package com.riptano.cassandra.hector.example;
import me.prettyprint.cassandra.serializers.StringSerializer;
import me.prettyprint.hector.api.Cluster;
import me.prettyprint.hector.api.Keyspace;
import me.prettyprint.hector.api.beans.OrderedRows;
import me.prettyprint.hector.api.beans.Row;
import me.prettyprint.hector.api.exceptions.HectorException;
import me.prettyprint.hector.api.factory.HFactory;
import me.prettyprint.hector.api.mutation.Mutator;
import me.prettyprint.hector.api.query.QueryResult;
import me.prettyprint.hector.api.query.RangeSlicesQuery;
/**
* A simple example showing what it takes to page over results using
* get_range_slices.
*
* To run this example from maven:
* mvn -e exec:java -Dexec.mainClass="com.riptano.cassandra.hector.example.PaginateGetRangeSlices"
*
* @author zznate
*
*/
public class PaginateGetRangeSlices {
private static StringSerializer stringSerializer = StringSerializer.get();
public static void main(String[] args) throws Exception {
Cluster cluster = HFactory.getOrCreateCluster("TestCluster", "localhost:9160");
Keyspace keyspaceOperator = HFactory.createKeyspace("Keyspace1", cluster);
try {
Mutator<String> mutator = HFactory.createMutator(keyspaceOperator, stringSerializer);
for (int i = 0; i < 20; i++) {
mutator.addInsertion("fake_key_" + i, "Standard1", HFactory.createStringColumn("fake_column_0", "fake_value_0_" + i))
.addInsertion("fake_key_" + i, "Standard1", HFactory.createStringColumn("fake_column_1", "fake_value_1_" + i))
.addInsertion("fake_key_" + i, "Standard1", HFactory.createStringColumn("fake_column_2", "fake_value_2_" + i));
}
mutator.execute();
RangeSlicesQuery<String, String, String> rangeSlicesQuery =
HFactory.createRangeSlicesQuery(keyspaceOperator, stringSerializer, stringSerializer, stringSerializer);
rangeSlicesQuery.setColumnFamily("Standard1");
rangeSlicesQuery.setKeys("", "");
rangeSlicesQuery.setRange("", "", false, 3);
rangeSlicesQuery.setRowCount(11);
QueryResult<OrderedRows<String, String, String>> result = rangeSlicesQuery.execute();
OrderedRows<String, String, String> orderedRows = result.get();
Row<String,String,String> lastRow = orderedRows.peekLast();
System.out.println("Contents of rows: \n");
for (Row<String, String, String> r : orderedRows) {
System.out.println(" " + r);
}
System.out.println("Should have 11 rows: " + orderedRows.getCount());
rangeSlicesQuery.setKeys(lastRow.getKey(), "");
orderedRows = rangeSlicesQuery.execute().get();
System.out.println("2nd page Contents of rows: \n");
for (Row<String, String, String> row : orderedRows) {
System.out.println(" " + row);
}
} catch (HectorException he) {
he.printStackTrace();
}
cluster.getConnectionManager().shutdown();
}
}