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.bookkeeper.proto;
  
  import static org.apache.bookkeeper.client.LedgerHandle.INVALID_ENTRY_ID;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import io.netty.util.ReferenceCountUtil;
  import org.apache.bookkeeper.client.BKException;
  
  class ReadCompletion extends CompletionValue {
      final BookkeeperInternalCallbacks.ReadEntryCallback cb;
  
      public ReadCompletion(final CompletionKey key,
                            final BookkeeperInternalCallbacks.ReadEntryCallback originalCallback,
                            final Object originalCtx,
                            long ledgerId, final long entryId,
                            PerChannelBookieClient perChannelBookieClient) {
          super("Read", originalCtx, ledgerId, entryId, perChannelBookieClient);
          this.opLogger = perChannelBookieClient.readEntryOpLogger;
          this.timeoutOpLogger = perChannelBookieClient.readTimeoutOpLogger;
          this.cb = (rc, ledgerId1, entryId1, buffer, ctx) -> {
              logOpResult(rc);
              originalCallback.readEntryComplete(rc,
                      ledgerId1, entryId1,
                      buffer, originalCtx);
              key.release();
          };
      }
  
      @Override
      public void errorOut() {
          errorOut(BKException.Code.BookieHandleNotAvailableException);
      }
  
      @Override
      public void errorOut(final int rc) {
          errorOutAndRunCallback(
                  () -> cb.readEntryComplete(rc, ledgerId,
                          entryId, null, ctx));
      }
  
      @Override
      public void setOutstanding() {
          perChannelBookieClient.readEntryOutstanding.inc();
      }
  
      @Override
      public void handleV2Response(long ledgerId, long entryId,
                                   BookkeeperProtocol.StatusCode status,
                                   BookieProtocol.Response response) {
          perChannelBookieClient.readEntryOutstanding.dec();
          if (!(response instanceof BookieProtocol.ReadResponse)) {
              return;
          }
          BookieProtocol.ReadResponse readResponse = (BookieProtocol.ReadResponse) response;
          handleReadResponse(ledgerId, entryId, status, readResponse.getData(),
                  INVALID_ENTRY_ID, -1L);
      }
  
      @Override
      public void handleV3Response(BookkeeperProtocol.Response response) {
          perChannelBookieClient.readEntryOutstanding.dec();
          BookkeeperProtocol.ReadResponse readResponse = response.getReadResponse();
          BookkeeperProtocol.StatusCode status = response.getStatus() == BookkeeperProtocol.StatusCode.EOK
                  ? readResponse.getStatus() : response.getStatus();
          ByteBuf buffer = Unpooled.EMPTY_BUFFER;
          if (readResponse.hasBody()) {
              buffer = Unpooled.wrappedBuffer(readResponse.getBody().asReadOnlyByteBuffer());
          }
          long maxLAC = INVALID_ENTRY_ID;
          if (readResponse.hasMaxLAC()) {
              maxLAC = readResponse.getMaxLAC();
          }
          long lacUpdateTimestamp = -1L;
          if (readResponse.hasLacUpdateTimestamp()) {
              lacUpdateTimestamp = readResponse.getLacUpdateTimestamp();
          }
          handleReadResponse(readResponse.getLedgerId(),
                  readResponse.getEntryId(),
                  status, buffer, maxLAC, lacUpdateTimestamp);
          ReferenceCountUtil.release(
                  buffer); // meaningless using unpooled, but client may expect to hold the last reference
      }
  
      private void handleReadResponse(long ledgerId,
                                      long entryId,
                                      BookkeeperProtocol.StatusCode status,
                                      ByteBuf buffer,
                                      long maxLAC, // max known lac piggy-back from bookies
                                      long lacUpdateTimestamp) { // the timestamp when the lac is updated.
          int readableBytes = buffer.readableBytes();
          if (LOG.isDebugEnabled()) {
              logResponse(status, "ledger", ledgerId, "entry", entryId, "entryLength", readableBytes);
          }
  
          int rc = convertStatus(status, BKException.Code.ReadException);
  
          if (maxLAC > INVALID_ENTRY_ID && (ctx instanceof BookkeeperInternalCallbacks.ReadEntryCallbackCtx)) {
              ((BookkeeperInternalCallbacks.ReadEntryCallbackCtx) ctx).setLastAddConfirmed(maxLAC);
          }
          if (lacUpdateTimestamp > -1L && (ctx instanceof ReadLastConfirmedAndEntryContext)) {
              ((ReadLastConfirmedAndEntryContext) ctx).setLacUpdateTimestamp(lacUpdateTimestamp);
          }
          cb.readEntryComplete(rc, ledgerId, entryId, buffer.slice(), ctx);
      }
  }
  