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Swirlds is a software platform designed to build fully-distributed applications that harness the power of the cloud without servers. Now you can develop applications with fairness in decision making, speed, trust and reliability, at a fraction of the cost of traditional server-based platforms.
/*
* Copyright (C) 2018-2023 Hedera Hashgraph, LLC
*
* 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 com.swirlds.common.test.benchmark;
import com.swirlds.common.merkle.MerkleNode;
import com.swirlds.common.utility.AutoCloseableWrapper;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class MutableStateManager implements StateManager {
private S state;
private final Lock lock;
public MutableStateManager(final S initialState) {
this.state = initialState;
lock = new ReentrantLock();
}
/**
* {@inheritDoc}
*/
@Override
public AutoCloseableWrapper getState() {
lock.lock();
return new AutoCloseableWrapper<>(state, lock::unlock);
}
/**
* Lock the mutex.
*/
public void lock() {
lock.lock();
}
/**
* Unlock the mutex.
*/
public void unlock() {
lock.unlock();
}
/**
* Set the current mutable state. It is expected that this be called after {@link #lock} and before the
* corresponding {@link #unlock()}.
*/
public void setState(final S state) {
this.state = state;
}
}