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Chapter 81. Krati

Krati Component
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Available as of Camel 2.9
This component allows the use krati datastores and datasets inside Camel. Krati is a simple persistent data store with very low latency and high throughput. It is designed for easy integration with read-write-intensive applications with little effort in tuning configuration, performance and JVM garbage collection.
Camel provides a producer and consumer for krati datastore_(key/value engine)_. It also provides an idempotent repository for filtering out duplicate messages.
Maven users will need to add the following dependency to their pom.xml for this component: 
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-krati</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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krati:[the path of the datastore][?options]
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The path of the datastore is the relative path of the folder that krati will use for its datastore.
You can append query options to the URI in the following format, ?option=value&option=value&...

Krati URI Options
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Expand
Name Default Value Description
operation CamelKratiPut Producer Only. Specifies the type of operation that will be performed to the datastore. Allowed values are CamelKratiPut, CamelKratiGet, CamelKratiDelete & CamelKratiDeleteAll.
initialCapacity 100 The inital capcity of the store.
keySerializer KratiDefaultSerializer The serializer serializer that will be used to serialize the key.
valueSerializer KratiDefaultSerializer The serializer serializer that will be used to serialize the value.
segmentFactory ChannelSegmentFactory The segment factory to use. Allowed instance classes: ChannelSegmentFactory,MemorySegmentFactory, MappedSegmentFactory & WriteBufferSegmentFactory.
hashFunction FnvHashFunction The hash function to use. Allowed instance classes: FnvHashFunction,Fnv1Hash32,FnvHash64,Fnv1aHash32,Fnv1aHash64, JenkisHashFunction, MurmurHashFunctiom
maxMessagesPerPoll Camel 2.10.5/2.11.1: The maximum number of messages which can be received in one poll. This can be used to avoid reading in too much data and taking up too much memory.
For producer endpoint you can override all of the above URI options by passing the appropriate headers to the message.

Message Headers for datastore
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Header Description
CamelKratiOperation
The operation to be performed on the datastore. The valid options are
  • CamelKratiAdd
  • CamelKratiGet
  • CamelKratiDelete
  • CamelKratiDeleteAll
CamelKratiKey The key.
CamelKratiValue The value.

Usage Samples
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Example 1: Putting to the datastore.
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This example will show you how you can store any message inside a datastore. 
from("direct:put").to("krati:target/test/producertest");
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In the above example you can override any of the URI parameters with headers on the message. Here is how the above example would look like using xml to define our route. 
        <route>
            <from uri="direct:put"/>
            <to uri="krati:target/test/producerspringtest"/>
        </route>
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Example 2: Getting/Reading from a datastore
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This example will show you how you can read the contnet of a datastore. 
from("direct:get")
    .setHeader(KratiConstants.KRATI_OPERATION, constant(KratiConstants.KRATI_OPERATION_GET))
    .to("krati:target/test/producertest");
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In the above example you can override any of the URI parameters with headers on the message. Here is how the above example would look like using xml to define our route. 
<route>
     <from uri="direct:get"/>
     <to uri="krati:target/test/producerspringtest?operation=CamelKratiGet"/>
</route>
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Example 3: Consuming from a datastore
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This example will consume all items that are under the specified datastore. 
    from("krati:target/test/consumertest")
        .to("direct:next");
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You can achieve the same goal by using xml, as you can see below. 
<route>
    <from uri="krati:target/test/consumerspringtest"/>
    <to uri="mock:results"/>
</route>
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Idempotent Repository
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As already mentioned this component also offers and idemptonet repository which can be used for filtering out duplicate messages. 
from("direct://in").idempotentConsumer(header("messageId"), new KratiIdempotentRepositroy("/tmp/idempotent").to("log://out");
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See also
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