Corda Component

Both producer and consumer is supported

Since Camel 2.23

Camel connector for R3’s corda blockchain platform using corda-rpc library. This component uses the corda rpc client.

Maven users will need to add the following dependency to their pom.xml for this component:

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

URI Format

corda://<host:port>[?options]

Corda Options

The Corda component supports 14 options, which are listed below.

Name Description Default Type

configuration (common)

To use a shared configuration.

CordaConfiguration

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

pageSpecification (consumer)

PageSpecification allows specification of a page number (starting from 1) and page size (defaulting to 200 with a maximum page size of (Integer.MAX_INT) Note: we default the page number to 200 to enable queries without requiring a page specification but enabling detection of large results sets that fall out of the 200 requirement. Max page size should be used with extreme caution as results may exceed your JVM memory footprint.

200

PageSpecification

processSnapshot (consumer)

Whether to process snapshots or not

true

boolean

sort (consumer)

Sort allows specification of a set of entity attribute names and their associated directionality and null handling, to be applied upon processing a query specification. The value can be one of: ASC, DESC

Sort

contractStateClass (consumer)

A contract state (or just state) contains opaque data used by a contract program. It can be thought of as a disk file that the program can use to persist data across transactions. States are immutable: once created they are never updated, instead, any changes must generate a new successor state. States can be updated (consumed) only once: the notary is responsible for ensuring there is no double spending by only signing a transaction if the input states are all free.

Class

flowLogicArguments (consumer)

Start the given flow with the given arguments, returning an Observable with a single observation of the result of running the flow. The flowLogicClass must be annotated with net.corda.core.flows.StartableByRPC.

Object[]

flowLogicClass (consumer)

Start the given flow with the given arguments, returning an Observable with a single observation of the result of running the flow. The flowLogicClass must be annotated with net.corda.core.flows.StartableByRPC.

Class

queryCriteria (consumer)

QueryCriteria assumes underlying schema tables are correctly indexed for performance.

QueryCriteria

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

operation (producer)

Operation to use

String

basicPropertyBinding (advanced)

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

false

boolean

password (security)

Password for login

String

username (security)

Username for login

String

The Corda endpoint is configured using URI syntax:

corda:node

with the following path and query parameters:

Path Parameters (1 parameters):

Name Description Default Type

node

Required The url for the corda node

String

Query Parameters (16 parameters):

Name Description Default Type

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

pageSpecification (consumer)

PageSpecification allows specification of a page number (starting from 1) and page size (defaulting to 200 with a maximum page size of (Integer.MAX_INT) Note: we default the page number to 200 to enable queries without requiring a page specification but enabling detection of large results sets that fall out of the 200 requirement. Max page size should be used with extreme caution as results may exceed your JVM memory footprint.

200

PageSpecification

processSnapshot (consumer)

Whether to process snapshots or not

true

boolean

sort (consumer)

Sort allows specification of a set of entity attribute names and their associated directionality and null handling, to be applied upon processing a query specification. The value can be one of: ASC, DESC

Sort

contractStateClass (consumer)

A contract state (or just state) contains opaque data used by a contract program. It can be thought of as a disk file that the program can use to persist data across transactions. States are immutable: once created they are never updated, instead, any changes must generate a new successor state. States can be updated (consumed) only once: the notary is responsible for ensuring there is no double spending by only signing a transaction if the input states are all free.

Class

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. The value can be one of: InOnly, InOut, InOptionalOut

ExchangePattern

flowLogicArguments (consumer)

Start the given flow with the given arguments, returning an Observable with a single observation of the result of running the flow. The flowLogicClass must be annotated with net.corda.core.flows.StartableByRPC.

Object[]

flowLogicClass (consumer)

Start the given flow with the given arguments, returning an Observable with a single observation of the result of running the flow. The flowLogicClass must be annotated with net.corda.core.flows.StartableByRPC.

Class

queryCriteria (consumer)

QueryCriteria assumes underlying schema tables are correctly indexed for performance.

QueryCriteria

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

operation (producer)

Operation to use

String

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

password (security)

Password for login

String

username (security)

Username for login

String

You can append query options to the URI in the following format, ?options=value&option2=value&…​

Message Headers

Header Description

All URI options

All URI options can also be set as exchange headers.

Samples

Subscribe for new vault state changes:

from("corda://localhost:10006?username=user1&password=test&operation=VAULT_TRACK&contractStateClass=#contractStateClass")
    .to("jms:queue:vault");

Read the node information:

from("direct:start")
    .to("corda://localhost:10006?username=user1&password=test&operation=NODE_INFO");

Spring Boot Auto-Configuration

When using corda with 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-corda-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 15 options, which are listed below.

Name Description Default Type

camel.component.corda.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.corda.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.corda.configuration

To use a shared configuration. The option is a org.apache.camel.component.corda.CordaConfiguration type.

String

camel.component.corda.contract-state-class

A contract state (or just state) contains opaque data used by a contract program. It can be thought of as a disk file that the program can use to persist data across transactions. States are immutable: once created they are never updated, instead, any changes must generate a new successor state. States can be updated (consumed) only once: the notary is responsible for ensuring there is no double spending by only signing a transaction if the input states are all free.

Class

camel.component.corda.enabled

Whether to enable auto configuration of the corda component. This is enabled by default.

Boolean

camel.component.corda.flow-logic-arguments

Start the given flow with the given arguments, returning an Observable with a single observation of the result of running the flow. The flowLogicClass must be annotated with net.corda.core.flows.StartableByRPC.

Object[]

camel.component.corda.flow-logic-class

Start the given flow with the given arguments, returning an Observable with a single observation of the result of running the flow. The flowLogicClass must be annotated with net.corda.core.flows.StartableByRPC.

Class

camel.component.corda.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

camel.component.corda.operation

Operation to use

String

camel.component.corda.page-specification

PageSpecification allows specification of a page number (starting from 1) and page size (defaulting to 200 with a maximum page size of (Integer.MAX_INT) Note: we default the page number to 200 to enable queries without requiring a page specification but enabling detection of large results sets that fall out of the 200 requirement. Max page size should be used with extreme caution as results may exceed your JVM memory footprint. The option is a net.corda.core.node.services.vault.PageSpecification type.

String

camel.component.corda.password

Password for login

String

camel.component.corda.process-snapshot

Whether to process snapshots or not

true

Boolean

camel.component.corda.query-criteria

QueryCriteria assumes underlying schema tables are correctly indexed for performance. The option is a net.corda.core.node.services.vault.QueryCriteria type.

String

camel.component.corda.sort

Sort allows specification of a set of entity attribute names and their associated directionality and null handling, to be applied upon processing a query specification.

Sort

camel.component.corda.username

Username for login

String