Document Store Framework

Document Store Lib Provides facilities to store document in a Document Store NoSQL DB. It provides Aggregation, Bufferization and Fallback capabilities.

Library

The library has been tough to provide a common way to store Records in Document Store NoSQL DB. In particular is responsible for:

• Buffering
• Aggregating
• Storing

The library is designed to separate the above mentioned capabilities from the logic needed to really store the Records on DB.

Buffering & Aggregating Record

The library provide buffering capabilities. For each new request to store a record the library try to aggregate the received record with the ones has already buffered. The aggregation made in this phase is lossless. In other words, the Record aggregated are only the ones having for all properties the same values except the ones where the aggregation has been made (e.g. operationCount).

Storing Record

The library discover dynamically the Document Store Lib Persistence. This library is responsible to connect to DS-NoSQL DB and to really store the Record. The configuration parameters are also discovered dynamically.

If no library is discovered or if the storing fails (e.g. for network issue) the Records are persisted using a Fallback Persistence (on filesystem). Please note that Fallback Persistence is also used when a failure occurs (e.g. a network failure).

A recurrent task periodically (actually 10 min) check if there are Records stored from Fallback Persistence (A Document Store Lib Persistence must be discovered in advance to activate the recurrent task because otherwise the task has no reason to exist).

Base Model

To set the various properties of a records two different methods are available by setting

• Each Single Property through a generic Key-Value method
  • key : String
  • value : ? extends Serializable
• Multiple Properties at once passing a Map<String,? extends Serializable>.

The build blocks of this library are the interfaces:

• Record
• AggregatedRecord

The first interface (Record) must be implemented to create a class compliant with the library model, so that the library can provide it own facilities. The second interface must be implemented if the model needs the aggregation facilities.

The library provides also a basic implementation AbstractRecord that the developer can use as building block fro its own model. By extending this abstract class the library also provide properties:

• Validations
• Harmonizations

Development

The library is identified by the following maven coordinates:

<groupId>org.gcube.data-publishing</groupId>

<artifactId>document-store-lib</artifactId>

Please set the scope of the library to PROVIDED, if your component runs on a container gHN or vHN.

Document Store Lib Persistence

The current implementations of persistence for this library are:

• couchdb

<groupId>org.gcube.data-publishing</groupId>

<artifactId>document-store-lib-couchdb</artifactId>

• couchbase

<groupId>org.gcube.data-publishing</groupId>

<artifactId>document-store-lib-couchbase</artifactId>

• mongodb

<groupId>org.gcube.data-publishing</groupId>

<artifactId>document-store-lib-mongodb</artifactId>

The developer MUST not depend from this libraries.

Deployment

Document Store Lib and the Document Store Lib CouchDB are already available on gCore and smartgears bundles (gHN and wHN).

Document Store Lib in the Accounting Architecture

The following image evidences the use of Document Store Lib in Accounting Architecture: