| /* |
| * 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.fs; |
| |
| import static com.google.common.base.Charsets.UTF_8; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.buffer.Unpooled; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.atomic.AtomicReference; |
| import lombok.extern.slf4j.Slf4j; |
| import org.apache.bookkeeper.common.concurrent.FutureUtils; |
| import org.apache.distributedlog.DLSN; |
| import org.apache.distributedlog.LogRecord; |
| import org.apache.distributedlog.api.AsyncLogWriter; |
| import org.apache.distributedlog.api.DistributedLogManager; |
| import org.apache.distributedlog.common.concurrent.FutureEventListener; |
| import org.apache.distributedlog.exceptions.UnexpectedException; |
| import org.apache.distributedlog.util.Utils; |
| |
| /** |
| * DistributedLog Output Stream. |
| */ |
| @Slf4j |
| class DLOutputStream extends OutputStream { |
| |
| private static final byte[] CONTROL_RECORD_CONTENT = "control".getBytes(UTF_8); |
| |
| private final DistributedLogManager dlm; |
| private final AsyncLogWriter writer; |
| |
| // positions |
| private final long[] syncPos = new long[1]; |
| private long writePos = 0L; |
| |
| // state |
| private final AtomicReference<Throwable> exception = new AtomicReference<>(null); |
| |
| DLOutputStream(DistributedLogManager dlm, |
| AsyncLogWriter writer) { |
| this.dlm = dlm; |
| this.writer = writer; |
| this.writePos = writer.getLastTxId() < 0L ? 0L : writer.getLastTxId(); |
| this.syncPos[0] = writePos; |
| } |
| |
| public synchronized long position() { |
| return syncPos[0]; |
| } |
| |
| @Override |
| public void write(int b) throws IOException { |
| byte[] data = new byte[] { (byte) b }; |
| write(data); |
| } |
| |
| @Override |
| public void write(byte[] b) throws IOException { |
| write(Unpooled.wrappedBuffer(b)); |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| write(Unpooled.wrappedBuffer(b, off, len)); |
| } |
| |
| private synchronized void write(ByteBuf buf) throws IOException { |
| Throwable cause = exception.get(); |
| if (null != cause) { |
| if (cause instanceof IOException) { |
| throw (IOException) cause; |
| } else { |
| throw new UnexpectedException("Encountered unknown issue", cause); |
| } |
| } |
| |
| writePos += buf.readableBytes(); |
| LogRecord record = new LogRecord(writePos, buf); |
| writer.write(record).whenComplete(new FutureEventListener<DLSN>() { |
| @Override |
| public void onSuccess(DLSN value) { |
| synchronized (syncPos) { |
| syncPos[0] = record.getTransactionId(); |
| } |
| } |
| |
| @Override |
| public void onFailure(Throwable cause) { |
| exception.compareAndSet(null, cause); |
| } |
| }); |
| } |
| |
| private CompletableFuture<DLSN> writeControlRecord() { |
| LogRecord record; |
| synchronized (this) { |
| record = new LogRecord(writePos, Unpooled.wrappedBuffer(CONTROL_RECORD_CONTENT)); |
| record.setControl(); |
| } |
| return writer.write(record); |
| } |
| |
| @Override |
| public void flush() throws IOException { |
| try { |
| FutureUtils.result(writeControlRecord()); |
| } catch (IOException ioe) { |
| throw ioe; |
| } catch (Exception e) { |
| log.error("Unexpected exception in DLOutputStream", e); |
| throw new UnexpectedException("unexpected exception in DLOutputStream#flush()", e); |
| } |
| } |
| |
| @Override |
| public void close() throws IOException { |
| Utils.ioResult( |
| writeControlRecord() |
| .thenCompose(ignored -> writer.asyncClose()) |
| .thenCompose(ignored -> dlm.asyncClose())); |
| } |
| } |