org.glassfish.grizzly.http.server.SuspendStatus Maven / Gradle / Ivy
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package org.glassfish.grizzly.http.server;
import org.glassfish.grizzly.ThreadCache;
/**
* The request/response suspend status bound to a specific thread.
*
* @author Alexey Stashok
*/
public final class SuspendStatus {
private static final ThreadCache.CachedTypeIndex CACHE_IDX =
ThreadCache.obtainIndex(SuspendStatus.class, 4);
public static SuspendStatus create() {
SuspendStatus status = ThreadCache.takeFromCache(CACHE_IDX);
if (status == null) {
status = new SuspendStatus();
}
assert status.initThread == Thread.currentThread();
status.state = State.NOT_SUSPENDED;
return status;
}
private enum State {
NOT_SUSPENDED, SUSPENDED, INVALIDATED
}
private State state;
private final Thread initThread;
private SuspendStatus() {
initThread = Thread.currentThread();
}
public void suspend() {
assert Thread.currentThread() == initThread;
if (state != State.NOT_SUSPENDED) {
throw new IllegalStateException("Can not suspend. Expected suspend state='" + State.NOT_SUSPENDED + "' but was '" + state +"'");
}
state = State.SUSPENDED;
}
boolean getAndInvalidate() {
assert Thread.currentThread() == initThread;
final boolean wasSuspended = (state == State.SUSPENDED);
state = State.INVALIDATED;
ThreadCache.putToCache(initThread, CACHE_IDX, this);
return wasSuspended;
}
public void reset() {
assert Thread.currentThread() == initThread;
state = State.NOT_SUSPENDED;
}
}