| /** |
| * |
| * 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.bookie; |
| |
| import com.google.common.util.concurrent.RateLimiter; |
| import java.io.IOException; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import org.apache.bookkeeper.conf.ServerConfiguration; |
| |
| /** |
| * Abstract entry log compactor used for compaction. |
| */ |
| public abstract class AbstractLogCompactor { |
| |
| protected final ServerConfiguration conf; |
| protected final Throttler throttler; |
| |
| /** |
| * LogRemovalListener. |
| */ |
| public interface LogRemovalListener { |
| void removeEntryLog(long logToRemove); |
| } |
| |
| protected final LogRemovalListener logRemovalListener; |
| |
| public AbstractLogCompactor(ServerConfiguration conf, LogRemovalListener logRemovalListener) { |
| this.conf = conf; |
| this.throttler = new Throttler(conf); |
| this.logRemovalListener = logRemovalListener; |
| } |
| |
| /** |
| * Compact entry log file. |
| * @param entryLogMeta log metadata for the entry log to be compacted |
| * @return true for succeed |
| */ |
| public abstract boolean compact(EntryLogMetadata entryLogMeta); |
| |
| /** |
| * Do nothing by default. Intended for subclass to override this method. |
| */ |
| public void cleanUpAndRecover() {} |
| |
| /** |
| * class Throttler. |
| */ |
| public static class Throttler { |
| private final RateLimiter rateLimiter; |
| private final boolean isThrottleByBytes; |
| private final AtomicBoolean cancelled = new AtomicBoolean(false); |
| |
| Throttler(ServerConfiguration conf) { |
| this.isThrottleByBytes = conf.getIsThrottleByBytes(); |
| this.rateLimiter = RateLimiter.create(this.isThrottleByBytes |
| ? conf.getCompactionRateByBytes() : conf.getCompactionRateByEntries()); |
| } |
| |
| // acquire. if bybytes: bytes of this entry; if byentries: 1. |
| boolean tryAcquire(int permits, long timeout, TimeUnit unit) { |
| return rateLimiter.tryAcquire(this.isThrottleByBytes ? permits : 1, timeout, unit); |
| } |
| |
| // GC thread will check the status for the rate limiter |
| // If the compactor is being stopped by other threads, |
| // and the GC thread is still limited, the compact task will be stopped. |
| public void acquire(int permits) throws IOException { |
| long timeout = 100; |
| long start = System.currentTimeMillis(); |
| while (!tryAcquire(permits, timeout, TimeUnit.MILLISECONDS)) { |
| if (cancelled.get()) { |
| throw new IOException("Failed to get permits takes " |
| + (System.currentTimeMillis() - start) |
| + " ms may be compactor has been shutting down"); |
| } |
| try { |
| TimeUnit.MILLISECONDS.sleep(timeout); |
| } catch (InterruptedException e) { |
| // ignore |
| } |
| } |
| } |
| |
| public void cancelledAcquire() { |
| cancelled.set(true); |
| } |
| } |
| |
| } |