HTTP Event Publisher

HTTP event publisher is used to publish events in XML, JSON or text formats via HTTP and HTTPS transports.

Creating a HTTP event publisher

For instructions on creating a HTTP event publisher, see Configuring CEP to Create Alerts.

Configuring global properties

The following global properties can be set for the HTTP event publisher type in the <CEP_HOME>/repository/conf/input-event-adapters.xml file. These properties apply to all the publishers of the http type. If a global property available by default is removed, the default value of the property is considered.

Custom properties cannot be added as global properties.

Property Key	Description	Data Type	Default Value
`minThread`	The minimum number of threads (including idle threads) that should be available in the thread pool at a given time.	Integer	`8`
`maxThread`	The maximum number of threads (including idle threads) that should be available in the thread pool at a given time.	Integer	`100`
`keepAliveTimeInMillis`	The maximum number of milliseconds that idle threads should be kept alive when the total number of threads in the pool exceeds the number of cores in the machine.	Integer	`20000`
`jobQueueSize`	The size of the queue that is used to hold events before they are forwarded to the event stream.	Integer	`10000`
`defaultMaxConnectionsPerHost`	The maximum number of connections allowed per host configuration.	Integer	`50`
`maxTotalConnections`	The maximum number of connections allowed overall.	Integer	`1000`

Configuring adapter properties

Specify the Static and Dynamic Adapter Properties, when creating a HTTP event publisher using the management console as shown below.

HTTP event publisher

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 Publishing Events in Various Event Formats.

You can also define 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="HTTPOutputEventAdapter" statistics="disable" trace="disable" xmlns="http://wso2.org/carbon/eventpublisher">
  ....................
  <to eventAdapterType="http">
    <property name="http.client.method">HttpPost</property>
    <property name="http.username">admin</property>
    <property name="http.proxy.host">yourhost</property>
    <property name="http.proxy.port">8080</property>
    <property encrypted="true" name="http.password">kuv2MubUUveMyv6GeHrXr9il59ajJIqUI4eoYHcgGKf/BBFOWn96NTjJQI+wYbWjKW6r79S7L7ZzgYeWx7DlGbff5X3pBN2Gh9yV0BHP1E93QtFqR7uTWi141Tr7V7ZwScwNqJbiNoV+vyLbsqKJE7T3nP8Ih9Y6omygbcLcHzg=</property>
    <property name="http.headers">header1: value1, header2: value2</property>
    <property name="http.url">http://localhost:8080</property>
  </to>
</eventPublisher>

The above adapter properties are described below.

Static adapter properties

Adapter Property	Description	Configuration file property	Example
Proxy Host	The proxy server host	http.proxy.host	yourhost
Proxy Port	The proxy server port	http.proxy.port	8080
HTTP Client Method	The standard HTTP client method	http.client.method	HttpPost

Dynamic adapter properties

Adapter Property	Description	Configuration file property	Example
URL	The target HTTP/HTTPS URL	http.url	http://yourhost:8080/service or https://yourhost:8080/service
Username	HTTP BasicAuth username	http.username	admin
Password	HTTP BasicAuth password	http.password	admin
Headers	Custom HTTP headers	http.headers	header1: value1, header2: value2

Related samples

For more information on http event publisher type, see the following sample.

Sample 0062 - Publishing XML, JSON, and Custom Text Events via HTTP Transport