Hazelcast Queue Component

Since Camel 2.7

Both producer and consumer is supported

The Hazelcast Queue component is one of Camel Hazelcast Components which allows you to access Hazelcast distributed queue.

Options

The Hazelcast Queue component supports 5 options, which are listed below.

Name Description Default Type

hazelcastInstance (advanced)

The hazelcast instance reference which can be used for hazelcast endpoint. If you don’t specify the instance reference, camel use the default hazelcast instance from the camel-hazelcast instance.

HazelcastInstance

hazelcastMode (advanced)

The hazelcast mode reference which kind of instance should be used. If you don’t specify the mode, then the node mode will be the default.

node

String

basicPropertyBinding (advanced)

Whether the component should use basic property binding (Camel 2.x) or the newer property binding with additional capabilities

false

boolean

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

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

The Hazelcast Queue endpoint is configured using URI syntax:

hazelcast-queue:cacheName

with the following path and query parameters:

Path Parameters (1 parameters):

Name Description Default Type

cacheName

Required The name of the cache

String

Query Parameters (12 parameters):

Name Description Default Type

defaultOperation (common)

To specify a default operation to use, if no operation header has been provided.

HazelcastOperation

hazelcastInstance (common)

The hazelcast instance reference which can be used for hazelcast endpoint.

HazelcastInstance

hazelcastInstanceName (common)

The hazelcast instance reference name which can be used for hazelcast endpoint. If you don’t specify the instance reference, camel use the default hazelcast instance from the camel-hazelcast instance.

String

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

pollingTimeout (consumer)

Define the polling timeout of the Queue consumer in Poll mode

10000

long

poolSize (consumer)

Define the Pool size for Queue Consumer Executor

1

int

queueConsumerMode (consumer)

Define the Queue Consumer mode: Listen or Poll

Listen

HazelcastQueueConsumerMode

exceptionHandler (consumer)

To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored.

ExceptionHandler

exchangePattern (consumer)

Sets the exchange pattern when the consumer creates an exchange.

ExchangePattern

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

basicPropertyBinding (advanced)

Whether the endpoint should use basic property binding (Camel 2.x) or the newer property binding with additional capabilities

false

boolean

synchronous (advanced)

Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported).

false

boolean

Spring Boot Auto-Configuration

When using Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-hazelcast-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 8 options, which are listed below.

Name Description Default Type

camel.component.hazelcast-queue.basic-property-binding

Whether the component should use basic property binding (Camel 2.x) or the newer property binding with additional capabilities

false

Boolean

camel.component.hazelcast-queue.bridge-error-handler

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

Boolean

camel.component.hazelcast-queue.customizer.hazelcast-instance.enabled

Enable or disable the cache-manager customizer.

true

Boolean

camel.component.hazelcast-queue.customizer.hazelcast-instance.override

Configure if the cache manager eventually set on the component should be overridden by the customizer.

false

Boolean

camel.component.hazelcast-queue.enabled

Enable hazelcast-queue component

true

Boolean

camel.component.hazelcast-queue.hazelcast-instance

The hazelcast instance reference which can be used for hazelcast endpoint. If you don’t specify the instance reference, camel use the default hazelcast instance from the camel-hazelcast instance. The option is a com.hazelcast.core.HazelcastInstance type.

String

camel.component.hazelcast-queue.hazelcast-mode

The hazelcast mode reference which kind of instance should be used. If you don’t specify the mode, then the node mode will be the default.

node

String

camel.component.hazelcast-queue.lazy-start-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

Queue producer – to(“hazelcast-queue:foo”)

The queue producer provides 10 operations: * add * put * poll * peek * offer * remove value * remaining capacity * remove all * remove if * drain to * take * retain all

Sample for add:

from("direct:add")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.ADD))
.toF("hazelcast-%sbar", HazelcastConstants.QUEUE_PREFIX);

Sample for put:

from("direct:put")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.PUT))
.toF("hazelcast-%sbar", HazelcastConstants.QUEUE_PREFIX);

Sample for poll:

from("direct:poll")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.POLL))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);

Sample for peek:

from("direct:peek")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.PEEK))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);

Sample for offer:

from("direct:offer")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.OFFER))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);

Sample for removevalue:

from("direct:removevalue")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.REMOVE_VALUE))
.toF("hazelcast-%sbar", HazelcastConstants.QUEUE_PREFIX);

Sample for remaining capacity:

from("direct:remaining-capacity").setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.REMAINING_CAPACITY)).to(
String.format("hazelcast-%sbar", HazelcastConstants.QUEUE_PREFIX));

Sample for remove all:

from("direct:removeAll").setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.REMOVE_ALL)).to(
String.format("hazelcast-%sbar", HazelcastConstants.QUEUE_PREFIX));

Sample for remove if:

from("direct:removeIf").setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.REMOVE_IF)).to(
String.format("hazelcast-%sbar", HazelcastConstants.QUEUE_PREFIX));

Sample for drain to:

from("direct:drainTo").setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.DRAIN_TO)).to(
String.format("hazelcast-%sbar", HazelcastConstants.QUEUE_PREFIX));

Sample for take:

from("direct:take").setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.TAKE)).to(
String.format("hazelcast-%sbar", HazelcastConstants.QUEUE_PREFIX));

Sample for retain all:

from("direct:retainAll").setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.RETAIN_ALL)).to(
String.format("hazelcast-%sbar", HazelcastConstants.QUEUE_PREFIX));

Queue consumer – from(“hazelcast-queue:foo”)

The queue consumer provides two different modes:

  • Poll

  • Listen

Sample for Poll mode

fromF("hazelcast-%sfoo?queueConsumerMode=Poll", HazelcastConstants.QUEUE_PREFIX)).to("mock:result");

In this way the consumer will poll the queue and return the head of the queue or null after a timeout.

In Listen mode instead the consumer will listen for events on queue.

The queue consumer in Listen mode provides 2 operations: * add * remove

Sample for Listen mode

fromF("hazelcast-%smm", HazelcastConstants.QUEUE_PREFIX)
   .log("object...")
   .choice()
    .when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.ADDED))
            .log("...added")
        .to("mock:added")
    .when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.REMOVED))
        .log("...removed")
        .to("mock:removed")
    .otherwise()
        .log("fail!");