
net.openhft.chronicle.map.MapMethodsSupport Maven / Gradle / Ivy
/*
* Copyright 2012-2018 Chronicle Map Contributors
*
* 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 net.openhft.chronicle.map;
final class MapMethodsSupport {
private MapMethodsSupport() {
}
static void returnCurrentValueIfPresent(
MapQueryContext, V, ?> q, ReturnValue returnValue) {
MapEntry, V> entry = q.entry();
if (entry != null)
returnValue.returnValue(entry.value());
}
static boolean tryReturnCurrentValueIfPresent(
MapQueryContext, V, ?> q, ReturnValue returnValue) {
if (q.readLock().tryLock()) {
MapEntry, V> entry = q.entry();
if (entry != null) {
returnValue.returnValue(entry.value());
return true;
}
// Key is absent
q.readLock().unlock();
}
q.updateLock().lock();
MapEntry, V> entry = q.entry();
if (entry != null) {
returnValue.returnValue(entry.value());
return true;
}
return false;
}
}
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