jtulach@303: /*
jtulach@303:  * To change this template, choose Tools | Templates
jtulach@303:  * and open the template in the editor.
jtulach@303:  */
jtulach@303: 
jtulach@303: package org.apidesign.codeinjection;
jtulach@303: 
jtulach@303: import java.util.Iterator;
jtulach@303: import java.util.ServiceLoader;
jtulach@303: import org.apidesign.codeinjection.spi.CountDownExtender;
jtulach@303: 
jtulach@303: /** Second version to {@link CountDownImplV1} - imagine someone wants to
jtulach@303:  * reimplement {@link #down()} method to decrement by two not just by one.
jtulach@303:  * You do not like that idea at all, but you do not want to prevent such
jtulach@303:  * behaviour. You just do not want to maintain such bloody code. What can
jtulach@303:  * you do? You need to allow <b>code injection</b> via the
jtulach@303:  * {@link CountDownExtender} class!
jtulach@303:  *
jtulach@303:  * @author Jaroslav Tulach <jtulach@netbeans.org>
jtulach@303:  */
jtulach@303: final class CountDownImplV2 extends CountDown {
jtulach@303:     private int cnt;
jtulach@303: 
jtulach@303:     CountDownImplV2(int initial) {
jtulach@303:         this.cnt = initial;
jtulach@303:     }
jtulach@303: 
jtulach@303: // BEGIN: codeinjection.v2
jtulach@303:     public void down() {
jtulach@397:         Iterator<CountDownExtender> it =
jtulach@397:             ServiceLoader.load(CountDownExtender.class).iterator();
jtulach@303:         if (it.hasNext()) {
jtulach@303:             // injected behaviour
jtulach@303:             cnt = it.next().decrement(cnt);
jtulach@303:         } else {
jtulach@303:             // common behaviour of 1.0 version
jtulach@303:             cnt--;
jtulach@303:         }
jtulach@303:     }
jtulach@303: 
jtulach@303:     public boolean isDown() {
jtulach@303:         return cnt <= 0;
jtulach@303:     }
jtulach@303: // END: codeinjection.v2
jtulach@303: }