Ibm WebSphere Adapters Manual do Utilizador Página 197
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If you use the FFDCSupport aspect, you can ensure a consistent FFDC policy for
your application by adding declare warning or error advice to your aspects While this
capability is not explicitly provided by the FFDCSupport aspect, you can leverage
the use of AspectJ and follow a standard pattern of enforcing a policy
implemented using an aspect with compiler warnings or errors.
In Figure 6, aspect Example_6 illustrates how to prevent direct use of the FFDC API
or undesired dumping of exception messages and stack traces to the console. The
declare warning statements on lines 51 and 57 instruct the AspectJ compiler to
issue warnings during weaving if join points are matched by the accompanying
pointcuts on lines 48 and 54 respectively.
The statements are only evaluated during compilation and have no impact on the
runtime.
import com.ibm.websphere.ffdc.FFDCSupport;
public aspect Example_3 extends FFDCSupport {
protected pointcut ffdcScope () :
within(com.foo.*)
&& !within(com.foo.Goo);
}
In Figure 3 aspect Example_3 has the same effect as Example_1 except it excludes FFDC for class com.foo.Goo by
using the && and ! operators to form a pointcut expression.
Figure 9. Add FFDC to all classes in the com.foo package excluding com.foo.Goo
import com.ibm.websphere.ffdc.FFDCSupport;
public aspect Example_3 extends FFDCSupport {
protected pointcut ffdcScope () :
within(com.foo.*)
&& !withincode(* com.foo.Goo.aMethod(..));
}
In Figure 4, aspect Example_4 is also similar to Example_1, however FFDC is excluded from a particular method on
line 30 using the withincode() PCD.
Figure 10. Add FFDC to the com.foo package but exclude aMethod
import com.ibm.websphere.ffdc.FFDCSupport;
public aspect Example_4 extends FFDCSupport {
protected pointcut ffdcScope () :
within(com.foo.*)
&& !args(ClassNotFoundException);
}
In Figure 5 aspect Example_5 illustrates how to account for a programming by exception, where certain exceptions are
not considered to be a failure and should not be reported. In the example, the handling of ClassNotFoundException
will not be reported to FFDC. The args() PCD on line 39 selects a join points based on contextual information in this
case the exception passed to the handler join point.
Figure 11. Add FFDC to the com.foo package but exclude catch blocks for ClassNotFoundException handling
WebSphere Adapter development overview 191
- WebSphere 1
- Contents 5
- WebSphere Adapter Toolkit 7
- IBM WebSphere Adapters 8
- Business 9
- Architectural overview 10
- JCA connector component 11
- Metadata 13
- Operating system requirements 17
- Samples overview 18
- Developer 19
- Modify the module 30
- Test the sample 31
- Troubleshooting the samples 34
- Specify project properties 37
- Specify project facets 38
- Specify generation options 40
- Data Binding classes 44
- Using the Overview pane 64
- Generated bean properties 73
- Data model 75
- After-images versus deltas 76
- Verbs versus operations 77
- Business object standards 77
- Inbound event notification 85
- Event Store Requirements 87
- Adapter Requirements 87
- Application Requirements 87
- Transaction Support Methods 93
- One way callback events 96
- Callback event sender 97
- Outbound support 103
- Application sign-on 104
- Implementing outbound support 105
- Using command patterns 111
- Data and metadata 121
- The Metadata API 125
- Factory classes 126
- Interfaces 126
- Interface Type: 127
- Types of enterprise metadata 130
- Metadata discovery 133
- OutboundConnectionType 134
- InboundConnectionType 135
- MetadataConnection 136
- Namespace definition 142
- Implementing a data handler 164
- Implementing a data binding 165
- Discovery-service.xml 168
- Initialize input method 169
- Initialize output method 169
- Set managed connection method 170
- Get next method 170
- Clone method 171
- Close method 171
- Extract method 171
- Data binding implementation 172
- DataBinding generator 173
- Problem determination 174
- Logging and tracing messages 180
- Validating the code 199
- Developing JUnit tests 201
- Installing the test client 204
- Saving business object data 205
- Using an execution trace 206
- Testing inbound functionality 206
- WebSphere Application Server 209
- Reference 214
- Terminology 214
- Trademarks and service marks 219
- Printed in USA 226
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