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//---PACKAGE DECLARATION--- |
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package uk.ac.ukc.iscream.refman; |
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package uk.org.iscream.cms.server.componentmanager; |
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//---IMPORTS--- |
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import org.omg.CORBA.ORB; |
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import org.omg.CosNaming.*; |
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import org.omg.PortableServer.*; |
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import uk.ac.ukc.iscream.core.*; |
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import uk.org.iscream.cms.server.core.*; |
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import uk.org.iscream.cms.server.util.*; |
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/** |
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* This class returns references for global system objects. |
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* This class is used to create and return references to objects |
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* that are required throughout the system. Most of which |
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* are CORBA based. It also handles ORB initialisation. |
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* are CORBA based. It also manages the ORB for the component. |
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* |
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* It is a singleton object with a static method to obtain a |
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* reference to it. This removes the need for passing |
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//---STATIC METHODS--- |
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/** |
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* This essentially formats the toString() source for an |
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* object wanting to make a log entry. |
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* This returns a reference to the single instance of the |
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* ReferenceManager. |
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* |
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* @param source the source of the call |
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* @param rev the CVS revision number of the caller |
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* This creates the single instance of the ReferenceManager |
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* if it does not exist by calling the private constructor. |
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* |
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* @return the formatted string |
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public static String logString(Object source, String rev) { |
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* @return a reference to the ReferenceManager |
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*/ |
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public synchronized static ReferenceManager getInstance() { |
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if (_instance == null) { |
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return "unamed{" + source.getClass().getName() + "}(" + rev.substring(11, rev.length() - 2) + ")"; |
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_instance = new ReferenceManager(); |
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} |
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return getInstance().getName() + "{" + source.getClass().getName() + "}(" + rev.substring(11, rev.length() - 2) + ")"; |
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return _instance; |
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} |
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` */ |
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|
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//---CONSTRUCTORS--- |
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|
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/** |
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* This creates the single instance of the ReferenceManager by |
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* calling the private constructor. If it is called twice, |
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* it detects an instance already exits and throws an exception. |
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* This is a private constructor |
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* This ensures that the system performs according to a Singleton design pattern |
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*/ |
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private ReferenceManager() { |
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_orb = ORB.init(new String[] {}, null); |
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} |
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|
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//---PUBLIC METHODS--- |
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|
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/** |
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* Obtains a CORBA reference through the naming service |
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* for the named object. |
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* Calls the dieWithError() if any exceptions happen! |
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* |
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* @param args the args to be passed to the ORB |
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* @param name the name of the component that will use this singleton |
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* @param name the name of the CORBA object to resolve |
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* |
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* @return a reference to the ReferenceManager |
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* @return a reference to the object |
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*/ |
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public org.omg.CORBA.Object getCORBARef(String name) { |
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org.omg.CORBA.Object objRef = null; |
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try { |
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objRef = getNS().resolve(getNS().to_name(name)); |
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} catch (org.omg.CosNaming.NamingContextPackage.CannotProceed e) { |
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dieWithError("\nCRITICAL:Naming Service Cannot Proceed - when resolving reference to " + name + "!\n" + |
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" Please check with your CORBA naming service provider."); |
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} catch (org.omg.CosNaming.NamingContextPackage.InvalidName e) { |
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dieWithError("\nCRITICAL:Invalid Name - when resolving reference to " + name + "!\n" + |
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" Please check with your CORBA naming service provider."); |
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} catch (org.omg.CosNaming.NamingContextPackage.NotFound e) { |
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recoverWithError("\nCRITICAL:Not Found - when resolving reference to " + name + "!\n" + |
