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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.nosqldatastore.cassandra;
import me.prettyprint.cassandra.serializers.StringSerializer;
import me.prettyprint.cassandra.service.template.ColumnFamilyResult;
import me.prettyprint.cassandra.service.template.ColumnFamilyTemplate;
import me.prettyprint.cassandra.service.template.ColumnFamilyUpdater;
import me.prettyprint.cassandra.service.template.ThriftColumnFamilyTemplate;
import me.prettyprint.hector.api.Cluster;
import me.prettyprint.hector.api.Keyspace;
import me.prettyprint.hector.api.ddl.ColumnFamilyDefinition;
import me.prettyprint.hector.api.exceptions.HInvalidRequestException;
import me.prettyprint.hector.api.factory.HFactory;
import org.apache.tuscany.nosqldatastore.Group;
import org.apache.tuscany.nosqldatastore.exception.DuplicateEntryException;
import org.apache.tuscany.nosqldatastore.exception.EntryNotFoundException;
class CassandraGroup implements Group {
private ColumnFamilyTemplate<String,String> template;
private ColumnFamilyUpdater<String, String> updater;
private final StringSerializer se = StringSerializer.get();
CassandraGroup(String groupId, Keyspace keyspace, Cluster cluster) {
try{
ColumnFamilyDefinition cfDef = HFactory.createColumnFamilyDefinition(keyspace.getKeyspaceName(), groupId);
cluster.addColumnFamily(cfDef);
}catch (HInvalidRequestException e){
System.out.println("Connect to the existing group...");
}
template = new ThriftColumnFamilyTemplate<String, String>(keyspace,groupId,se,se,HFactory.createMutator(keyspace, se));
}
public void addEntry(String key, String value) throws DuplicateEntryException {
ColumnFamilyResult wrapper = template.queryColumns(key);
if(wrapper.getString(key) == null){
updater = template.createUpdater(key);
updater.setString(key, value);
template.update(updater);
template.addColumn(key, se);
return;
}
throw new DuplicateEntryException("Entry already exist for key "+key);
}
public void deleteEntry(String key) throws EntryNotFoundException {
ColumnFamilyResult wrapper = template.queryColumns(key);
if(wrapper.getString(key) != null){
template.deleteColumn(key, key);
return;
}
throw new EntryNotFoundException("Entry does not exist for key "+key);
}
public String getEntry(String key) throws EntryNotFoundException {
ColumnFamilyResult wrapper = template.queryColumns(key);
String entry = wrapper.getString(key);
if(entry != null){
return entry;
}
throw new EntryNotFoundException("Entry does not exist for key "+key);
}
public void updateEntry(String key, String value) throws EntryNotFoundException {
ColumnFamilyResult wrapper = template.queryColumns(key);
if(wrapper.getString(key) != null){
updater = template.createUpdater(key);
updater.setString(key, value);
template.update(updater);
template.addColumn(key, se);
return;
}
throw new EntryNotFoundException("Entry does not exist for key "+key);
}
}
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