Package org.trellisldp.ext.cassandra.query

Class CassandraQuery

java.lang.Object

org.trellisldp.ext.cassandra.query.CassandraQuery

Direct Known Subclasses:

BasicContainment, BinaryQuery, Delete, Get, GetFirstMemento, GetMemento, ImmutableInsert, ImmutableRetrieve, Mementoize, Mementos, MutableInsert, Touch

public class CassandraQuery
extends Object

A context for queries run against Cassandra. All requests to Cassandra should go through a subclass.

Field Summary

Fields

Modifier and Type	Field	Description
protected ConsistencyLevel	consistency
protected CompletionStage<PreparedStatement>	preparedStmtAsync
protected String	queryString
protected Executor	readBinaryWorkers
protected CqlSession	session	A Cassandra session for use with this query.
protected Executor	writeWorkers	Worker threads that read and write from and to Cassandra.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	CassandraQuery()	For use with RESTeasy and CDI proxies.
	CassandraQuery(CqlSession session, String queryString, ConsistencyLevel consistency)

Method Summary

Modifier and Type	Method	Description
protected ResultSet	executeSyncRead(BoundStatement statement)
protected CompletionStage<PreparedStatement>	preparedStatementAsync()

Methods inherited from class java.lang.Object

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

Field Detail

session

protected final CqlSession session

A Cassandra session for use with this query.

consistency

protected final ConsistencyLevel consistency

queryString

protected final String queryString

preparedStmtAsync

protected CompletionStage<PreparedStatement> preparedStmtAsync

writeWorkers

protected final Executor writeWorkers

Worker threads that read and write from and to Cassandra. Reading and writing are thereby uncoupled from threads calling into this class.

readBinaryWorkers

protected final Executor readBinaryWorkers

Constructor Detail

CassandraQuery

protected CassandraQuery()

For use with RESTeasy and CDI proxies.

API Note:

This construtor is used by CDI runtimes that require a public, no-argument constructor. It should not be invoked directly in user code.

CassandraQuery

public CassandraQuery(CqlSession session,
                      String queryString,
                      ConsistencyLevel consistency)

Parameters:

session - a CqlSession to the Cassandra cluster

queryString - the CQL string for this query

consistency - the ConsistencyLevel to use for executions of this query

Method Detail

preparedStatementAsync

protected CompletionStage<PreparedStatement> preparedStatementAsync()

Returns:

the PreparedStatement that underlies this query

executeSyncRead

protected ResultSet executeSyncRead(BoundStatement statement)

Parameters:

statement - the CQL statement to execute

Returns:

the results of that statement