Splitting Json Array and groupping in to multiple messages camel - json

Question

I am using Jboss fuse 6.3 and apache camel 2.17.I wanted to split a huge json message in to multiple messages in camel spring dsl.
Sample message structure is below in this message i have 9 arrays of countries i need to split in to array of two as 5 messages the last message contains only one array.The order of messages doesn't matter.
Input message:
[{
"Cities": [{
"name": "Paris",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "Marseille",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Lyon",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Toulouse",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Nice",
"lat": "89.75",
"lng": "4.77"
}],
"country": "FR"
},
{
"Cities": [{
"name": "Berlin",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "Hamburg",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Munich",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Cologne",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Frankfurt",
"lat": "89.75",
"lng": "4.77"
}],
"country": "DE"
}, {
"Cities": [{
"name": "mumbai",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "Bangalore",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Delhi",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Chattisgarh",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Hyderabad",
"lat": "89.75",
"lng": "4.77"
}],
"country": "IN"
}, {
"Cities": [{
"name": "Aberdeen",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "Armagh",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Bangor",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Bath",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Belfast",
"lat": "89.75",
"lng": "4.77"
}],
"country": "UK"
}, {
"Cities": [{
"name": "Budapest",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "Debrecen",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Szeged",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Miskolc",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Pecs",
"lat": "89.75",
"lng": "4.77"
}],
"country": "HUNGARY"
}, {
"Cities": [{
"name": "Alingsas",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "Arboga",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Arvika",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Askersund",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Avesta",
"lat": "89.75",
"lng": "4.77"
}],
"country": "SWEDEN"
}, {
"Cities": [{
"name": "Amsterdam",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "Den Helder",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Edam",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Haarlem",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Purmerend",
"lat": "89.75",
"lng": "4.77"
}],
"country": "NETHERLANDS"
}, {
"Cities": [{
"name": "Abrantes",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "Agualva-Cacem",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Agueda",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Albufeira",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Alcacer do Sal",
"lat": "89.75",
"lng": "4.77"
}],
"country": "PORTUGAL"
}, {
"Cities": [{
"name": "Barcelona",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "madrid",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Saragossa",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Salamanca",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Granada",
"lat": "89.75",
"lng": "4.77"
}],
"country": "SPAIN"
}
]
Expected output:
First split:
[{
"Cities": [{
"name": "Paris",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "Marseille",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Lyon",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Toulouse",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Nice",
"lat": "89.75",
"lng": "4.77"
}],
"country": "FR"
},
{
"Cities": [{
"name": "Berlin",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "Hamburg",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Munich",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Cologne",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Frankfurt",
"lat": "89.75",
"lng": "4.77"
}],
"country": "DE"
}
]
Second split:
[{
"Cities": [{
"name": "mumbai",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "Bangalore",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Delhi",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Chattisgarh",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Hyderabad",
"lat": "89.75",
"lng": "4.77"
}],
"country": "IN"
},{
"Cities": [{
"name": "Aberdeen",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "Armagh",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Bangor",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Bath",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Belfast",
"lat": "89.75",
"lng": "4.77"
}],
"country": "UK"
}
]
.
.
.
Fifth split:
[{
"Cities": [{
"name": "Barcelona",
"lat": "45.75",
"lng": "4.583333"
}, {
"name": "madrid",
"lat": "45.97",
"lng": "4.54"
}, {
"name": "Saragossa",
"lat": "24.75",
"lng": "4.75"
}, {
"name": "Salamanca",
"lat": "37.75",
"lng": "4.755"
}, {
"name": "Granada",
"lat": "89.75",
"lng": "4.77"
}],
"country": "SPAIN"
}
]
I tried below referring Apache Camel with Json Array split from the post of Ricardo.But iam not sure how to configure aggregate(AggregationStrategies.groupedExchange()) in spring dsl.
Camel route:
<split streaming="true">
<jsonpath>$</jsonpath>
<aggregate completionTimeout="1000" completionSize="2" groupExchanges="true">
</aggregate>
<log message="${body}"></log>
</split>

Answer 1

Here's a simple example of how you could split your JSON array using Spring DSL:
<split>
<jsonpath>$</jsonpath>
<!-- Add rest of the logic here -->
</split>

Answer 2

The Spring DSL example from the mentioned question is this one:
<camel:route>
<camel:from uri="direct:start" />
<camel:split streaming="true">
<camel:jsonpath>$</camel:jsonpath>
<camel:aggregate completionSize="5"
completionTimeout="1000" groupExchanges="true">
<camel:correlationExpression>
<camel:constant>true</camel:constant>
</camel:correlationExpression>
<camel:log message="${body}"></camel:log>
<camel:to uri="mock:result"></camel:to>
</camel:aggregate>
</camel:split>
</camel:route>
There's a full implementation example here.
The groupExchange property just return a default aggregation strategy: GroupedExchangeAggregationStrategy.
You could implement your own and pass it as a bean parameter to your DSL like this:
<camel:route>
<camel:from uri="direct:start" />
<camel:split streaming="true">
<camel:jsonpath>$</camel:jsonpath>
<camel:aggregate strategyRef="stringConcatStrategy" completionSize="5"
completionTimeout="1000" >
<camel:correlationExpression>
<camel:constant>true</camel:constant>
</camel:correlationExpression>
<camel:log message="${body}"></camel:log>
<camel:to uri="mock:result"></camel:to>
</camel:aggregate>
</camel:split>
</camel:route>
Cheers!