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// Optionally: override default store from context
// (ohr:) IMHO I don't think that this configuration level is really necessary
defaultMessageStore(myStore);

// 1) Store body.
// 2) Set body to null.
// 3) Set Exchange.CLAIM_CHECK header to unique claim id.
from(...)
   .checkincheckIn()  // store body in default store
   // .checkincheckIn(header('bigHeader'), customStore) : store header in custom store 
   .to(...);

// 1) Lookup for the Exchange.CLAIM_CHECK header value.
// 2) Read the message.
// 3) Set body to the value fetched from the store.
from(...)
   // .setHeader(Exchange.CLAIM_CHECK, const("id")) : header should still contain the claim id 
   .claimreclaim() // read body from default store
   // .reclaim().aggregationStrategy(myStrategy) : more generically using a aggregation strategy
   // .reclaim(customStore).aggregationStrategy(myStrategy) : reclaim from custom store using a aggregation strategy
   .to(...);