| /** |
| * 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.service.stream; |
| |
| import static com.google.common.base.Charsets.UTF_8; |
| |
| import org.apache.distributedlog.AsyncLogWriter; |
| import org.apache.distributedlog.BKAsyncLogWriter; |
| import org.apache.distributedlog.DLSN; |
| import org.apache.distributedlog.LogRecord; |
| import org.apache.distributedlog.acl.AccessControlManager; |
| import org.apache.distributedlog.exceptions.DLException; |
| import org.apache.distributedlog.exceptions.RequestDeniedException; |
| import org.apache.distributedlog.service.ResponseUtils; |
| import org.apache.distributedlog.thrift.service.WriteResponse; |
| import org.apache.distributedlog.util.Sequencer; |
| import com.twitter.util.Future; |
| import org.apache.bookkeeper.feature.Feature; |
| import org.apache.bookkeeper.stats.Counter; |
| import org.apache.bookkeeper.stats.StatsLogger; |
| import scala.runtime.AbstractFunction1; |
| |
| /** |
| * Heartbeat Operation. |
| */ |
| public class HeartbeatOp extends AbstractWriteOp { |
| |
| static final byte[] HEARTBEAT_DATA = "heartbeat".getBytes(UTF_8); |
| |
| private final AccessControlManager accessControlManager; |
| private final Counter deniedHeartbeatCounter; |
| private final byte dlsnVersion; |
| |
| private boolean writeControlRecord = false; |
| |
| public HeartbeatOp(String stream, |
| StatsLogger statsLogger, |
| StatsLogger perStreamStatsLogger, |
| byte dlsnVersion, |
| Long checksum, |
| Feature checksumDisabledFeature, |
| AccessControlManager accessControlManager) { |
| super(stream, requestStat(statsLogger, "heartbeat"), checksum, checksumDisabledFeature); |
| StreamOpStats streamOpStats = new StreamOpStats(statsLogger, perStreamStatsLogger); |
| this.deniedHeartbeatCounter = streamOpStats.requestDeniedCounter("heartbeat"); |
| this.dlsnVersion = dlsnVersion; |
| this.accessControlManager = accessControlManager; |
| } |
| |
| public HeartbeatOp setWriteControlRecord(boolean writeControlRecord) { |
| this.writeControlRecord = writeControlRecord; |
| return this; |
| } |
| |
| @Override |
| protected Future<WriteResponse> executeOp(AsyncLogWriter writer, |
| Sequencer sequencer, |
| Object txnLock) { |
| // write a control record if heartbeat is the first request of the recovered log segment. |
| if (writeControlRecord) { |
| long txnId; |
| Future<DLSN> writeResult; |
| synchronized (txnLock) { |
| txnId = sequencer.nextId(); |
| writeResult = ((BKAsyncLogWriter) writer).writeControlRecord(new LogRecord(txnId, HEARTBEAT_DATA)); |
| } |
| return writeResult.map(new AbstractFunction1<DLSN, WriteResponse>() { |
| @Override |
| public WriteResponse apply(DLSN value) { |
| return ResponseUtils.writeSuccess().setDlsn(value.serialize(dlsnVersion)); |
| } |
| }); |
| } else { |
| return Future.value(ResponseUtils.writeSuccess()); |
| } |
| } |
| |
| @Override |
| public void preExecute() throws DLException { |
| if (!accessControlManager.allowAcquire(stream)) { |
| deniedHeartbeatCounter.inc(); |
| throw new RequestDeniedException(stream, "heartbeat"); |
| } |
| super.preExecute(); |
| } |
| } |