Example usage for org.apache.cassandra.cql3.statements SelectStatement keyspace

Introduction

In this page you can find the example usage for org.apache.cassandra.cql3.statements SelectStatement keyspace.

Prototype

public String keyspace() 

Source Link

Usage

From source file:com.stratio.cassandra.lucene.IndexQueryHandler.java

License:Apache License

private ResultMessage process(SelectStatement select, QueryState state, QueryOptions options,
        RowFilter.CustomExpression expression) throws ReflectiveOperationException {

    // Validate expression
    ColumnFamilyStore cfs = Keyspace.open(select.keyspace()).getColumnFamilyStore(select.columnFamily());
    Index index = (Index) cfs.indexManager.getIndex(expression.getTargetIndex());
    Search search = index.validate(expression);

    // Check paging
    int limit = select.getLimit(options);
    int page = getPageSize(select, options);
    if (search.isTopK()) {
        if (limit == Integer.MAX_VALUE) { // Avoid unlimited
            throw new InvalidRequestException(
                    "Top-k searches don't support paging, so a cautious LIMIT clause should be provided "
                            + "to prevent excessive memory consumption.");
        } else if (page < limit) {
            String json = UTF8Type.instance.compose(expression.getValue());
            logger.warn("Disabling paging of {} rows per page for top-k search requesting {} rows: {}", page,
                    limit, json);// www.j a v  a2  s .c om
            return executeWithoutPaging(select, state, options);
        }
    }

    // Process
    return execute(select, state, options);
}

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From source file:com.stratio.cassandra.lucene.IndexQueryHandler.java

License:Apache License

public ResultMessage.Rows executeWithoutPaging(SelectStatement select, QueryState state, QueryOptions options)
        throws ReflectiveOperationException {

    ConsistencyLevel cl = options.getConsistency();
    checkNotNull(cl, "Invalid empty consistency level");

    cl.validateForRead(select.keyspace());

    int nowInSec = FBUtilities.nowInSeconds();
    int userLimit = select.getLimit(options);
    ReadQuery query = select.getQuery(options, nowInSec, userLimit);

    Method method = select.getClass().getDeclaredMethod("execute", ReadQuery.class, QueryOptions.class,
            QueryState.class, int.class, int.class);
    method.setAccessible(true);/*www  .  jav  a2  s.co m*/
    return (ResultMessage.Rows) method.invoke(select, query, options, state, nowInSec, userLimit);
}

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