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Use Cassandra.Client in a thread safe manner
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presto-cassandra/src/main/java/com/facebook/presto/cassandra/CassandraThriftClient.java
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| /* | ||
| * Licensed 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:https://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 com.facebook.presto.cassandra; | ||
|
|
||
| import com.google.common.collect.Lists; | ||
| import org.apache.cassandra.thrift.Cassandra.Client; | ||
| import org.apache.cassandra.thrift.CfSplit; | ||
| import org.apache.cassandra.thrift.TokenRange; | ||
| import org.apache.thrift.TApplicationException; | ||
| import org.apache.thrift.TException; | ||
| import org.apache.thrift.protocol.TProtocol; | ||
| import org.apache.thrift.transport.TTransport; | ||
|
|
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| import java.util.List; | ||
|
|
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| public class CassandraThriftClient | ||
| { | ||
| private final CassandraThriftConnectionFactory connectionFactory; | ||
|
|
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| public CassandraThriftClient(CassandraThriftConnectionFactory connectionFactory) | ||
| { | ||
| this.connectionFactory = connectionFactory; | ||
| } | ||
|
|
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| public List<TokenRange> getRangeMap(String keyspace) | ||
| { | ||
| Client client = connectionFactory.create(); | ||
| try { | ||
| return client.describe_ring(keyspace); | ||
| } | ||
| catch (TException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| finally { | ||
| closeQuietly(client); | ||
| } | ||
| } | ||
|
|
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| public List<CfSplit> getSubSplits(String keyspace, String columnFamily, TokenRange range, int splitSize) | ||
| { | ||
| Client client = connectionFactory.create(); | ||
| try { | ||
| client.set_keyspace(keyspace); | ||
| try { | ||
| return client.describe_splits_ex(columnFamily, range.start_token, range.end_token, splitSize); | ||
| } | ||
| catch (TApplicationException e) { | ||
| // fallback to guessing split size if talking to a server without describe_splits_ex method | ||
| if (e.getType() == TApplicationException.UNKNOWN_METHOD) { | ||
| List<String> splitPoints = client.describe_splits(columnFamily, range.start_token, range.end_token, splitSize); | ||
| return tokenListToSplits(splitPoints, splitSize); | ||
| } | ||
| throw e; | ||
| } | ||
| } | ||
| catch (TException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| finally { | ||
| closeQuietly(client); | ||
| } | ||
| } | ||
|
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| private static List<CfSplit> tokenListToSplits(List<String> splitTokens, int splitSize) | ||
| { | ||
| List<CfSplit> splits = Lists.newArrayListWithExpectedSize(splitTokens.size() - 1); | ||
| for (int index = 0; index < splitTokens.size() - 1; index++) { | ||
| splits.add(new CfSplit(splitTokens.get(index), splitTokens.get(index + 1), splitSize)); | ||
| } | ||
| return splits; | ||
| } | ||
|
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| public static void closeQuietly(Client client) | ||
| { | ||
| try { | ||
| TProtocol inputProtocol = client.getInputProtocol(); | ||
| if (inputProtocol == null) { | ||
| return; | ||
| } | ||
| TTransport transport = inputProtocol.getTransport(); | ||
| if (transport == null) { | ||
| return; | ||
| } | ||
| transport.close(); | ||
| } | ||
| catch (Exception ignored) { | ||
| } | ||
| } | ||
| } |
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