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Introduction

This sample demonstrates how to set up an execution plan with a basic pass-through query. It selects some of the attributes of each incoming event and emits an output event with the selected attributes. This sample uses wso2event for both inputs and outputs.

The query used in this sample is as follows:

from InMediationStatsStream
select meta_host, timestamp, resource_id, direction, fault_count, count
insert into OutMediationStatsStream;

In the The above query, we are going to process

• Processes the events received through the

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• InMediationStatsStream
• Selects the attributes (meta_host, timestamp, resource_id, direction, fault_count, count)

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• specified under the select clause, from each event received.
• Emits those events

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• as output events through the OutMediationStatsStream.

Since we are do not doing perform any processing apart from selecting a few attributes, this is considered as a pass-through query. 

This sample uses wso2event for both inputs and outputs.

Prerequisites

For a list of prerequisites, please refer to the prerequisites section in Setting up CEP Samples.

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Prerequisites

See Prerequisites in CEP Samples Setup page.

Building the sample

Start the WSO2 CEP server with the sample

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configuration numbered 0101. For instructions, see Starting sample CEP configurations. This sample configuration does the following:

• Creates <CEP_HOME>/repository/conf

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• /stream-manager-config.xml file, which is used to create the stream definitions

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• for the sample.

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• Points the default Axis2 repo

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• to

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• <CEP_HOME>/sample/artifacts/0101 (by default, the Axis2 repo is <CEP_HOME>/repository/deployment/server)

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• .

Executing the

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sample

1. Open

   another terminal and switch

   a new terminal, go to <CEP_HOME>/samples/consumers/wso2-event and run ant from there.

   This will build

   
   
   It builds the sample wso2event consumer and

   execute

   executes it.

   Note
   Do not close this terminal

   as it

   . It is required to keep the server running

   in order to receive events and view them

   and receiving events.

2. From Open another terminal switch , go to <CEP_HOME>/samples/producers/mediation-stats/ and run ant from there. This will build and run
   
   It builds and runs the wso2event producer, which will send some mediation statistics data to the CEP server. From this terminal, you will be able to view the details of the events sent

3. See the output events received from the CEP via the terminal opened in step 2.

   Info
   title Note
   To configure host, port, username, password and No. number of events, use -Dhost=xxxx -Dport=xxxx -Dusername=xxxx -Dpassword=xxxx -Devents=xx. For example : ant -Devents=10

4. Once the step 3 is done successfully, you will be able to see the output events received from the CEP via the terminal opened in step 2.

5. Below is the console For example, given below is a screenshot of the output of the consumer when sending 5 events from the producer. 

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1. :

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