package java.beans.beancontext;
import java.util.Iterator;
+import java.util.TooManyListenersException;
/**
* Allows a <code>BeanContext</code> to provide services to its children.
* @specnote it is unclear whether a <code>BeanContextServices</code>
* should delegate unhandled requests to parents. I assume so.
* @author John Keiser
- * @since JDK1.2
+ * @since 1.2
*/
-public interface BeanContextServices extends BeanContext, BeanContextServicesListener {
- /**
- * Register a service to make it available to others.
- * This class may refuse to add the service based on whatever
- * information it can gather, including whether the service
- * provider is trusted.
- *
- * @param serviceClass the service class.
- * @param provider the factory that will actually provide the service.
- * @return whether the service was added or not.
- */
- public boolean addService(Class serviceClass, BeanContextServiceProvider provider);
-
- /**
- * Make it so that no one else can use this service.
- * <P>
- *
- * If <code>revokeNow</code> is <code>false</code>, the only
- * effect of this method is to make all subsequent calls to
- * <code>getService()</code> on this service class fail.
- * <P>
- *
- * If it is <code>true</code>, a message is also sent out to all
- * listeners on the service and all references to it are released.
- *
- * @param serviceClass the service class to revoke.
- * @param provider the service provider providing the service class.
- * @param revokeNow whether to release all current references to
- * the service.
- */
- public void revokeService(Class serviceClass, BeanContextServiceProvider provider, boolean revokeNow);
-
- /**
- * Release your copy of this service.
- * <P>
- *
- * If all copies of the service's class have been relinquished by
- * the requestor, the <code>BeanContextServiceRevokedListener</code>
- * previously registered by <code>getService()</code> will be
- * unregistered.
- *
- * @param requestorChild the original <code>BeanContextChild</code>
- * requesting the service.
- * @param requestor the original requestor of the service.
- * @param service the service to relinquish
- * @see #getService(java.beans.beancontext.BeanContextChild,java.lang.Object,java.lang.Class,java.lang.Object,java.beans.beancontext.BeanContextServiceRevokedListener)
- */
- public void releaseService(BeanContextChild requestorChild, Object requestor, Object service);
-
- /**
- * Get a service from this <code>BeanContextServices</code>.
- * <P>
- *
- * The specified listener will be registered to receive a
- * revocation notice for the specified serviceClass. One
- * notification per service class per requestor object will be
- * sent.
- * <P>
- *
- * The listener will be unregistered when all services that were
- * obtained by that requestor for that service class are released.
- * <P>
- *
- * If the requested service class is not available, or if this
- * <code>BeanContextServices</code> object chooses not honor the
- * request because the service class has been revoked or for some
- * other reason, then this method will return <code>null</code>.
- * <P>
- *
- * This method may throw unchecked exceptions, so watch out.
- *
- * @specnote it is not specified what happens when two subsequent
- * calls are made to <code>getService()</code> with the
- * same requestor object and service class but different
- * listeners. Which listener is to be notified?
- *
- * @param requestorChild the <code>BeanContextChild</code>
- * associated with the requestor. Typically this will be
- * the same as the requestor itself, but since any
- * <code>Object</code>, even one outside the hierarchy, may
- * make a request, this parameter is necessary. Only weak
- * references to this will be retained, and it will never
- * be changed, only queried in a read-only manner.
- * @param requestor the actual requestor of the service. Only
- * weak references to this will be retained, and it will
- * never be changed, only queried in a read-only manner.
- * @param serviceClass the <code>Class</code> of the service being
- * requested.
- * @param serviceSelector a parameter to customize the service
- * returned with.
- * @param listener a listener that will be notified if the service
- * being requested is revoked.
- * @return an instance of <code>serviceClass</code> (such that
- * <code>instanceof</code> serviceClass is true), or
- * <code>null</code>.
- */
- public Object getService(BeanContextChild requestorChild, Object requestor, Class serviceClass, Object serviceSelector, BeanContextServiceRevokedListener listener);
-
- /**
- * Get a list of all service classes supported.
