Yammer Component

Since Camel 2.12

Both producer and consumer is supported

The Yammer component allows you to interact with the Yammer enterprise social network. Consuming messages and users is supported as well as creating new messages.

Yammer uses OAuth 2 for all client application authentication. In order to use camel-yammer with your account, you’ll need to create a new application within Yammer and grant the application access to your account. Finally, generate your access token. More details are at https://developer.yammer.com/authentication/.

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

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-yammer</artifactId>
    <version>${camel-version}</version>
</dependency>

URI format

yammer:[function]?[options]

Component options

The Yammer component can be configured with the Yammer account settings which are mandatory to configure before using.

The Yammer component supports 7 options, which are listed below.

Name Description Default Type

consumerKey (security)

The consumer key

String

consumerSecret (security)

The consumer secret

String

accessToken (security)

The access token

String

config (advanced)

To use a shared yammer configuration

YammerConfiguration

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

You can also configure these options directly in the endpoint.

Endpoint options

The Yammer endpoint is configured using URI syntax:

yammer:function

with the following path and query parameters:

Path Parameters (1 parameters):

Name Description Default Type

function

Required The function to use

YammerFunctionType

Query Parameters (31 parameters):

Name Description Default Type

useJson (common)

Set to true if you want to use raw JSON rather than converting to POJOs.

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

delay (consumer)

Delay between polling in millis

5000

long

limit (consumer)

Return only the specified number of messages. Works for threaded=true and threaded=extended.

-1

int

newerThan (consumer)

Returns messages newer than the message ID specified as a numeric string. This should be used when polling for new messages. If you’re looking at messages, and the most recent message returned is 3516, you can make a request with the parameter newerThan=3516 to ensure that you do not get duplicate copies of messages already on your page.

-1

long

olderThan (consumer)

Returns messages older than the message ID specified as a numeric string. This is useful for paginating messages. For example, if you’re currently viewing 20 messages and the oldest is number 2912, you could append olderThan=2912 to your request to get the 20 messages prior to those you’re seeing.

-1

long

sendEmptyMessageWhenIdle (consumer)

If the polling consumer did not poll any files, you can enable this option to send an empty message (no body) instead.

false

boolean

threaded (consumer)

threaded=true will only return the first message in each thread. This parameter is intended for apps which display message threads collapsed. threaded=extended will return the thread starter messages in order of most recently active as well as the two most recent messages, as they are viewed in the default view on the Yammer web interface.

String

userId (consumer)

The user id

String

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

pollStrategy (consumer)

A pluggable org.apache.camel.PollingConsumerPollingStrategy allowing you to provide your custom implementation to control error handling usually occurred during the poll operation before an Exchange have been created and being routed in Camel.

PollingConsumerPollStrategy

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

backoffErrorThreshold (scheduler)

The number of subsequent error polls (failed due some error) that should happen before the backoffMultipler should kick-in.

int

backoffIdleThreshold (scheduler)

The number of subsequent idle polls that should happen before the backoffMultipler should kick-in.

int

backoffMultiplier (scheduler)

To let the scheduled polling consumer backoff if there has been a number of subsequent idles/errors in a row. The multiplier is then the number of polls that will be skipped before the next actual attempt is happening again. When this option is in use then backoffIdleThreshold and/or backoffErrorThreshold must also be configured.

int

greedy (scheduler)

If greedy is enabled, then the ScheduledPollConsumer will run immediately again, if the previous run polled 1 or more messages.

false

boolean

initialDelay (scheduler)

Milliseconds before the first poll starts. You can also specify time values using units, such as 60s (60 seconds), 5m30s (5 minutes and 30 seconds), and 1h (1 hour).

1000

long

repeatCount (scheduler)

Specifies a maximum limit of number of fires. So if you set it to 1, the scheduler will only fire once. If you set it to 5, it will only fire five times. A value of zero or negative means fire forever.

0

long

runLoggingLevel (scheduler)

The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that.

TRACE

LoggingLevel

scheduledExecutorService (scheduler)

Allows for configuring a custom/shared thread pool to use for the consumer. By default each consumer has its own single threaded thread pool.

