/*
* Copyright 2012-present Facebook, Inc.
*
* 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.facebook.buck.step.fs;
import java.util.concurrent.Semaphore;
public class XzMemorySemaphore {
private static final int[] XZ_MEMORY_USAGE_MB = {1, 1, 1, 5, 10, 20, 40, 85, 175, 600};
private static final int MAX_MEMORY = (int) (Runtime.getRuntime().maxMemory() / 2 / 1024 / 1024);
private static final Semaphore memorySemaphore = new Semaphore(MAX_MEMORY);
private XzMemorySemaphore() {}
static void acquireMemory(int xzCompressionLevel) {
try {
memorySemaphore.acquire(XZ_MEMORY_USAGE_MB[xzCompressionLevel]);
} catch (InterruptedException exp) {
// ignore it
}
}
static void releaseMemory(int xzCompressionLevel) {
memorySemaphore.release(XZ_MEMORY_USAGE_MB[xzCompressionLevel]);
}
}