| /* |
| * 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.cassandra.db; |
| |
| import org.apache.cassandra.db.commitlog.CommitLog; |
| import org.apache.cassandra.db.commitlog.CommitLogPosition; |
| import org.apache.cassandra.exceptions.RequestExecutionException; |
| import org.apache.cassandra.tracing.Tracing; |
| import org.apache.cassandra.utils.concurrent.OpOrder; |
| |
| public class CassandraKeyspaceWriteHandler implements KeyspaceWriteHandler |
| { |
| private final Keyspace keyspace; |
| |
| public CassandraKeyspaceWriteHandler(Keyspace keyspace) |
| { |
| this.keyspace = keyspace; |
| } |
| |
| @Override |
| @SuppressWarnings("resource") // group is closed when CassandraWriteContext is closed |
| public WriteContext beginWrite(Mutation mutation, boolean makeDurable) throws RequestExecutionException |
| { |
| OpOrder.Group group = null; |
| try |
| { |
| group = Keyspace.writeOrder.start(); |
| |
| // write the mutation to the commitlog and memtables |
| CommitLogPosition position = null; |
| if (makeDurable) |
| { |
| Tracing.trace("Appending to commitlog"); |
| position = CommitLog.instance.add(mutation); |
| } |
| return new CassandraWriteContext(group, position); |
| } |
| catch (Throwable t) |
| { |
| if (group != null) |
| { |
| group.close(); |
| } |
| throw t; |
| } |
| } |
| |
| @SuppressWarnings("resource") // group is closed when CassandraWriteContext is closed |
| private WriteContext createEmptyContext() |
| { |
| OpOrder.Group group = null; |
| try |
| { |
| group = Keyspace.writeOrder.start(); |
| return new CassandraWriteContext(group, null); |
| } |
| catch (Throwable t) |
| { |
| if (group != null) |
| { |
| group.close(); |
| } |
| throw t; |
| } |
| } |
| |
| @Override |
| public WriteContext createContextForIndexing() |
| { |
| return createEmptyContext(); |
| } |
| |
| @Override |
| public WriteContext createContextForRead() |
| { |
| return createEmptyContext(); |
| } |
| } |