org.apache.solr.cloud.autoscaling

Class HttpTriggerListener

java.lang.Object

org.apache.solr.cloud.autoscaling.TriggerListenerBase

org.apache.solr.cloud.autoscaling.HttpTriggerListener

All Implemented Interfaces:

Closeable, AutoCloseable, TriggerListener

public class HttpTriggerListener
extends TriggerListenerBase

Simple HTTP callback that POSTs event data to a URL. URL, payload and headers may contain property substitution patterns, with the following properties available:

• config.* - listener configuration
• event.* - event properties
• stage - current stage of event processing
• actionName - optional current action name
• context.* - optional ActionContext properties
• error - optional error string (from Throwable.toString())
• message - optional message

The following listener configuration is supported:

• url - a URL template
• payload - string, optional payload template. If absent a JSON map of all properties listed above will be used.
• contentType - string, optional payload content type. If absent then application/json will be used.
• header.* - string, optional header template(s). The name of the property without "header." prefix defines the literal header name.
• timeout - int, optional connection and socket timeout in milliseconds. Default is 60 seconds.
• followRedirects - boolean, optional setting to follow redirects. Default is false.

Field Summary

Fields inherited from class org.apache.solr.cloud.autoscaling.TriggerListenerBase

cloudManager, config, enabled, loader, requiredProperties, validProperties, validPropertyPrefixes

Constructor Summary

Constructors

Constructor and Description
HttpTriggerListener()

Method Summary

Modifier and Type	Method and Description
void	configure(SolrResourceLoader loader, SolrCloudManager cloudManager, AutoScalingConfig.TriggerListenerConfig config) Called when listener is created but before it's initialized and used.
void	onEvent(TriggerEvent event, TriggerEventProcessorStage stage, String actionName, ActionContext context, Throwable error, String message) This method is called when either a particular stage or actionName is reached during event processing.

Methods inherited from class org.apache.solr.cloud.autoscaling.TriggerListenerBase

close, getConfig, init, isEnabled

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

HttpTriggerListener

public HttpTriggerListener()

Method Detail

configure

public void configure(SolrResourceLoader loader,
                      SolrCloudManager cloudManager,
                      AutoScalingConfig.TriggerListenerConfig config)
               throws TriggerValidationException

Description copied from interface: TriggerListener

Called when listener is created but before it's initialized and used. This method should also verify that the configuration parameters are correct. It may be called multiple times.

Specified by:

configure in interface TriggerListener

Overrides:

configure in class TriggerListenerBase

Parameters:

loader - loader to use for instantiating sub-components

cloudManager - current instance of SolrCloudManager

config - coniguration

Throws:

TriggerValidationException - contains details of invalid configuration parameters.

onEvent

public void onEvent(TriggerEvent event,
                    TriggerEventProcessorStage stage,
                    String actionName,
                    ActionContext context,
                    Throwable error,
                    String message)

Description copied from interface: TriggerListener

This method is called when either a particular stage or actionName is reached during event processing.

Parameters:

event - current event being processed

stage - TriggerEventProcessorStage that this listener was registered for, or null

actionName - TriggerAction name that this listener was registered for, or null

context - optional ActionContext when the processing stage is related to an action, or null

error - optional Throwable error, or null

message - optional message