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/* |
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* The Apache Software License, Version 1.1 |
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* |
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* Copyright (c) 2003 The Apache Software Foundation. All rights |
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* reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, if |
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* any, must include the following acknowlegement: |
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* "This product includes software developed by the |
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* Apache Software Foundation (http://www.apache.org/)." |
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* Alternately, this acknowlegement may appear in the software itself, |
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* if and wherever such third-party acknowlegements normally appear. |
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* |
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* 4. The names "Ant" and "Apache Software |
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* Foundation" must not be used to endorse or promote products derived |
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* from this software without prior written permission. For written |
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* permission, please contact apache@apache.org. |
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* |
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* 5. Products derived from this software may not be called "Apache" |
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* nor may "Apache" appear in their names without prior written |
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* permission of the Apache Group. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of the Apache Software Foundation. For more |
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* information on the Apache Software Foundation, please see |
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* <http://www.apache.org/>. |
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*/ |
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package org.apache.tools.ant.taskdefs; |
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import org.apache.tools.ant.Task; |
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import org.apache.tools.ant.BuildException; |
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import org.apache.tools.ant.Project; |
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/** |
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* A task to provide "nice-ness" to the current thread, and/or to |
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* query the current value. |
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* Examples: |
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* <pre> <Nice currentPriority="current.value" ></pre><p> |
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* Set <code>currentPriority</code> to the current priority |
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* <pre> <Nice newPriority="10" ></pre><p> |
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* Raise the priority of the build process (But not forked programs) |
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* <pre> <Nice currentPriority="old" newPriority="3" ></pre><p> |
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* Lower the priority of the build process (But not forked programs), and save |
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* the old value to the property <code>old</code>. |
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* |
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* @ant.task name="Nice" category="optional" |
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*/ |
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public class Nice extends Task { |
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/** |
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* the new priority |
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*/ |
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private Integer newPriority; |
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/** |
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* the current priority |
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*/ |
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private String currentPriority; |
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/** |
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* Execute the task |
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* @exception BuildException if something goes wrong with the build |
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*/ |
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public void execute() throws BuildException { |
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Thread self = Thread.currentThread(); |
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int priority = self.getPriority(); |
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if(currentPriority!=null) { |
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String current=Integer.toString(priority); |
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getProject().setNewProperty(currentPriority,current); |
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} |
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//if there is a new priority, and it is different, change it |
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if(newPriority!=null && priority!=newPriority.intValue()) { |
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try { |
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self.setPriority(newPriority.intValue()); |
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} catch (SecurityException e) { |
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//catch permissions denial and keep going |
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log("Unable to set new priority -a security manager is in the way", |
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Project.MSG_WARN); |
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} catch(IllegalArgumentException iae) { |
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throw new BuildException("Priority out of range",iae); |
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} |
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} |
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} |
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/** |
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* The name of a property to set to the value of the current |
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* thread priority. Optional |
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* @param currentPriority |
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*/ |
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public void setCurrentPriority(String currentPriority) { |
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this.currentPriority = currentPriority; |
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} |
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/** |
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* the new priority, in the range 1-10. |
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* @param newPriority |
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*/ |
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public void setNewPriority(int newPriority) { |
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if(newPriority<Thread.MIN_PRIORITY || newPriority>Thread.MAX_PRIORITY) { |
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throw new BuildException("The thread priority is out of the range 1-10"); |
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} |
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this.newPriority = new Integer(newPriority); |
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} |
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} |
Steve Loughran