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- As a consumer, monitors couch changesets for inserts, updates and deletes and publishes these as messages into camel routes.
- As a producer, can save or update documents , update and from Camel 2.18 delete (by using CouchDbMethod with DELETE value) documents into couch.
- Can support as many endpoints as required, eg for multiple databases across multiple instances.
- Ability to have events trigger for only deletes, only inserts/updates or all (default).
- Headers set for sequenceId, document revision, document id, and HTTP method type.
Maven users will need to add the following dependency to their pom.xml
for this component:
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<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-couchdb</artifactId>
<version>x.x.x</version>
<!-- use the same version as your Camel core version -->
</dependency>
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URI format
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couchdb:http://hostname[:port]/database?[options]
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Where hostname is the hostname of the running couchdb instance. Port is optional and if not specified then defaults to 5984.
Options
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Property | Default | Description |
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deletes
| true
| document deletes are published as events | updates
| true
| document inserts/updates are published as events | heartbeat
| 30000
| how often to send an empty message to keep socket alive in millis | createDatabase
| true
| create the database if it does not already exist | username
| null
| username in case of authenticated databases | password
| null
| password for authenticated databases |
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{div:class=confluenceTableSmall}
|| Property || Default || Description ||
| {{deletes}} | {{true}} | document deletes are published as events |
| {{updates}} | {{true}} | document inserts/updates are published as events |
| {{heartbeat}} | {{30000}} | how often to send an empty message to keep socket alive in millis |
| {{createDatabase}} | {{true}} | create the database if it does not already exist |
| {{username}} | {{null}} | username in case of authenticated databases |
| {{password}} | {{null}} | password for authenticated databases |
{div} |
The following headers are set on exchanges during message transport.
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Property | Value |
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CouchDbDatabase
| the database the message came from | CouchDbSeq
| the couchdb changeset sequence number of the update / delete message | CouchDbId
| the couchdb document id | CouchDbRev
| the couchdb document revision | CouchDbMethod
| the method (delete / update) |
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{div:class=confluenceTableSmall}
|| Property || Value ||
| {{CouchDbDatabase}} | the database the message came from |
| {{CouchDbSeq}} | the couchdb changeset sequence number of the update / delete message |
| {{CouchDbId}} | the couchdb document id |
| {{CouchDbRev}} | the couchdb document revision |
| {{CouchDbMethod}} | the method (delete / update) |
{div} |
Headers are set by the consumer once the message is received. The producer will also set the headers for downstream processors once the insert/update has taken place. Any headers set prior to the producer are ignored. That means for example, if you set CouchDbId as a header, it will not be used as the id for insertion, the id of the document will still be used.
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For example if you wish to consume all inserts, updates and deletes from a CouchDB instance running locally, on port 9999 then you could use the following:
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from("couchdb:http://localhost:9999").process(someProcessor);
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If you were only interested in deletes, then you could use the following
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from("couchdb:http://localhost:9999?updates=false").process(someProcessor);
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If you wanted to insert a message as a document, then the body of the exchange is used
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from("someProducingEndpoint").process(someProcessor).to("couchdb:http://localhost:9999")
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