| /** |
| * 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 com.twitter.distributedlog.benchmark.stream; |
| |
| import java.util.Enumeration; |
| import org.apache.bookkeeper.client.BKException; |
| import org.apache.bookkeeper.client.LedgerEntry; |
| import org.apache.bookkeeper.client.LedgerHandle; |
| import org.apache.bookkeeper.proto.BookkeeperInternalCallbacks.ReadEntryListener; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Read ledgers in batches. |
| */ |
| public class LedgerBatchReader implements Runnable { |
| |
| private static final Logger logger = LoggerFactory.getLogger(LedgerBatchReader.class); |
| |
| private final LedgerHandle lh; |
| private final ReadEntryListener readEntryListener; |
| private final int batchSize; |
| |
| public LedgerBatchReader(LedgerHandle lh, |
| ReadEntryListener readEntryListener, |
| int batchSize) { |
| this.lh = lh; |
| this.batchSize = batchSize; |
| this.readEntryListener = readEntryListener; |
| } |
| |
| @Override |
| public void run() { |
| long lac = lh.getLastAddConfirmed(); |
| |
| long entryId = 0L; |
| |
| while (entryId <= lac) { |
| long startEntryId = entryId; |
| long endEntryId = Math.min(startEntryId + batchSize - 1, lac); |
| |
| Enumeration<LedgerEntry> entries = null; |
| while (null == entries) { |
| try { |
| entries = lh.readEntries(startEntryId, endEntryId); |
| } catch (BKException bke) { |
| logger.error("Encountered exceptions on reading [ {} - {} ] ", |
| new Object[] { startEntryId, endEntryId, bke }); |
| } catch (InterruptedException ie) { |
| Thread.currentThread().interrupt(); |
| break; |
| } |
| } |
| if (null == entries) { |
| break; |
| } |
| |
| while (entries.hasMoreElements()) { |
| LedgerEntry entry = entries.nextElement(); |
| readEntryListener.onEntryComplete(BKException.Code.OK, lh, entry, null); |
| } |
| |
| entryId = endEntryId + 1; |
| } |
| |
| } |
| } |