ScheduledExecutorService

scheduler (scheduler)

To use a cron scheduler from either camel-spring or camel-quartz component

none

String

schedulerProperties (scheduler)

To configure additional properties when using a custom scheduler or any of the Quartz, Spring based scheduler.

Map

startScheduler (scheduler)

Whether the scheduler should be auto started.

true

boolean

timeUnit (scheduler)

Time unit for initialDelay and delay options.

MILLISECONDS

TimeUnit

useFixedDelay (scheduler)

Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details.

true

boolean

accessToken (security)

Required The access token

String

consumerKey (security)

Required The consumer key

String

consumerSecret (security)

Required The consumer secret

String

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-yammer-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 20 options, which are listed below.

Name Description Default Type

camel.component.yammer.access-token

The access token

String

camel.component.yammer.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.yammer.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.yammer.config.access-token

The access token

String

camel.component.yammer.config.consumer-key

The consumer key

String

camel.component.yammer.config.consumer-secret

The consumer secret

String

camel.component.yammer.config.delay

Delay between polling in millis

5000

Long

camel.component.yammer.config.function

The function to use

String

camel.component.yammer.config.function-type

The function to use

YammerFunctionType

camel.component.yammer.config.limit

Return only the specified number of messages. Works for threaded=true and threaded=extended.

-1

Integer

camel.component.yammer.config.newer-than

Returns messages newer than the message ID specified as a numeric string. This should be used when polling for new messages. If you’re looking at messages, and the most recent message returned is 3516, you can make a request with the parameter "?newerThan=3516″ to ensure that you do not get duplicate copies of messages already on your page.

-1

Long

camel.component.yammer.config.older-than

Returns messages older than the message ID specified as a numeric string. This is useful for paginating messages. For example, if you’re currently viewing 20 messages and the oldest is number 2912, you could append "?olderThan=2912″ to your request to get the 20 messages prior to those you’re seeing.

-1

Long

camel.component.yammer.config.requestor

Set to true if you want to use raw JSON rather than converting to POJOs.

ApiRequestor

camel.component.yammer.config.threaded

threaded=true will only return the first message in each thread. This parameter is intended for apps which display message threads collapsed. threaded=extended will return the thread starter messages in order of most recently active as well as the two most recent messages, as they are viewed in the default view on the Yammer web interface.

String

camel.component.yammer.config.use-json

Set to true if you want to use raw JSON rather than converting to POJOs.

false

Boolean

camel.component.yammer.config.user-id

The user id

String

camel.component.yammer.consumer-key

The consumer key

String

camel.component.yammer.consumer-secret

The consumer secret

String

camel.component.yammer.enabled

Enable yammer component

true

Boolean

camel.component.yammer.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

Consuming messages

The Yammer component provides several endpoints for consuming messages:

URI Description
 yammer:messages?[options]

All public messages in the user’s (whose access token is being used to make the API call) Yammer network. Corresponds to "All" conversations in the Yammer web interface.

 yammer:my_feed?[options]

The user’s feed, based on the selection they have made between "Following" and "Top" conversations.

yammer:algo?[options]

The algorithmic feed for the user that corresponds to "Top" conversations, which is what the vast majority of users will see in the Yammer web interface.

yammer:following?[options]

The "Following" feed which is conversations involving people, groups and topics that the user is following.

yammer:sent?[options]

All messages sent by the user.

yammer:private?[options]

Private messages received by the user.

yammer:received?[options]

All messages received by the user

Message format

All messages by default are converted to a POJO model provided in the org.apache.camel.component.yammer.model package. The original message coming from yammer is in JSON. For all message consuming and producing endpoints, a Messages object is returned. Take for example a route like:

from("yammer:messages?consumerKey=aConsumerKey&consumerSecret=aConsumerSecretKey&accessToken=aAccessToken")
    .to("mock:result");

and lets say the yammer server returns:

{
    "messages":[
        {
            "replied_to_id":null,
            "network_id":7654,
            "url":"https://www.yammer.com/api/v1/messages/305298242",
            "thread_id":305298242,
            "id":305298242,
            "message_type":"update",
            "chat_client_sequence":null,
            "body":{
                "parsed":"Testing yammer API...",
                "plain":"Testing yammer API...",
                "rich":"Testing yammer API..."
            },
            "client_url":"https://www.yammer.com/",
            "content_excerpt":"Testing yammer API...",
            "created_at":"2013/06/25 18:14:45 +0000",
            "client_type":"Web",
            "privacy":"public",
            "sender_type":"user",
            "liked_by":{
                "count":1,
                "names":[
                    {
                        "permalink":"janstey",
                        "full_name":"Jonathan Anstey",
                        "user_id":1499642294
                    }