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" Please check that this component is running."); |
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} |
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return objRef; |
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} |
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|
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/** |
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* Binds a given servant with the given name |
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* to the naming service. |
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* Calls the dieWithError() if any exceptions happen! |
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* |
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* @throws AlreadyInitialisedException if this method has already been called |
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* @param objRef a reverence to the servant object |
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* @param name the name to bind to the naming service with |
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*/ |
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public static ReferenceManager init(String[] args, String name) throws AlreadyInitialisedException { |
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if (_instance != null) { |
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throw new AlreadyInitialisedException("init has already been called"); |
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public void bindToOrb(org.omg.PortableServer.Servant objRef, String name) { |
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try { |
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getNS().bind(getNS().to_name(name), getRootPOA().servant_to_reference(objRef)); |
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} catch (org.omg.PortableServer.POAPackage.WrongPolicy e) { |
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dieWithError("\nCRITICAL:Wrong POA Policy - when binding " + name + "!\n" + |
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" This indicates an error with your ORB."); |
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} catch (org.omg.PortableServer.POAPackage.ServantNotActive e) { |
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dieWithError("\nCRITICAL:ServantNotActive - when binding " + name + "!\n" + |
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" This indicates an error with your ORB."); |
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} catch (org.omg.CosNaming.NamingContextPackage.InvalidName e) { |
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dieWithError("\nCRITICAL:Invalid Name - when binding " + name + "!\n" + |
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" Please check with your CORBA naming service provider."); |
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} catch (org.omg.CosNaming.NamingContextPackage.CannotProceed e) { |
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dieWithError("\nCRITICAL:Naming Service Cannot Proceed - when binding " + name + "!\n" + |
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" Please check with your CORBA naming service provider."); |
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} catch (org.omg.CosNaming.NamingContextPackage.NotFound e) { |
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recoverWithError("\nCRITICAL:Naming Service Not Found - when binding " + name + "!\n" + |
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" Please check with your CORBA naming service provider."); |
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} catch (org.omg.CosNaming.NamingContextPackage.AlreadyBound e) { |
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dieWithError("\nCRITICAL:Already Bound - when binding " + name + "!\n" + |
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" Another component with this name is already running."); |
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} |
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_instance = new ReferenceManager(args, name); |
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return _instance; |
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} |
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/** |
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* This returns a reference to the single instance of the |
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* ReferenceManager. |
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* Activates the POA |
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* Calls the dieWithError() if any exceptions happen! |
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*/ |
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public void activatePOA() { |
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try { |
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getRootPOA().the_POAManager().activate(); |
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} catch (org.omg.PortableServer.POAManagerPackage.AdapterInactive e) { |
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dieWithError("\nCRITICAL:POA Set Inactive - when trying to activate POA!\n" + |
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" This indicates an error with your ORB."); |
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} |
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} |
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|
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/** |
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* Overrides the {@link java.lang.Object#toString() Object.toString()} |
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* method to provide clean logging (every class should have this). |
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* |
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* @return a reference to the ReferenceManager |
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* This uses the uk.org.iscream.cms.server.util.NameFormat class |
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* to format the toString() |
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* |
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* @throws NotInitialisedException if the reference manager has not been initialised |
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* @return the name of this class and its CVS revision |
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*/ |
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public static ReferenceManager getInstance() throws NotInitialisedException { |
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if (_instance == null) { |
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throw new NotInitialisedException("attempt to obtain reference when not initialised"); |
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} |
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return _instance; |
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public String toString() { |
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return FormatName.getName( |
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_name, |
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getClass().getName(), |
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REVISION); |
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} |
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//---CONSTRUCTORS--- |
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//---PRIVATE METHODS--- |
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/** |
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* This is a private constructor |
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* This ensures that the system performs according to a Singleton design pattern |
