[CONF] Apache ServiceMix: servicemix-snmp (page created)

Fri, 17 Oct 2008 07:09:03 -0700

Page Created : SM : servicemix-snmp

servicemix-snmp has been created by Lars Heinemann (Oct 17, 2008).

Content:

ServiceMix SNMP

The ServiceMix SNMP component provides support for receiving SNMP events via the enterprise service bus by using the SNMP4J library.

Availability

Note that this component is only available in releases >= 3.3.

Installation

Installing the servicemix-snmp component can be done in several ways:

  • drop the installer zip in an hotdeploy directory monitored by ServiceMix
  • using ant tasks

Note that when using ant tasks, the component is not started, you will have to start it manually using ant tasks or a console.

Creation

You can use Maven to create a service unit.

mvn archetype:create \
    -DarchetypeGroupId=org.apache.servicemix.tooling \
    -DarchetypeArtifactId=servicemix-snmp-service-unit \
    -DgroupId=com.mycompany.myproduct \
    -DartifactId=mycomponent.artifact



Endpoints



Polling (consumer) endpoint


<snmp:poller service="test:mySNMPService"
             endpoint="pollerEndpoint"
             targetService="test:myProcessor"
             period="10000"
             address="udp:192.168.2.122/161"
             file="classpath:myOIDList.txt" />






Consumer Endpoint (Polling)



Message Exchange Pattern


The poller endpoint will only generate InOnly exchanges.




The following table shows the additional configuration possibilities of the endpoint other than the configuration of the default PollingEndpoint class.



Poller endpoint attributes





 Name 		
 Type 	
 Description 							
 Default 				




 file  		
 Resource	
 sets the resource file containing all OIDs to poll (separated by line feeds)	
 null (must be spec'd)			




 address		
 String	
 the address to use for snmp connection				
 null (must be spec'd)			




 marshaler		
 class		
 org.apache.servicemix.snmp.marshaler.SnmpMarshalerSupport		
 DefaultSnmpMarshaler			




 retries		
 int	        
 the retries for requesting the values via snmp			
 2			




 timeout               
 long          
 the timeout in millis for a request to be answered    
 1500 




 snmpVersion		
 int   	
 the snmp version to use (see SnmpConstants)		
 0 (v1)			




 snmpCommunity  	
 String	
 the snmp community		
 "public"		





 

 




The address


The address has to be specified in the following way:




 
Template: <protocol>:<ip-address>/<port>

Example:  udp:192.168.2.122/161




 



Poller endpoint attributes





 Name 		
 Description				




 protocol	        
 the protocol to use (udp / tcp)




 ip-address		
 the ip address of the device to poll from




 port		        
 the port number





 

 




Provider Endpoint (Sending)



Availability


There is no sender endpoint yet.




For all xbean file endpoint configuration take a look at Xml schemas




Marshalers



You can write your own marshalers for conversion between snmp and normalized message.

To do this you simply need to implement the org.apache.servicemix.snmp.marshaler.SnmpMarshalerSupport interface or by creating a subclass of the DefaultSnmpMarshaler if you do not want to start from scratch.




The SnmpMarshalerSupport interface


For providing your own marshaler you only need to implement a single methods:




convertToJBI(...)


This method is responsible for translating a received snmp response into a jbi compliant normalized message ready to be sent to the bus.



After finishing your marshaler you can simply configure your endpoints to use it:



Marshaler example


<snmp:poller service="test:mySNMPService"
             endpoint="pollerEndpoint"
             targetService="test:myProcessor"
             period="10000"
             address="udp:192.168.2.122/161"
             file="classpath:myOIDList.txt">

    <property name="marshaler">
        <bean class="com.mycompany.MySNMPMarshaler" />
    </property>

</snmp:poller>






How does the DefaultSnmpMarshaler work?



Given the situation, that I provide a file like this:



myOIDList.txt


1.3.6.1.2.1.1.3.0
1.3.6.1.2.1.25.3.2.1.5.1
1.3.6.1.2.1.25.3.5.1.1.1
1.3.6.1.2.1.43.5.1.1.11.1






The result will be the following:




Result of DefaultSnmpMarshaler


<?xml version="1.0" encoding="UTF-8"?>
<snmp>
  <entry>
    <oid>1.3.6.1.2.1.1.3.0</oid>
    <value>6 days, 21:14:28.00</value>
  </entry>
  <entry>
    <oid>1.3.6.1.2.1.25.3.2.1.5.1</oid>
    <value>2</value>
  </entry>
  <entry>
    <oid>1.3.6.1.2.1.25.3.5.1.1.1</oid>
    <value>3</value>
  </entry>
  <entry>
    <oid>1.3.6.1.2.1.43.5.1.1.11.1</oid>
    <value>6</value>
  </entry>
  <entry>
    <oid>1.3.6.1.2.1.1.1.0</oid>
    <value>My Very Special Printer Of Brand Unknown</value>
  </entry>
</snmp>






As you maybe recognized there is one more result than requested....1.3.6.1.2.1.1.1.0.

This one is filled in by the device automatically in this special case. So it may absolutely happen, that you receive more than you requested...be prepared.

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