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Receiving asynchronous SOAP messages Receiving asynchronous SOAP messages via JAXM must be done via the J2EE web container, since there is currently no JAXM support in the Message Driven EJB construct. To receive asynchronous SOAP messages, you need to implement a servlet to receive the inbound messages and route them to other components as appropriate. JAXM provides a base servlet called JAXMServlet for use in these situations. Listing 4.5 is a JAXM servlet to handle the asynchronous product image updates described in listing 4.3.

ColumnName -----------------max_memory collect_call_stack occurrence_number Value ----4096 0 0 ObjectType ---------target event target ObjectName --------------------------------------------------ring_buffer scheduler_monitor_non_yielding_ring_buffer_recorded ring_buffer

We can see that this event session is used to locate non-yielding situations related to the scheduler monitor . The following query shows the events that this session is tracking:

Maintaining and Protecting Your Mobile PC The restore process takes the same amount of time as the backup process.

SELECT a.event_name AS EventName, CAST(a.event_predicate AS XML) AS Predicate FROM sys.dm_xe_sessions AS s INNER JOIN sys.dm_xe_session_events AS a ON s.address = a.event_session_address WHERE s.[name] = 'system_health' ORDER BY EventName;

The manufacturer generates a SOAP message whenever a product image has been updated. When the message arrives at the distributor, a JAXMServlet s onMessage method is called with a JAXM Message parameter. Our example servlet inspects the Message to obtain a reference to a JDOM Element that contains the method call parameters.

This returns the following results (wrapped and truncated for clarity):

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EventName Predicate --------------------------------------------------- --------------------------------------error_reported <or><leaf><comparator name="greater_than_equal_int64" package="package0" /><event name="error_reported" package="sqlserver" field="severity" /> <value>20</value></leaf> <or><or><or><or><or><or> <leaf><comparator name="equal_int64" package="package0" /><event scheduler_monitor_non_yielding_ring_buffer_recorded NULL wait_info Predicate too large for display wait_info_external Predicate too large for display xml_deadlock_report NULL

We can also see the actions associated with these events by running the following query:

SELECT a.event_name AS EventName, a.action_name AS ActionName FROM sys.dm_xe_sessions AS s INNER JOIN sys.dm_xe_session_event_actions AS a ON s.address = a.event_session_address WHERE s.[name] = 'system_health' ORDER BY EventName,ActionName;

Element productIdElem = message.getSOAPPart() .getSOAPEnvelope() .getSOAPBody() .getChild("productImage", Namespace .getNamespace("myco", "http://schemas.mycompany.com/Product-Images"));

This returns the following:

EventName -----------------error_reported error_reported error_reported error_reported wait_info wait_info wait_info wait_info_external wait_info_external wait_info_external ActionName ---------callstack session_id sql_text tsql_stack callstack session_id sql_text callstack session_id sql_text

This shows us the additional information that is being collected when these events occur . Finally, we can explore where the information for these events is being sent by executing the following command:

The JDOM Element is then inspected to determine the product identifier, type of image, and the identifier for the MIME block that contains the image data.

SELECT t.target_name AS TargetName, t.execution_count AS Executions, t.execution_duration_ms AS Duration, CAST(t.target_data AS XML) AS TargetData FROM sys.dm_xe_sessions AS s INNER JOIN sys.dm_xe_session_targets AS t ON s.address = t.event_session_address

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WHERE s.[name] = 'system_health' ORDER BY TargetName;

You can also use Windows System Restore to undo harmful changes to your computer and restore its settings and performance. System Restore monitors changes to the system and some program files, and creates easily identified restore points daily. Using restore points, you can revert the system to a previous time. If you know the date that the computer functioned properly, you can restore your computer to the previous state without losing your personal data files (such as Microsoft Word documents, browsing history, drawings, favorites, or e-mail messages).

String productId = productIdElem.getAttributeValue("id"); String imageType = productIdElem.getAttributeValue("type"); String mimeContentId = productIdElem.getChild("imageData") .getAttributeValue("href");

This command returns the following target list (wrapped for clarity):

TargetName Executions Duration TargetData ----------- ---------- -------- ------------------------------------------------ring_buffer 0 0 <RingBufferTarget eventsPerSec="0" processingTime="0" totalEventsProcessed="0" eventCount="0" droppedCount="0" memoryUsed="0" />

An interesting target that can be used with Extended Events is the Event Tracing for Windows (ETW) target . This allows Extended Events within SQL Server to be combined with events from other Windows services . ADO .NET has included support for ETW since v2 .0 . Although out of scope for this book, it s worth noting that ETW support makes it possible to trace an event from outside SQL Server, through the client stack, through SQL Server, and back to the client . If the ETW target is used, the SQL Server Service account needs to be a member of two Active Directory groups: the Performance Monitor Users group and the Performance Log Users group . Assigning (or modifying) the service account via SQL Server Configuration Manager can help ensure this . Stopping and Altering Event Sessions We can stop our event session by executing the following command:

The attachments are then inspected to locate the image data and save it to a file. The JAXM API assumes that more than one attachment is present in any message, so we must iterate over a collection of one in this case.

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