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* If there are any CORBA errors this method is called with the |
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* error message. |
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* |
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* @param args the args to be passed to the ORB |
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* @param name the name of the component that will use this singleton |
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* The exception this throws is generic to CORBA communication |
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* problems, this is a Runtime exception and is typically only |
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* explicitly caught in the ComponentManager for the current VM |
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* The ComponentManager can then decide what course of action to |
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* take. |
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* |
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* Also, if it can, it will log the message with the logger. |
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* |
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* @param message the error message to die with |
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*/ |
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private ReferenceManager(String[] args, String name) { |
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_orb = ORB.init(args, null); |
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_name = name; |
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getLogger().write(toString(), Logger.SYSINIT, "created"); |
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private void recoverWithError(String message) throws ComponentCORBAException { |
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if (_logger != null) { |
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_logger.write(toString(), Logger.WARNING, "component CORBA error - " + message); |
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} |
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throw new ComponentCORBAException(message); |
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} |
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//---PUBLIC METHODS--- |
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/** |
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* Overrides the {@link java.lang.Object#toString() Object.toString()} |
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* method to provide clean logging (every class should have this). |
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* If there are any CORBA errors this method is called with the |
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* error message. |
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* |
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* @return the name of this class and its CVS revision |
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* Currently this prints the error, on the local err stream. Will |
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* print to the logger if one is available. |
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* |
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* ANY CALLS TO THIS METHOD CAUSE |
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* THE SYSTEM TO EXIT WITH A NON |
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* ZERO CODE! |
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* |
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* @param message the error message to die with |
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*/ |
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public String toString() { |
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return getName() + "{" + getClass().getName() + "}(" + REVISION.substring(11, REVISION.length() - 2) + ")"; |
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private void dieWithError(String message) { |
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System.err.println(message); |
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if (_logger != null) { |
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_logger.write(toString(), Logger.FATAL, message); |
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} |
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System.exit(1); |
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} |
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//---PRIVATE METHODS--- |
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|
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//---ACCESSOR/MUTATOR METHODS--- |
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/** |
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/** |
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* Returns a reference to the Root POA |
211 |
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* This will throw a RuntimeException if there is an error |
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* Calls the dieWithError() if any exceptions happen! |
212 |
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* |
213 |
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* @return the reference this class holds |
214 |
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*/ |
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try { |
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objRef = getORB().resolve_initial_references("RootPOA"); |
220 |
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} catch (org.omg.CORBA.ORBPackage.InvalidName e) { |
221 |
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throw new RuntimeException("CRITICAL:Unable to resolve reference to the RootPOA!\n" + |
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" This indicates an error with your ORB."); |
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dieWithError("\nCRITICAL:Unable to resolve reference to the RootPOA!\n" + |
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" This indicates an error with your ORB."); |
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} |
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_rootPOA = POAHelper.narrow(objRef); |
225 |
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} |
228 |
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|
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/** |
230 |
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* Returns a reference to the Naming Service |
231 |
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* This will throw a RuntimeException if there is an error |
231 |
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* Calls the dieWithError() if any exceptions happen! |
232 |
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* |
233 |
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* @return the reference this class holds |
234 |
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*/ |
238 |
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try { |
239 |
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objRef = getORB().resolve_initial_references("NameService"); |
240 |
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} catch (org.omg.CORBA.ORBPackage.InvalidName e) { |
241 |
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throw new RuntimeException("CRITICAL:Unable to resolve reference to the Naming Service!\n" + |
242 |
< |
" Please check with your CORBA naming service provider."); |
241 |
> |
dieWithError("\nCRITICAL:Unable to resolve reference to the Naming Service!\n" + |
242 |
