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Not all languages even relatively recent ones support method references directly. A notable case is Java. However, this language does support reflection, a run-time process to get class and object metadata. You can use reflection as a workaround to obtain a direct reference to a method, using the built-in class java.lang.reflect.Method to call an untyped target method directly. To fire an event using a Method object, its invoke method must be called, with a parameter identifying which object to call. The Java code fragment in Listing 8-8 shows the essentials. Listing 8-8. Using Reflection in Java to Fire Events to Untyped Targets public class EventSource { private java.lang.reflect.Method onEventX; private Object eventTarget; public void methodThatFiresAnEvent() { // do something... // fire an event if (onEventX == null) return; if (eventTarget == null) return; try { onEventX.invoke(eventTarget, null); } // method to invoke // object that owns method

1 1 1 1 1

/u01/app/oracle/diag/rdbms/orcl2/ orcl2/alert Diag Incident /u01/app/oracle/diag/rdbms/orcl2/ orcl2/incident Diag Cdump /u01/app/oracle/diag/rdbms/orcl2/ orcl2/cdump Health Monitor /u01/app/oracle/diag/rdbms/orcl2/ orcl2/hm1 Def Trace File /u01/app/oracle/diag/rdbms/orcl2/ orcl2/trace /orcl2_ora_4813.trc Active Problem Count 2 Active Incident Count 4

11 rows selected. SQL> The following directories bear examination: ADR Base is the directory path for the ADR base. ADR Home is the ADR home for the instance. Diag Trace contains the text-based alert log. Diag Alert contains the XML-formatted alert log. Diag Incident is the directory for storing incident packages that you create.

catch (Exception ex) {...} //... } } This example shows an event source that can handle only a single subscriber. To support multicasting, you would need to use collections to store the Method and Object references. The second parameter passed to Method.invoke is an optional array of parameters.

The new ADRCI is a command-line utility to help you interact with the ADR. You can use ADRCI to view diagnostic data, create incident packages, and view Health Monitor reports. You invoke ADRCI by simply typing adrci at the command line: $ adrci ADRCI: Release 11.1.0.6.0 - Beta on Thu Sep 27 16:59:27 2007 Copyright (c) 1982, 2007, Oracle. All rights reserved. ADR base = "/u01/app/oracle" adrci> Type the help command to view the commands you can use at the ADRCI prompt. When you would like to leave the ADRCI utility, type exit or quit. You can also use ADRCI in batch mode, which lets you use ADRCI commands within shell scripts and batch files. You must use the command-line parameters exec and script to execute ADRCI in batch mode, as shown here: adrci exec 'command [; comamnd]. . . ' adrci script=file_name

If you have multiple Oracle instances, all of them will be current when you log into ADRCI. There are some ADRCI commands that work when you have multiple ADR homes current, but others require only a single instance to be current. The default behavior for the ADR homepath is for it to be null when you start up ADRCI. When the ADR home is null, all ADR homes are current. Here s an example: adrci> show homes adrci> ADR Homes: diag/rdbms/orcl/orcl diag/rdbms/orcl2/orcl2 diag/rdbms/eleven/eleven diag/rdbms/nina/nina adrci> All ADR homes are always shown relative to the ADR base. Thus, if the ADR base is /u01/app/ oracle and the database name and SID are both named orcl1, the ADR homepath s complete directory path would be /u01/app/oracle/diag/rdbms/orcl1/orcl1. In the example shown here, the ADR homepath indicates that multiple ADR homes are current. You can set the ADR path to point to a single instance by executing the SET HOMEPATH command.

adrci> set homepath diag/rdbms/orcl1/orcl1 adrci> show homes ADR Homes: diag/rdbms/orcl1/orcl1 adrci> Now, when you issue an adrci command, the database will fetch diagnostic data only from the orcl1 instance.

A typed object call uses this implementation pattern: ICallee calleeInstance; // initialize calleeInstance... // invoke a method through the interface calleeInstance.methodName(); To call a typed target is to invoke a method of a target object through an interface. The caller must obviously know the callee s type (either its class or one of its interfaces), so typed object calls introduce type coupling between caller and callee even if the called method has a universal signature. The method invoked belongs to the callee s class, or one of the interfaces it implements. Depending on where the callee s class or interface is defined with respect to the caller, there are four coupling scenarios, as shown in Figure 8-5 through Figure 8-8.