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Dim body As String = String.Format("Response {0}", DateTime.Now.ToString("ffffff")) Dim header As String = String.Format("HTTP/1.1 200 OK" + ControlChars.NewLine + _ _ "Sequence-Number: {0}" + _ ControlChars.NewLine + _ "Content-Length: {1}" + _ ControlChars.NewLine, _ httpRequest.SequenceNumber, _ body.Length) Dim message As String = String.Format("{0}{1}{2}", header, ControlChars.NewLine, body) Dim bytes As Byte() = Encoding.UTF8.GetBytes(message) Dim stream As New NetworkStream(_socket) stream.Write(bytes, 0, bytes.Length) Dim requestBody As String = Encoding.UTF8.GetString(_httpRequest.Body) FireRequestProcessed(requestBody, _httpRequest.SequenceNumber, _ theProcessingTime, body) End Sub Public Event OnRequestProcessed(ByVal theRequest As String, _ ByVal theSequenceNumber As Integer, ByVal theDuration As Integer, _ ByVal theResponse As String) Public Sub FireRequestProcessed(ByVal theRequest As String, _ ByVal theSequenceNumber As Integer, ByVal theDuration As Integer, _ ByVal theResponse As String) RaiseEvent OnRequestProcessed(theRequest, theSequenceNumber, theDuration, theResponse) End Sub Public Event OnIdle() Public Sub FireIdle() RaiseEvent OnIdle() End Sub End Class When RequestProcessor gets a request to handle, it fires an OnIdle event to let the Coordinator simulate the processing time. The Coordinator uses a random number generator to pause the request thread for an amount of time between one and three seconds. I could have easily put the threadpausing code in RequestProcessor, but since this class is a worker, I opted to keep the thread-related code out of it and put it in the Coordinator where it belongs. The client program allows the user to run up to 200 requests at the same time. The upper limit is not determined as much by the software as it is by the hardware. HttpService uses an internal array of 500 ThreadSemaphores and therefore supports up to 500 concurrent requests, but the size of the array is arbitrary.

You can also create a new init.ora file from the SPFILE in the default location by using the following command: SQL> CREATE pfile FROM spfile; File created. SQL> If you bounce the database now, the instance will start up using your new SPFILE. Oracle will look for the initialization parameter lists in their default locations in the following order, and it will use the first one it finds: 1. It looks for the spfile$ORACLE_SID.ora file in the default location. 2. It looks for a file called spfile.ora in the default location. 3. It looks for the traditional init.ora file, with the name init$ORACLE_SID.ora, in the default location.

Although you can change the init.ora text file to your heart s content, don t try modifying the SPFILE directly. You ll end up corrupting it, and your instance may fail to start the next time you try to use the SPFILE!

Creating the SPFILE from the init.ora file doesn t mean that you can t use the init.ora file anymore. If you need to start the instance with the original init.ora file, you can do so as before by specifying it explicitly: SQL> STARTUP PFILE='/u01/app/oracle/product/10.1.0.2.0/dbs/initnina.ora'; However, you can t specify the SPFILE instead of the PFILE in the preceding example Oracle won t allow you to specify the SPFILE directly in a STARTUP command. However, you can do so indirectly by using a PFILE (init.ora) file that includes just one initialization parameter: the SPFILE parameter: spfile = ' /u01/app/oracle/product/10.1.0.2.0/dbs/spfilenina.ora After creating this new init.ora file, you can specify the PFILE variable in the STARTUP command, as shown earlier. Listing 10-8 shows the contents of the SPFILE (called SPFILEnina.ora) that was created from the initnina.ora file. Listing 10-8. A Sample SPFILE *.compatible='11.1.0.6' *.control_files='/u01/app/oracle/oradata/nina/control1.ctl', '/u01/app/oracle/oradata/nina/control2.ctl *.cursor_sharing='force' *.db_block_size=8192 *.db_domain='world' *.db_file_multiblock_read_count=16 *.db_files=1000 * db_flashback_retention_target=720 *.db_name='nina' *.db_recovery_file_dest='/u02/app/oracle/flash_recov_area' *.db_recovery_file_dest_size=1000M * instance_type='RDBMS' *.log_archive_dest_1='LOCATION=/u02/app/oracle/arch/'

Summary

*.log_archive_format='log%t_%s_%r.arc' *.pga_aggregate_target=1000M *.processes=600 *.remote_login_passwordfile='none' *.resumable_timeout=1800 *.sga_target=300M *.statistics_level='typical' *.undo_management='auto' *.undo_retention=7200 *.undo_tablespace='undotbs_01' *.

Tip It s customary for DBAs to place comments in the init.ora file, but the SPFILE will not include comment lines from the init.ora file. However, the SPFILE will retain comments placed on the same line as the parameter in the init.ora file (for example, CURSOR_SHARING=false # comment).

You now have an SPFILE that contains all your initialization parameters, and you can control whether any changes to the initialization parameters persist by being recorded in the SPFILE or not. Once you create an SPFILE, you can use a special SCOPE clause as part of all your ALTER SYSTEM commands that will determine whether the changes persist or not. The SCOPE clause can take the following three values: SPFILE MEMORY BOTH When the SCOPE clause is set to MEMORY, changes are merely temporary and they go away after the database is restarted. When the SCOPE clause is set to BOTH, all dynamic changes get recorded in the SPFILE and are operational in the instance immediately. When the SCOPE clause is set to SPFILE, changes aren t applied immediately but only get recorded in the SPFILE; dynamic and static configuration parameters become effective only after the next startup of the database. If the database instance is started with an SPFILE, SCOPE=BOTH is the default option used by Oracle.

With this case study, you ve seen how to use events and Coordinator teams to implement a multithreaded service component. I also showed you how to use events and Coordinator teams to create the supporting test programs. By developing HttpService as a component with no coupling to other components, HttpService is independently deployable. Moreover, because its worker classes are also completely decoupled from other classes, the workers are relatively simple to test and easy to reuse.