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" Please check with your CORBA naming service provider."); |
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} |
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_ns = NamingContextExtHelper.narrow(objRef); |
245 |
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} |
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// check we managed to talk to the naming service |
247 |
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if (_ns == null) { |
248 |
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dieWithError("\nCRITICAL:Unable to resolve reference to the Naming Service!\n" + |
249 |
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" Please check with your CORBA naming service provider."); |
250 |
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} |
251 |
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return _ns; |
252 |
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} |
253 |
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|
254 |
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/** |
255 |
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* Returns a reference to the configuration manager |
256 |
< |
* This will throw a RuntimeException if there is an error |
256 |
> |
* Calls the dieWithError() if any exceptions happen! |
257 |
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* |
258 |
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* @return the reference this class holds |
259 |
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*/ |
260 |
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public ConfigurationManager getCM() { |
261 |
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if (_cm == null) { |
262 |
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org.omg.CORBA.Object objRef = null; |
176 |
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try { |
177 |
< |
objRef = getNS().resolve(getNS().to_name("iscream.ConfigurationManager")); |
178 |
< |
} catch (org.omg.CosNaming.NamingContextPackage.CannotProceed e) { |
179 |
< |
throw new RuntimeException("CRITICAL:Cannot Proceed - when resolving reference to iscream.ConfigurationManager!\n" + |
180 |
< |
" This indicates an error with your ORB."); |
181 |
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} catch (org.omg.CosNaming.NamingContextPackage.InvalidName e) { |
182 |
< |
throw new RuntimeException("CRITICAL:Invalid Name - when resolving reference to iscream.ConfigurationManager!\n" + |
183 |
< |
" This indicates an error with your ORB."); |
184 |
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} catch (org.omg.CosNaming.NamingContextPackage.NotFound e) { |
185 |
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throw new RuntimeException("CRITICAL:Not Found - when resolving reference to iscream.ConfigurationManager!\n" + |
186 |
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" Please check that this component is running."); |
187 |
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} |
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_cm = ConfigurationManagerHelper.narrow(objRef); |
262 |
> |
_cm = ConfigurationManagerHelper.narrow(getCORBARef("iscream.ConfigurationManager")); |
263 |
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} |
264 |
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// check we managed to talk to the configuration manager |
265 |
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if (_cm == null) { |
266 |
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dieWithError("\nCRITICAL:Unable to resolve reference to the Configuration Manager!\n" + |
267 |
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" Please check with your CORBA naming service provider."); |
268 |
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} |
269 |
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return _cm; |
270 |
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} |
271 |
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|
272 |
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/** |
273 |
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* Returns a reference to the logger |
274 |
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* This will throw a RuntimeException if there is an error |
274 |
> |
* This will throw a Error if there is an error |
275 |
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* |
276 |
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* @return the reference this class holds |
277 |
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*/ |
278 |
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public Logger getLogger() { |
279 |
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if (_logger == null) { |
280 |
< |
org.omg.CORBA.Object objRef = null; |
202 |
< |
try { |
203 |
< |
objRef = getNS().resolve(getNS().to_name("iscream.Logger")); |
204 |
< |
} catch (org.omg.CosNaming.NamingContextPackage.CannotProceed e) { |
205 |
< |
throw new RuntimeException("CRITICAL:Cannot Proceed - when resolving reference to iscream.Logger!\n" + |
206 |
< |
" This indicates an error with your ORB."); |
207 |
< |
} catch (org.omg.CosNaming.NamingContextPackage.InvalidName e) { |
208 |
< |
throw new RuntimeException("CRITICAL:Invalid Name - when resolving reference to iscream.Logger!\n" + |
209 |
< |
" This indicates an error with your ORB."); |
210 |
< |
} catch (org.omg.CosNaming.NamingContextPackage.NotFound e) { |
211 |
< |
throw new RuntimeException("CRITICAL:Not Found - when resolving reference to iscream.Logger!\n" + |
212 |
< |
" Please check that this component is running."); |
213 |
< |
} |
214 |
< |
_logger = LoggerHelper.narrow(objRef); |
280 |
> |
_logger = LoggerHelper.narrow(getCORBARef("iscream.Logger")); |
281 |
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} |
282 |
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return _logger; |
283 |
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} |
284 |
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|
219 |
– |
/** |
220 |
– |
* Returns a reference to the name |
221 |
– |
* |
222 |
– |
* @return the reference this class holds |
223 |
– |
*/ |
224 |
– |
public String getName() { |
225 |
– |
return _name; |
226 |
– |
} |
227 |
– |
|
285 |
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//---ATTRIBUTES--- |
286 |
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|
287 |
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/** |
310 |
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private Logger _logger; |
311 |
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|
312 |
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/** |
313 |
< |
* The name |
313 |
> |
* This is the friendly identifier of the |
314 |
> |
* component this class is running in. |
315 |
> |
* eg, a Filter may be called "filter1", |
316 |
> |
* If this class does not have an owning |
317 |
> |
* component, a name from the configuration |
318 |
> |
* can be placed here. This name could also |
319 |
> |
* be changed to null for utility classes. |
320 |
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*/ |
321 |
< |
private String _name; |
321 |
> |
private String _name = null; |
322 |
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|
323 |
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//---STATIC ATTRIBUTES--- |
324 |
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|
325 |
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/** |
326 |
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* A reference to the single instance of this class |
327 |
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*/ |
328 |
< |
private static ReferenceManager _instance; |
328 |
> |
private static ReferenceManager _instance = null; |
329 |
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} |