                ]

            },
            "sender_id":1499642294,
            "language":null,
            "system_message":false,
            "attachments":[

            ],
            "direct_message":false,
            "web_url":"https://www.yammer.com/redhat.com/messages/305298242"
        },
        {
            "replied_to_id":null,
            "network_id":7654,
            "url":"https://www.yammer.com/api/v1/messages/294326302",
            "thread_id":294326302,
            "id":294326302,
            "message_type":"system",
            "chat_client_sequence":null,
            "body":{
                "parsed":"(Principal Software Engineer) has [[tag:14658]] the redhat.com network. Take a moment to welcome Jonathan.",
                "plain":"(Principal Software Engineer) has #joined the redhat.com network. Take a moment to welcome Jonathan.",
                "rich":"(Principal Software Engineer) has #joined the redhat.com network. Take a moment to welcome Jonathan."
            },
            "client_url":"https://www.yammer.com/",
            "content_excerpt":"(Principal Software Engineer) has #joined the redhat.com network. Take a moment to welcome Jonathan.",
            "created_at":"2013/05/10 19:08:29 +0000",
            "client_type":"Web",
            "sender_type":"user",
            "privacy":"public",
            "liked_by":{
                "count":0,
                "names":[

                ]

            }
        }
        ]

    }

Camel will marshal that into a Messages object containing 2 Message objects. As shown below there is a rich object model that makes it easy to get any information you need:

Exchange exchange = mock.getExchanges().get(0);
Messages messages = exchange.getIn().getBody(Messages.class);

assertEquals(2, messages.getMessages().size());
assertEquals("Testing yammer API...", messages.getMessages().get(0).getBody().getPlain());
assertEquals("(Principal Software Engineer) has #joined the redhat.com network. Take a moment to welcome Jonathan.", messages.getMessages().get(1).getBody().getPlain());

That said, marshaling this data into POJOs is not free so if you need you can switch back to using pure JSON by adding the useJson=false option to your URI.

Creating messages

To create a new message in the account of the current user, you can use the following URI:

yammer:messages?[options]

The current Camel message body is what will be used to set the text of the Yammer message. The response body will include the new message formatted the same way as when you consume messages (i.e. as a Messages object by default).

Take this route for instance:

from("direct:start")
    .to("yammer:messages?consumerKey=aConsumerKey&consumerSecret=aConsumerSecretKey&accessToken=aAccessToken")
    .to("mock:result");

By sending to the direct:start endpoint a "Hi from Camel!" message body:

template.sendBody("direct:start", "Hi from Camel!");

a new message will be created in the current user’s account on the server and also this new message will be returned to Camel and converted into a Messages object. Like when consuming messages you can interrogate the Messages object:

Exchange exchange = mock.getExchanges().get(0);
Messages messages = exchange.getIn().getBody(Messages.class);

assertEquals(1, messages.getMessages().size());
assertEquals("Hi from Camel!", messages.getMessages().get(0).getBody().getPlain());

Retrieving users

The Yammer component provides several endpoints for retrieving users:

URI Description
yammer:users?[options]

Retrieve users in the current user’s Yammer network.

yammer:current?[options]

View data about the current user.

Using an enricher

It is helpful sometimes (or maybe always in the case of users to use an enricher pattern rather than a route initiated with one of the polling consumers in camel-yammer. This is because the consumers will fire repeatedly, however often you set the delay for. If you just want to look up a user’s data, or grab a message at a point in time, it is better to call that consumer once and then get one with your route.

Lets say you have a route that at some point needs to go out and fetch user data for the current user. Rather than polling for this user over and over again, use the pollEnrich DSL method:

from("direct:start")
    .pollEnrich("yammer:current?consumerKey=aConsumerKey&consumerSecret=aConsumerSecretKey&accessToken=aAccessToken")
    .to("mock:result");

This will go out and fetch the current user’s User object and set it as the Camel message body.