| /******************************************************************************* |
| * Copyright (c) 2000, 2004 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.search2.internal.ui; |
| |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.ProgressMonitorWrapper; |
| |
| public class ThrottlingProgressMonitor extends ProgressMonitorWrapper { |
| private float fThrottleRatio; |
| private long fLastCalled; |
| private long fSubMilis; |
| |
| public ThrottlingProgressMonitor(IProgressMonitor wrapped, float throttleRatio) { |
| super(wrapped); |
| fThrottleRatio= throttleRatio; |
| fSubMilis= 0; |
| fLastCalled= 0; |
| } |
| |
| public void internalWorked(double work) { |
| super.internalWorked(work); |
| if (fLastCalled != 0) { |
| long sleepTime= System.currentTimeMillis()-fLastCalled; |
| sleepTime *= fThrottleRatio; |
| sleepTime= Math.min(100, sleepTime); |
| if (sleepTime < 1) { |
| fSubMilis++; |
| if (fSubMilis > 50) { |
| sleepTime= 1; |
| fSubMilis= 0; |
| } |
| } |
| fLastCalled= System.currentTimeMillis(); |
| if (sleepTime > 0) { |
| try { |
| Thread.sleep(sleepTime); |
| } catch (InterruptedException e) { |
| // ignore |
| } |
| } else { |
| Thread.yield(); |
| } |
| } else { |
| fLastCalled= System.currentTimeMillis(); |
| } |
| } |
| } |