
Thread thread = Thread.currentThread();
R resource = current.get(thread);
if (resource == null) {
resources.acquireUninterruptibly();
List<R> garbage = null;
synchronized (unused) {
for (; ; ) {
resource = unused.poll();
if (resource == null) break;
if (isAlive(resource)) break;
if (garbage == null) garbage = new LinkedList<R>();
garbage.add(resource);
}
}
if (resource == null) {
resource = create();
}
current.put(thread, resource);
if (garbage != null) {
for (R dead : garbage) {
dispose(dead);
}
}
}
return resource;
}
public final void release() {
Thread thread = Thread.currentThread();
R resource = current.remove(thread);
if (resource != null) {
boolean dead = false;
synchronized (unused) {
if (unused.size() < maxUnused) {
unused.add(resource);
} else {
dead = true;
}
}
resources.release();
if (dead) dispose(resource);
}
}
public final void setMaxResources(int maxResources) {
resources.setPermits(maxResources);
}