- * <P>
- *
- * This method must synchronize on
- * <code>BeanContext.globalHierarchyLock</code>.
- *
- * @return a list of all service classes supported.
- * @see java.beans.beancontext.BeanContext#globalHierarchyLock
- */
- public Iterator getCurrentServiceClasses();
-
- /**
- * Get a list of valid service selectors for the specified service class.
- * <P>
- *
- * If the specified service class does not have a finite number of
- * valid service selectors, it should return <code>null</code>.
- * If it takes a general <code>Integer</code> parameter, for
- * example, you may as well return <code>null</code> or the poor
- * soul who called this method will be iterating all day.
- * <P>
- *
- * If it has no valid service selectors, it should still return an empty
- * <code>Iterator</code>.
- *
- * @param serviceClass the service class to get selectors for.
- * @return a list of valid service selectors for the service
- * class, or <code>null</code>.
- */
- public Iterator getCurrentServiceSelectors(Class serviceClass);
-
- /**
- * Tell whether the specified service class is available.
- * Iff getService() could return a non-null value for the
- * specified service, this method will return <code>true</code>.
- *
- * @param serviceClass the service class to check on.
- * @return whether the specified service class is availabe.
- */
- public boolean hasService(Class serviceClass);
-
- /**
- * Add a listener on all adds and removes of services.
- * @param listener the listener to add.
- */
- public void addBeanContextServicesListener(BeanContextServicesListener listener);
-
- /**
- * Remove a listener on all adds and removes of services.
- * @specnote it is not certain whether this should remove this
- * listener if it was specified in
- * <code>getService()</code>.
- * @param listener the listener to add.
- */
- public void removeBeanContextServicesListener(BeanContextServicesListener listener);
+public interface BeanContextServices
+ extends BeanContext, BeanContextServicesListener
+{
+ /**
+ * Register a service to make it available to others.
+ * This class may refuse to add the service based on whatever
+ * information it can gather, including whether the service
+ * provider is trusted.
+ *
+ * @param serviceClass the service class.
+ * @param provider the factory that will actually provide the service.
+ * @return whether the service was added or not.
+ */
+ public boolean addService (Class serviceClass,
+ BeanContextServiceProvider provider);
+
+ /**
+ * Make it so that no one else can use this service.
+ * <P>
+ *
+ * If <code>revokeNow</code> is <code>false</code>, the only
+ * effect of this method is to make all subsequent calls to
+ * <code>getService()</code> on this service class fail.
+ * <P>
+ *
+ * If it is <code>true</code>, a message is also sent out to all
+ * listeners on the service and all references to it are released.
+ *
+ * @param serviceClass the service class to revoke.
+ * @param provider the service provider providing the service class.
+ * @param revokeNow whether to release all current references to
+ * the service.
+ */
+ public void revokeService (Class serviceClass,
+ BeanContextServiceProvider provider,
+ boolean revokeNow);
+
+ /**
+ * Release your copy of this service.
+ * <P>
+ *
+ * If all copies of the service's class have been relinquished by
+ * the requestor, the <code>BeanContextServiceRevokedListener</code>
+ * previously registered by <code>getService()</code> will be
+ * unregistered.
+ *
+ * @param requestorChild the original <code>BeanContextChild</code>
+ * requesting the service.
+ * @param requestor the original requestor of the service.
+ * @param service the service to relinquish
+ * @see #getService(java.beans.beancontext.BeanContextChild,java.lang.Object,java.lang.Class,java.lang.Object,java.beans.beancontext.BeanContextServiceRevokedListener)
+ */
+ public void releaseService (BeanContextChild requestorChild, Object requestor,
+ Object service);
+
+ /**
+ * Get a service from this <code>BeanContextServices</code>.
+ * <P>
+ *
+ * The specified listener will be registered to receive a
+ * revocation notice for the specified serviceClass. One
+ * notification per service class per requestor object will be
+ * sent.
