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.distributedlog;
  
  import java.io.IOException;
  import java.util.List;
  import org.apache.distributedlog.api.LogWriter;
  import org.apache.distributedlog.config.DynamicDistributedLogConfiguration;
  import org.apache.distributedlog.util.Utils;
  
  class BKSyncLogWriter extends BKAbstractLogWriter implements LogWriter {
  
      public BKSyncLogWriter(DistributedLogConfiguration conf,
                             DynamicDistributedLogConfiguration dynConf,
                             BKDistributedLogManager bkdlm) {
          super(conf, dynConf, bkdlm);
      }
      /**
       * Write log records to the stream.
       *
       * @param record operation
       */
      @Override
      public void write(LogRecord record) throws IOException {
          getLedgerWriter(record.getTransactionId(), false).write(record);
      }
  
      /**
       * Write edits logs operation to the stream.
       *
       * @param records list of records
       */
      @Override
      @Deprecated
      public int writeBulk(List<LogRecord> records) throws IOException {
          return getLedgerWriter(records.get(0).getTransactionId(), false).writeBulk(records);
      }
  
      /**
       * Flushes all the data up to this point,
       * adds the end of stream marker and marks the stream
       * as read-only in the metadata. No appends to the
       * stream will be allowed after this point
       */
      @Override
      public void markEndOfStream() throws IOException {
          Utils.ioResult(getLedgerWriter(DistributedLogConstants.MAX_TXID, true).markEndOfStream());
          closeAndComplete();
      }
  
      /**
       * All data that has been written to the stream so far will be flushed.
       * New data can be still written to the stream while flush is ongoing.
       */
      @Override
      public long flush() throws IOException {
          checkClosedOrInError("flush");
          long highestTransactionId = 0;
          BKLogSegmentWriter writer = getCachedLogWriter();
          if (null != writer) {
              highestTransactionId = Math.max(highestTransactionId, Utils.ioResult(writer.flush()));
          }
          return highestTransactionId;
      }
  
      /**
       * Commit data that is already flushed.
       * <p/>
       * This API is optional as the writer implements a policy for automatically syncing
       * the log records in the buffer. The buffered edits can be flushed when the buffer
       * becomes full or a certain period of time is elapsed.
       */
      @Override
      public long commit() throws IOException {
          checkClosedOrInError("commit");
  
          if (LOG.isDebugEnabled()) {
              LOG.debug("FlushAndSync Started");
          }
          long highestTransactionId = 0;
          BKLogSegmentWriter writer = getCachedLogWriter();
          if (null != writer) {
              highestTransactionId = Math.max(highestTransactionId, Utils.ioResult(writer.commit()));
              if (LOG.isDebugEnabled()) {
                  LOG.debug("FlushAndSync Completed");
              }
          } else if (LOG.isDebugEnabled()) {
              LOG.debug("FlushAndSync Completed - Nothing to Flush");
          }
          return highestTransactionId;
      }
  
      /**
       * Close the stream without necessarily flushing immediately.
       * This may be called if the stream is in error such as after a
       * previous write or close threw an exception.
       */
      @Override
      public void abort() throws IOException {
          super.abort();
      }
  }
  