content: /*
   * 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.commitlog;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  
  /**
   * A commitlog service that will block returning an ACK back to the a coordinator/client
   * for a minimum amount of time as we wait until the the commit log segment is flushed.
   */
  public class GroupCommitLogService extends AbstractCommitLogService
  {
      public GroupCommitLogService(CommitLog commitLog)
      {
          super(commitLog, "GROUP-COMMIT-LOG-WRITER", (int) DatabaseDescriptor.getCommitLogSyncGroupWindow());
      }
  
      protected void maybeWaitForSync(CommitLogSegment.Allocation alloc)
      {
          // wait until record has been safely persisted to disk
          pending.incrementAndGet();
          // wait for commitlog_sync_group_window
          alloc.awaitDiskSync(commitLog.metrics.waitingOnCommit);
          pending.decrementAndGet();
      }
  }
  
  