mirror of https://github.com/apache/cloudstack.git
133 lines
4.1 KiB
Java
133 lines
4.1 KiB
Java
/**
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* Copyright (C) 2010 Cloud.com, Inc. All rights reserved.
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*
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* This software is licensed under the GNU General Public License v3 or later.
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*
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* It is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package com.cloud.vm;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ScheduledExecutorService;
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import java.util.concurrent.TimeUnit;
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import org.apache.log4j.Logger;
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import com.cloud.cluster.StackMaid;
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import com.cloud.utils.Pair;
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import com.cloud.utils.concurrency.NamedThreadFactory;
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import com.cloud.utils.db.GlobalLock;
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import com.cloud.utils.db.Transaction;
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//
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// TODO: simple load scanner, to minimize code changes required in console proxy manager and SSVM, we still leave most of work at handler
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//
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public class SystemVmLoadScanner<T> {
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public enum AfterScanAction { nop, expand, shrink }
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private static final Logger s_logger = Logger.getLogger(SystemVmLoadScanner.class);
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private static final int ACQUIRE_GLOBAL_LOCK_TIMEOUT_FOR_COOPERATION = 3; // 3 seconds
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private final SystemVmLoadScanHandler<T> _scanHandler;
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private final ScheduledExecutorService _capacityScanScheduler;
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private final GlobalLock _capacityScanLock;
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public SystemVmLoadScanner(SystemVmLoadScanHandler<T> scanHandler) {
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_scanHandler = scanHandler;
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_capacityScanScheduler = Executors.newScheduledThreadPool(1, new NamedThreadFactory(scanHandler.getScanHandlerName()));
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_capacityScanLock = GlobalLock.getInternLock(scanHandler.getScanHandlerName() + ".scan.lock");
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}
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public void initScan(long startupDelayMs, long scanIntervalMs) {
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_capacityScanScheduler.scheduleAtFixedRate(getCapacityScanTask(), startupDelayMs, scanIntervalMs, TimeUnit.MILLISECONDS);
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}
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public void stop() {
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_capacityScanScheduler.shutdownNow();
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try {
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_capacityScanScheduler.awaitTermination(1000, TimeUnit.MILLISECONDS);
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} catch (InterruptedException e) {
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}
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_capacityScanLock.releaseRef();
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}
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private Runnable getCapacityScanTask() {
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return new Runnable() {
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@Override
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public void run() {
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Transaction txn = Transaction.open(Transaction.CLOUD_DB);
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try {
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reallyRun();
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} catch (Throwable e) {
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s_logger.warn("Unexpected exception " + e.getMessage(), e);
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} finally {
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StackMaid.current().exitCleanup();
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txn.close();
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}
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}
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private void reallyRun() {
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loadScan();
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}
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};
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}
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private void loadScan() {
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if(!_scanHandler.canScan()) {
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return;
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}
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if (!_capacityScanLock.lock(ACQUIRE_GLOBAL_LOCK_TIMEOUT_FOR_COOPERATION)) {
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if (s_logger.isTraceEnabled()) {
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s_logger.trace("Capacity scan lock is used by others, skip and wait for my turn");
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}
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return;
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}
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try {
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_scanHandler.onScanStart();
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T[] pools = _scanHandler.getScannablePools();
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for(T p : pools) {
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if(_scanHandler.isPoolReadyForScan(p)) {
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Pair<AfterScanAction, Object> actionInfo = _scanHandler.scanPool(p);
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switch(actionInfo.first()) {
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case nop:
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break;
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case expand:
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_scanHandler.expandPool(p, actionInfo.second());
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break;
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case shrink:
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_scanHandler.shrinkPool(p, actionInfo.second());
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break;
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}
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}
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}
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_scanHandler.onScanEnd();
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} finally {
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_capacityScanLock.unlock();
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}
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}
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}
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