| /** |
| * 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 org.apache.distributedlog.AsyncLogWriter; |
| import org.apache.distributedlog.DLSN; |
| 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.ProtocolUtils; |
| 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 org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import scala.runtime.AbstractFunction1; |
| |
| /** |
| * Operation to truncate a log stream. |
| */ |
| public class TruncateOp extends AbstractWriteOp { |
| |
| private static final Logger logger = LoggerFactory.getLogger(TruncateOp.class); |
| |
| private final Counter deniedTruncateCounter; |
| private final DLSN dlsn; |
| private final AccessControlManager accessControlManager; |
| |
| public TruncateOp(String stream, |
| DLSN dlsn, |
| StatsLogger statsLogger, |
| StatsLogger perStreamStatsLogger, |
| Long checksum, |
| Feature checksumDisabledFeature, |
| AccessControlManager accessControlManager) { |
| super(stream, requestStat(statsLogger, "truncate"), checksum, checksumDisabledFeature); |
| StreamOpStats streamOpStats = new StreamOpStats(statsLogger, perStreamStatsLogger); |
| this.deniedTruncateCounter = streamOpStats.requestDeniedCounter("truncate"); |
| this.accessControlManager = accessControlManager; |
| this.dlsn = dlsn; |
| } |
| |
| @Override |
| public Long computeChecksum() { |
| return ProtocolUtils.truncateOpCRC32(stream, dlsn); |
| } |
| |
| @Override |
| protected Future<WriteResponse> executeOp(AsyncLogWriter writer, |
| Sequencer sequencer, |
| Object txnLock) { |
| if (!stream.equals(writer.getStreamName())) { |
| logger.error("Truncate: Stream Name Mismatch in the Stream Map {}, {}", stream, writer.getStreamName()); |
| return Future.exception(new IllegalStateException("The stream mapping is incorrect, fail the request")); |
| } |
| return writer.truncate(dlsn).map(new AbstractFunction1<Boolean, WriteResponse>() { |
| @Override |
| public WriteResponse apply(Boolean v1) { |
| return ResponseUtils.writeSuccess(); |
| } |
| }); |
| } |
| |
| @Override |
| public void preExecute() throws DLException { |
| if (!accessControlManager.allowTruncate(stream)) { |
| deniedTruncateCounter.inc(); |
| throw new RequestDeniedException(stream, "truncate"); |
| } |
| super.preExecute(); |
| } |
| } |