+ * <P>
+ *
+ * The listener will be unregistered when all services that were
+ * obtained by that requestor for that service class are released.
+ * <P>
+ *
+ * If the requested service class is not available, or if this
+ * <code>BeanContextServices</code> object chooses not honor the
+ * request because the service class has been revoked or for some
+ * other reason, then this method will return <code>null</code>.
+ * <P>
+ *
+ * This method may throw unchecked exceptions, so watch out.
+ *
+ * @specnote it is not specified what happens when two subsequent
+ * calls are made to <code>getService()</code> with the
+ * same requestor object and service class but different
+ * listeners. Which listener is to be notified?
+ *
+ * @param requestorChild the <code>BeanContextChild</code>
+ * associated with the requestor. Typically this will be
+ * the same as the requestor itself, but since any
+ * <code>Object</code>, even one outside the hierarchy, may
+ * make a request, this parameter is necessary. Only weak
+ * references to this will be retained, and it will never
+ * be changed, only queried in a read-only manner.
+ * @param requestor the actual requestor of the service. Only
+ * weak references to this will be retained, and it will
+ * never be changed, only queried in a read-only manner.
+ * @param serviceClass the <code>Class</code> of the service being
+ * requested.
+ * @param serviceSelector a parameter to customize the service
+ * returned with.
+ * @param listener a listener that will be notified if the service
+ * being requested is revoked.
+ * @return an instance of <code>serviceClass</code> (such that
+ * <code>instanceof</code> serviceClass is true), or
+ * <code>null</code>.
+ */
+ public Object getService (BeanContextChild requestorChild, Object requestor,
+ Class serviceClass, Object serviceSelector,
+ BeanContextServiceRevokedListener listener)
+ throws TooManyListenersException;
+
+ /**
+ * Get a list of all service classes supported.
+ * <P>
+ *
+ * This method must synchronize on
+ * <code>BeanContext.globalHierarchyLock</code>.
+ *
+ * @return a list of all service classes supported.
+ * @see java.beans.beancontext.BeanContext#globalHierarchyLock
+ */
+ public Iterator getCurrentServiceClasses ();
+
+ /**
+ * Get a list of valid service selectors for the specified service class.
+ * <P>
+ *
+ * If the specified service class does not have a finite number of
+ * valid service selectors, it should return <code>null</code>.
+ * If it takes a general <code>Integer</code> parameter, for
+ * example, you may as well return <code>null</code> or the poor
+ * soul who called this method will be iterating all day.
+ * <P>
+ *
+ * If it has no valid service selectors, it should still return an empty
+ * <code>Iterator</code>.
+ *
+ * @param serviceClass the service class to get selectors for.
+ * @return a list of valid service selectors for the service
+ * class, or <code>null</code>.
+ */
+ public Iterator getCurrentServiceSelectors (Class serviceClass);
+
+ /**
+ * Tell whether the specified service class is available.
+ * Iff getService() could return a non-null value for the
+ * specified service, this method will return <code>true</code>.
+ *
+ * @param serviceClass the service class to check on.
+ * @return whether the specified service class is available.
+ */
+ public boolean hasService (Class serviceClass);
+
+ /**
+ * Add a listener on all adds and removes of services.
+ * @param listener the listener to add.
+ */
+ public void
+ addBeanContextServicesListener (BeanContextServicesListener listener);
+
+ /**
+ * Remove a listener on all adds and removes of services.
+ * @specnote it is not certain whether this should remove this
+ * listener if it was specified in
+ * <code>getService()</code>.
+ * @param listener the listener to add.
