| /** |
| * 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.camel.component.hdfs; |
| |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.concurrent.locks.ReadWriteLock; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| import javax.xml.ws.Holder; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Message; |
| import org.apache.camel.Processor; |
| import org.apache.camel.impl.DefaultEndpoint; |
| import org.apache.camel.impl.DefaultMessage; |
| import org.apache.camel.impl.ScheduledPollConsumer; |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.PathFilter; |
| |
| public final class HdfsConsumer extends ScheduledPollConsumer { |
| |
| private final HdfsConfiguration config; |
| private final StringBuilder hdfsPath; |
| private final Processor processor; |
| private AtomicBoolean idle = new AtomicBoolean(false); |
| private final ReadWriteLock rwlock = new ReentrantReadWriteLock(); |
| private HdfsInputStream istream; |
| |
| public HdfsConsumer(DefaultEndpoint endpoint, Processor processor, HdfsConfiguration config) { |
| super(endpoint, processor); |
| this.config = config; |
| this.hdfsPath = config.getFileSystemType().getHdfsPath(config); |
| this.processor = processor; |
| } |
| |
| @Override |
| protected void doStart() throws Exception { |
| super.setInitialDelay(config.getInitialDelay()); |
| super.setDelay(config.getDelay()); |
| super.setUseFixedDelay(false); |
| super.doStart(); |
| } |
| |
| @Override |
| protected int poll() throws Exception { |
| class ExcludePathFilter implements PathFilter { |
| public boolean accept(Path path) { |
| return !(path.toString().endsWith(config.getOpenedSuffix()) || path.toString().endsWith(config.getReadSuffix())); |
| } |
| } |
| |
| int numMessages = 0; |
| |
| HdfsInfo info = new HdfsInfo(this.hdfsPath.toString()); |
| FileStatus fileStatuses[]; |
| if (info.getFileSystem().isFile(info.getPath())) { |
| fileStatuses = info.getFileSystem().globStatus(info.getPath()); |
| } else { |
| Path pattern = info.getPath().suffix("/" + this.config.getPattern()); |
| fileStatuses = info.getFileSystem().globStatus(pattern, new ExcludePathFilter()); |
| } |
| if (fileStatuses.length > 0) { |
| this.idle.set(false); |
| } |
| for (int i = 0; i < fileStatuses.length; ++i) { |
| try { |
| this.rwlock.writeLock().lock(); |
| this.istream = HdfsInputStream.createInputStream(fileStatuses[i].getPath().toString(), this.config); |
| } finally { |
| this.rwlock.writeLock().unlock(); |
| } |
| |
| Holder<Object> key = new Holder<Object>(); |
| Holder<Object> value = new Holder<Object>(); |
| while (this.istream.next(key, value) != 0) { |
| Exchange exchange = this.getEndpoint().createExchange(); |
| Message message = new DefaultMessage(); |
| if (key.value != null) { |
| message.setHeader(HdfsHeader.KEY.name(), key.value); |
| } |
| message.setBody(value.value); |
| exchange.setIn(message); |
| this.processor.process(exchange); |
| numMessages++; |
| } |
| this.istream.close(); |
| } |
| this.idle.set(true); |
| return numMessages; |
| } |
| |
| public HdfsInputStream getIstream() { |
| try { |
| rwlock.readLock().lock(); |
| return istream; |
| } finally { |
| rwlock.readLock().unlock(); |
| } |
| } |
| |
| public AtomicBoolean isIdle() { |
| return idle; |
| } |
| |
| } |