com.hp.util.persistence.cassandra.query

Class TransWriteQueryDecorator<T extends TransportObject<? super T,?>>

java.lang.Object

com.hp.util.persistence.cassandra.query.WriteQueryDecorator<T,DataStoreContext>

com.hp.util.persistence.cassandra.query.TransWriteQueryDecorator<T>

Type Parameters:

T - Type of the result of the query.

All Implemented Interfaces:

WriteQuery<T,DataStoreContext>

public class TransWriteQueryDecorator<T extends TransportObject<? super T,?>>
extends WriteQueryDecorator<T,DataStoreContext>

TransWriteQueryDecorator is a concrete decorator for the write query.
This decorator provides the ability to lock the rows that are being written to the persistence layer until the operation is finished.

This decorator assumes that the read all operation is not transaction based.

Author:

Nachiket Abhyankar

Constructor Summary

Constructors

Constructor and Description
TransWriteQueryDecorator(WriteQuery<T,DataStoreContext> update) Constructor for Write Query Decorator with locks.

Method Summary

Methods

Modifier and Type	Method and Description
T	execute(DataStoreContext context) This is the single execute method provided by the WriteQuery interface.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TransWriteQueryDecorator

public TransWriteQueryDecorator(WriteQuery<T,DataStoreContext> update)

Constructor for Write Query Decorator with locks. Logging is not provided here. If the query needs logging, it has to be decorated separately.

Parameters:

update - The write query to be executed. This can be an already decorated query.

Method Detail

execute

public T execute(DataStoreContext context)
                                               throws Exception

Description copied from interface: WriteQuery

This is the single execute method provided by the WriteQuery interface. The application/business logic prepares a write query and as the last step, calls this method to transmit data to the underlying tiers. This data is persisted using DAO and Entity Manager.

Parameters:

context - - The DataStore context. Provides the context to the query.

Returns:

Transport object that has been persisted/deleted.

Throws:

Exception