| /** |
| * 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.mledger.impl; |
| |
| import com.google.common.collect.Range; |
| import lombok.extern.slf4j.Slf4j; |
| import org.apache.bookkeeper.client.BookKeeper; |
| import org.apache.bookkeeper.mledger.AsyncCallbacks; |
| import org.apache.bookkeeper.mledger.ManagedLedgerConfig; |
| import org.apache.bookkeeper.mledger.ReadOnlyCursor; |
| import org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl.PositionBound; |
| import org.apache.bookkeeper.mledger.proto.MLDataFormats; |
| |
| @Slf4j |
| public class ReadOnlyCursorImpl extends ManagedCursorImpl implements ReadOnlyCursor { |
| |
| public ReadOnlyCursorImpl(BookKeeper bookkeeper, ManagedLedgerConfig config, ManagedLedgerImpl ledger, |
| PositionImpl startPosition, String cursorName) { |
| super(bookkeeper, config, ledger, cursorName); |
| |
| if (startPosition.equals(PositionImpl.EARLIEST)) { |
| readPosition = ledger.getFirstPosition().getNext(); |
| } else { |
| readPosition = startPosition; |
| } |
| |
| if (ledger.getLastPosition().compareTo(readPosition) <= 0) { |
| messagesConsumedCounter = 0; |
| } else { |
| messagesConsumedCounter = -getNumberOfEntries(Range.closed(readPosition, ledger.getLastPosition())); |
| } |
| |
| this.state = State.NoLedger; |
| } |
| |
| @Override |
| public void skipEntries(int numEntriesToSkip) { |
| log.info("[{}] Skipping {} entries on read-only cursor {}", ledger.getName(), numEntriesToSkip, getName()); |
| READ_POSITION_UPDATER.getAndUpdate(this, lastRead -> |
| ledger.getPositionAfterN(lastRead, numEntriesToSkip, PositionBound.startIncluded).getNext()); |
| } |
| |
| @Override |
| public void asyncClose(final AsyncCallbacks.CloseCallback callback, final Object ctx) { |
| state = State.Closed; |
| callback.closeComplete(ctx); |
| } |
| |
| public MLDataFormats.ManagedLedgerInfo.LedgerInfo getCurrentLedgerInfo() { |
| return this.ledger.getLedgersInfo().get(this.readPosition.getLedgerId()); |
| } |
| |
| @Override |
| public long getNumberOfEntries(Range<PositionImpl> range) { |
| return this.ledger.getNumberOfEntries(range); |
| } |
| } |