Ignite Compute

Since Camel 2.17

Only producer is supported

The Ignite Compute endpoint is one of camel-ignite endpoints which allows you to run compute operations on the cluster by passing in an IgniteCallable, an IgniteRunnable, an IgniteClosure, or collections of them, along with their parameters if necessary.

The host part of the endpoint URI is a symbolic endpoint ID, it is not used for any purposes.

The endpoint tries to run the object passed in the body of the IN message as the compute job. It expects different payload types depending on the execution type.

Configuring Options

Camel components are configured on two separate levels:

  • component level

  • endpoint level

Configuring Component Options

The component level is the highest level which holds general and common configurations that are inherited by the endpoints. For example a component may have security settings, credentials for authentication, urls for network connection and so forth.

Some components only have a few options, and others may have many. Because components typically have pre configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all.

Configuring components can be done with the Component DSL, in a configuration file (application.properties|yaml), or directly with Java code.

Configuring Endpoint Options

Where you find yourself configuring the most is on endpoints, as endpoints often have many options, which allows you to configure what you need the endpoint to do. The options are also categorized into whether the endpoint is used as consumer (from) or as a producer (to), or used for both.

Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL and DataFormat DSL as a type safe way of configuring endpoints and data formats in Java.

A good practice when configuring options is to use Property Placeholders, which allows to not hardcode urls, port numbers, sensitive information, and other settings. In other words placeholders allows to externalize the configuration from your code, and gives more flexibility and reuse.

The following two sections lists all the options, firstly for the component followed by the endpoint.

Component Options

The Ignite Compute component supports 5 options, which are listed below.

Name Description Default Type

configurationResource (producer)

The resource from where to load the configuration. It can be a: URL, String or InputStream type.

Object

ignite (producer)

To use an existing Ignite instance.

Ignite

igniteConfiguration (producer)

Allows the user to set a programmatic ignite configuration.

IgniteConfiguration

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

boolean

Endpoint Options

The Ignite Compute endpoint is configured using URI syntax:

ignite-compute:endpointId

with the following path and query parameters:

Path Parameters (1 parameters)

Name Description Default Type

endpointId (producer)

Required The endpoint ID (not used).

String

Query Parameters (8 parameters)

Name Description Default Type

clusterGroupExpression (producer)

An expression that returns the Cluster Group for the IgniteCompute instance.

ClusterGroupExpression

computeName (producer)

The name of the compute job, which will be set via IgniteCompute#withName(String).

String

executionType (producer)

Required The compute operation to perform. Possible values: CALL, BROADCAST, APPLY, EXECUTE, RUN, AFFINITY_CALL, AFFINITY_RUN. The component expects different payload types depending on the operation.

Enum values:

  • CALL

  • BROADCAST

  • APPLY

  • EXECUTE

  • RUN

  • AFFINITY_CALL

  • AFFINITY_RUN

IgniteComputeExecutionType

propagateIncomingBodyIfNoReturnValue (producer)

Sets whether to propagate the incoming body if the return type of the underlying Ignite operation is void.

true

boolean

taskName (producer)

The task name, only applicable if using the IgniteComputeExecutionType#EXECUTE execution type.

String

timeoutMillis (producer)

The timeout interval for triggered jobs, in milliseconds, which will be set via IgniteCompute#withTimeout(long).

Long

treatCollectionsAsCacheObjects (producer)

Sets whether to treat Collections as cache objects or as Collections of items to insert/update/compute, etc.

false

boolean

lazyStartProducer (producer (advanced))

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

Message Headers

The Ignite Compute component supports 5 message header(s), which is/are listed below:

Name Description Default Type

CamelIgniteComputeExecutionType (producer)

Constant: IGNITE_COMPUTE_EXECUTION_TYPE

Allows you to dynamically change the compute operation to perform.

Enum values:

  • CALL

  • BROADCAST

  • APPLY

  • EXECUTE

  • RUN

  • AFFINITY_CALL

  • AFFINITY_RUN

IgniteComputeExecutionType

CamelIgniteComputeParameters (producer)

Constant: IGNITE_COMPUTE_PARAMS

Parameters for APPLY, BROADCAST and EXECUTE operations.

Any object or Collection of objects

CamelIgniteComputeReducer (producer)

Constant: IGNITE_COMPUTE_REDUCER

Reducer for the APPLY and CALL operations.

IgniteReducer

CamelIgniteComputeAffinityCacheName (producer)

Constant: IGNITE_COMPUTE_AFFINITY_CACHE_NAME

Affinity cache name for the AFFINITY_CALL and AFFINITY_RUN operations.

String

CamelIgniteComputeAffinityKey (producer)

Constant: IGNITE_COMPUTE_AFFINITY_KEY

Affinity key for the AFFINITY_CALL and AFFINITY_RUN operations.

Object

Expected payload types

Each operation expects the indicated types:

Operation Expected payloads

CALL

Collection of IgniteCallable, or a single IgniteCallable.

BROADCAST

IgniteCallable, IgniteRunnable, IgniteClosure.

APPLY

IgniteClosure.

EXECUTE

ComputeTask, Class<? extends ComputeTask> or an object representing parameters if the taskName option is not null.

RUN

A Collection of IgniteRunnables, or a single IgniteRunnable.

AFFINITY_CALL

IgniteCallable.

AFFINITY_RUN

IgniteRunnable.