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1 /*
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2 * $Header: /cvshome/build/org.osgi.framework/src/org/osgi/framework/ServiceListener.java,v 1.15 2007/02/20 00:16:30 hargrave Exp $
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3 *
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4 * Copyright (c) OSGi Alliance (2000, 2007). All Rights Reserved.
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5 *
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6 * Licensed under the Apache License, Version 2.0 (the "License");
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7 * you may not use this file except in compliance with the License.
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8 * You may obtain a copy of the License at
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9 *
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10 * http://www.apache.org/licenses/LICENSE-2.0
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11 *
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 */
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18
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19 module org.osgi.framework.ServiceListener;
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20 import org.osgi.framework.ServiceEvent;
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21
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22 import java.lang.all;
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23 import java.util.EventListener;
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24
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25 /**
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26 * A <code>ServiceEvent</code> listener. <code>ServiceListener</code> is a
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27 * listener interface that may be implemented by a bundle developer. When a
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28 * <code>ServiceEvent</code> is fired, it is synchronously delivered to a
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29 * <code>ServiceListener</code>. The Framework may deliver
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30 * <code>ServiceEvent</code> objects to a <code>ServiceListener</code> out
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31 * of order and may concurrently call and/or reenter a
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32 * <code>ServiceListener</code>.
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33 *
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34 * <p>
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35 * A <code>ServiceListener</code> object is registered with the Framework
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36 * using the <code>BundleContext.addServiceListener</code> method.
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37 * <code>ServiceListener</code> objects are called with a
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38 * <code>ServiceEvent</code> object when a service is registered, modified, or
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39 * is in the process of unregistering.
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40 *
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41 * <p>
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42 * <code>ServiceEvent</code> object delivery to <code>ServiceListener</code>
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43 * objects is filtered by the filter specified when the listener was registered.
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44 * If the Java Runtime Environment supports permissions, then additional
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45 * filtering is done. <code>ServiceEvent</code> objects are only delivered to
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46 * the listener if the bundle which defines the listener object's class has the
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47 * appropriate <code>ServicePermission</code> to get the service using at
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48 * least one of the named classes under which the service was registered.
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49 *
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50 * <p>
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51 * <code>ServiceEvent</code> object delivery to <code>ServiceListener</code>
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52 * objects is further filtered according to package sources as defined in
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53 * {@link ServiceReference#isAssignableTo(Bundle, String)}.
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54 *
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55 * @see ServiceEvent
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56 * @see ServicePermission
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57 * @ThreadSafe
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58 * @version $Revision: 1.15 $
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59 */
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60
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61 public interface ServiceListener : EventListener {
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62 /**
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63 * Receives notification that a service has had a lifecycle change.
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64 *
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65 * @param event The <code>ServiceEvent</code> object.
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66 */
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67 public void serviceChanged(ServiceEvent event);
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68 }
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