/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.hyracks.control.nc.resources.memory;

import java.util.concurrent.atomic.AtomicLong;

import org.apache.hyracks.api.resources.memory.IMemoryManager;

public class MemoryManager implements IMemoryManager {
    private final long maxMemory;

    private final AtomicLong memory;

    public MemoryManager(long maxMemory) {
        this.maxMemory = maxMemory;
        this.memory = new AtomicLong(maxMemory);
    }

    @Override
    public long getMaximumMemory() {
        return maxMemory;
    }

    @Override
    public long getAvailableMemory() {
        return memory.get();
    }

    @Override
    public boolean allocate(long memory) {
        // commented as now the deallocation is not implemented yet.
        //        if (this.memory.addAndGet(-memory) < 0) {
        //            this.memory.addAndGet(memory);
        //            return false;
        //        }
        return true;
    }

    @Override
    public void deallocate(long memory) {
        this.memory.addAndGet(memory);
    }
}