+ */
+ public void
+ removeBeanContextServicesListener (BeanContextServicesListener listener);
}
this (peer, lcle, true, true);
}
- public BeanContextServicesSupport (BeanContextServices peer, Locale lcle, boolean dtime)
+ public BeanContextServicesSupport (BeanContextServices peer, Locale lcle,
+ boolean dtime)
{
this (peer, lcle, dtime, true);
}
- public BeanContextServicesSupport (BeanContextServices peer, Locale lcle, boolean dtime, boolean visible)
+ public BeanContextServicesSupport (BeanContextServices peer, Locale lcle,
+ boolean dtime, boolean visible)
{
throw new Error ("Not implemented");
}
throw new Error ("Not implemented");
}
- public boolean addService (Class serviceClass, BeanContextServiceProvider bcsp)
+ public boolean addService (Class serviceClass, BeanContextServiceProvider bcsp)
{
throw new Error ("Not implemented");
}
- protected boolean addService (Class serviceClass, BeanContextServiceProvider bcsp, boolean fireEvent)
+ protected boolean addService (Class serviceClass,
+ BeanContextServiceProvider bcsp,
+ boolean fireEvent)
{
throw new Error ("Not implemented");
}
{
throw new Error ("Not implemented");
}
- protected void childJustRemovedHook (Object child, BeanContextSupport.BCSChild bcsc)
+
+ protected void childJustRemovedHook (Object child,
+ BeanContextSupport.BCSChild bcsc)
{
throw new Error ("Not implemented");
}
- protected BeanContextSupport.BCSChild createBCSChild (Object targetChild, Object peer)
+ protected BeanContextSupport.BCSChild createBCSChild (Object targetChild,
+ Object peer)
{
throw new Error ("Not implemented");
}
- protected BeanContextServicesSupport.BCSSServiceProvider createBCSSServiceProvider (Class sc, BeanContextServiceProvider bcsp)
+ protected BeanContextServicesSupport.BCSSServiceProvider
+ createBCSSServiceProvider (Class sc, BeanContextServiceProvider bcsp)
{
throw new Error ("Not implemented");
}
- protected final void fireServiceAdded (BeanContextServiceAvailableEvent bcssae)
+ protected final void fireServiceAdded (BeanContextServiceAvailableEvent bcssae)
{
throw new Error ("Not implemented");
}
throw new Error ("Not implemented");
}
- protected final void fireServiceRevoked (BeanContextServiceRevokedEvent bcsre)
+ protected final void
+ fireServiceRevoked (BeanContextServiceRevokedEvent bcsre)
{
throw new Error ("Not implemented");
}
- protected final void fireServiceRevoked (Class serviceClass, boolean revokeNow)
+ protected final void fireServiceRevoked (Class serviceClass,
+ boolean revokeNow)
{
throw new Error ("Not implemented");
}
throw new Error ("Not implemented");
}
- protected static final BeanContextServicesListener getChildBeanContextServicesListener (Object child)
+ protected static final BeanContextServicesListener
+ getChildBeanContextServicesListener (Object child)
{
throw new Error ("Not implemented");
}
throw new Error ("Not implemented");
}
- public Object getService (BeanContextChild child, Object requestor, Class serviceClass, Object serviceSelector, BeanContextServiceRevokedListener bcsrl)
+ public Object getService (BeanContextChild child, Object requestor,
+ Class serviceClass, Object serviceSelector,
+ BeanContextServiceRevokedListener bcsrl)
throws TooManyListenersException
{
throw new Error ("Not implemented");
throw new Error ("Not implemented");
}
- public void releaseService (BeanContextChild child, Object requestor, Object service)
+ public void releaseService (BeanContextChild child, Object requestor,
+ Object service)
{
throw new Error ("Not implemented");
}
- public void removeBeanContextServicesListener (BeanContextServicesListener bcsl)
+ public void
+ removeBeanContextServicesListener (BeanContextServicesListener bcsl)
{
throw new Error ("Not implemented");
}
- public void revokeService (Class serviceClass, BeanContextServiceProvider bcsp, boolean revokeCurrentServicesNow)
+ public void revokeService (Class serviceClass, BeanContextServiceProvider bcsp,
+ boolean revokeCurrentServicesNow)
{
throw new Error ("Not implemented");
}
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