Cassandra Event Publisher
Cassandra event publisher dumps events in the map format to a Cassandra database.
Creating a Cassandra event publisher
For instructions on creating a Cassandra event publisher, see Creating Alerts .
Configuring adapter properties
Specify the Static Adapter Properties, when creating a Cassandra event publisher using the management console as shown below.
After entering the above adapter properties, select the Message Format which you want to apply on the published events . Also, click Advanced to define custom output mappings based on the Message Format you selected. For more information on custom output mapping types, see Output Mapping Types .
You can also d efine the respective adapter properties of the event publisher based on the transport type within the <to> element of the event publisher configuration in the <PRODUCT_HOME>/repository/deployment/server/eventpublishers/ directory as follows.
<eventPublisher name="CassandraOutputEventAdapter" statistics="disable" trace="disable" xmlns="http://wso2.org/carbon/eventpublisher">
........................
<to eventAdapterType="cassandra">
<property name="port">9160</property>
<property name="indexed.columns">key1,key2</property>
<property name="key.space.name">CEP_KS</property>
<property name="user.name">admin</property>
<property name="column.family.name">CF_Transactions</property>
<property name="hosts">testhost1,testhost2</property>
<property name="replication.factor">3</property>
<property encrypted="true" name="password">kuv2MubUUveMyv6GeHrXr9il59ajJIqUI4eoYHcgGKf/BBFOWn96NTjJQI+wYbWjKW6r79S7L7ZzgYeWx7DlGbff5X3pBN2Gh9yV0BHP1E93QtFqR7uTWi141Tr7V7ZwScwNqJbiNoV+vyLbsqKJE7T3nP8Ih9Y6omygbcLcHzg=</property>
<property name="strategy.class">SimpleStrategy</property>
</to>
</eventPublisher>
The above adapter properties are described below.
Adapter Property | Description | Configuration file property | Example |
|---|---|---|---|
| Hosts | Hostnames or IP addresses separated by commas | hosts | testhost1,testhost2 |
| Port | The Cassandra port. If you do not define this, the default port will be used | port | 9160 |
| User Name | Username for the database | user.name | admin |
| Password | Password for the database | password | admin |
| Keyspace Name | Cassandra keyspace name | key.space.name | CEP_KS |
| Column Family Name | Column family namespace under the defined keyspace | column.family.name | CF_Transactions |
| Strategy Class | The strategy of the keyspace. If you do not define this, org.apache.cassandra.locator.SimpleStrategy will be used | strategy.class | SimpleStrategy |
| Replication Factor | The replication factor of the keyspace. If you do not define this, 1 will be used. | replication.factor | 3 |
| Indexed Columns | Columns to be indexed, separated by commas. Index of type "KEYS" with the name | indexed.columns | key1,key2 |
Related samples
For more information on cassandra event publisher type, see the following sample in WSO2 CEP Documentation.