Camel-Gora is an Apache Camel component that allows you to work with NoSQL databases using the Apache Gora framework.

Available as of Camel 2.14

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

Apache Gora Overview

The Apache Gora open source framework provides an in-memory data model and persistence for big data. Gora supports persisting to column stores, key value stores, document stores and RDBMSs, and analyzing the data with extensive Apache Hadoop™ MapReduce support. Gora uses the Apache Software License v2.0 and graduated from the Apache Incubator in Janauary 2012 to become a top-level Apache project.

Apache Gora currently supports the following datastores: Apache HBase, Apache Cassandra, Apache Accumulo, Amazon DynamoDB and SQL databases such as hsqldb, MySQL and more.

URI format

Hbase examples with mandatory options :

XML

Java DSL

Configuratiion

Using camel-gora needs some configuration. This mainly involve to configure the AvroStore through the gora.properties file and to define the relevant mappings as part of the gora-core module.

Extensive information for this configuration can be found in the apache gora documentation and the gora-conf page.

Supported Gora Operations

Supported operations include : put, get, delete, getSchemaName, deleteSchema, createSchema, query, deleteByQuery, schemaExists.

Some of the operations require arguments while some others no. The arguments to operations could be either the body of the in message or defined in a header property. Below there is a list with some additional info for each operation.

Property

Description

put

Inserts the persistent object with the given key.

get

Returns the object corresponding to the given key fetching all the fields.

delete

Deletes the object with the given key.

getSchemaName

Returns the schema name given to this DataStore.

deleteSchema

Deletes the underlying schema or table (or similar) in the datastore that holds the objects.

createSchema

Creates the optional schema or table (or similar) in the datastore to hold the objects.

query

Executes the given query and returns the results.

deleteByQuery

Deletes all the objects matching the query.

schemaExists

Returns whether the schema that holds the data exists in the datastore.

Options

Gora Headers

Property

Description

GoraOperation

Used in order to define the operation to execute.

GoraKey

Used in order to define the datum key for the operations need it.

Gora Configuration attributes

Property

Type

Description

keyClass

String

Key type. *

valueClass

String

Value type. *

dataStoreClass

String

DataStore type *

hadoopConfiguration

Configuration

Hadoop Configuration

concurrentConsumers

int

Concurrent Consumers (used only by consumers).

flushOnEveryOperation

boolean

Flush on every operation (used only by producers).

NOTE: the gora configuration properties marked with asterisk are mandatory

Gora Query attributes

Property

Type

Description

startTime

long

Start Time attribute.

endTime

long

End Time attribute.

timeRangeFrom

long

Time Range From attribute.

timeRangeTo

long

Time Range To attribute.

limit

long

Gora Query Limit attribute.

timestamp

long

Timestamp attribute.

startKey

Object

Start Key attribute.

endKey

Object

End Key attribute.

keyRangeFrom

Object

Key Range From attribute.

keyRangeTo

Object

Key Range To attribute.

fields

String

Fields attribute.

Usage examples

Create Schema (XML DSL):

SchemaExists (XML DSL):

Put (XML DSL):

Get (XML DSL):

Delete (XML DSL):

Query (XML DSL):

The full usage examples in the form of integration tests can be found at camel-gora-examples repository.

More resources

For more please information and in depth configuration refer to the Apache Gora Documentation and the Apache Gora Tutorial.

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