io.helidon.webclient.http2.LockingStreamIdSequence Maven / Gradle / Ivy
/*
* Copyright (c) 2023, 2024 Oracle and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.helidon.webclient.http2;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
* A stream ID sequence that uses locks for concurrency.
*/
public class LockingStreamIdSequence {
private final AtomicInteger streamIdSeq = new AtomicInteger(0);
private final Lock lock = new ReentrantLock();
int lockAndNext() {
lock.lock();
return streamIdSeq.updateAndGet(o -> o % 2 == 0 ? o + 1 : o + 2);
}
void unlock() {
lock.unlock();
}
}