| /* |
| * 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.iotdb.db.trigger.example; |
| |
| import org.apache.iotdb.trigger.api.Trigger; |
| import org.apache.iotdb.trigger.api.TriggerAttributes; |
| |
| import org.apache.tsfile.write.record.Tablet; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.File; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.FileChannel; |
| import java.nio.channels.FileLock; |
| import java.nio.file.FileAlreadyExistsException; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.nio.file.StandardOpenOption; |
| |
| public class TriggerFireTimesCounter implements Trigger { |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(TriggerFireTimesCounter.class); |
| private String TXT_PATH; |
| |
| private final int LOCK_FILE_RETRY_TIME = 10; |
| |
| @Override |
| public void onCreate(TriggerAttributes attributes) throws Exception { |
| String counterName = attributes.getString("name"); |
| TXT_PATH = |
| System.getProperty("user.dir") |
| + File.separator |
| + "target" |
| + File.separator |
| + "test-classes" |
| + File.separator |
| + counterName |
| + ".txt"; |
| Path path = Paths.get(TXT_PATH); |
| Files.deleteIfExists(path); |
| try { |
| Files.createFile(path); |
| } catch (FileAlreadyExistsException ignore) { |
| // do nothing |
| } |
| Files.write(Paths.get(TXT_PATH), String.valueOf(0).getBytes()); |
| } |
| |
| @Override |
| public void onDrop() throws Exception { |
| Files.deleteIfExists(Paths.get(TXT_PATH)); |
| } |
| |
| @Override |
| public boolean fire(Tablet tablet) throws Exception { |
| FileLock fileLock = null; |
| FileChannel fileChannel = null; |
| int retryNum = 0; |
| try { |
| fileChannel = FileChannel.open(Paths.get(TXT_PATH), StandardOpenOption.APPEND); |
| while (fileLock == null) { |
| fileLock = fileChannel.tryLock(); |
| if (fileLock == null) { |
| if (retryNum++ >= LOCK_FILE_RETRY_TIME) { |
| break; |
| } |
| Thread.sleep(100); |
| } |
| } |
| int rows = tablet.rowSize; |
| if (fileLock != null && fileLock.isValid()) { |
| String records = System.lineSeparator() + rows; |
| ByteBuffer byteBuffer = ByteBuffer.allocate(1024); |
| byteBuffer.put(records.getBytes()); |
| byteBuffer.flip(); |
| while (byteBuffer.hasRemaining()) { |
| fileChannel.write(byteBuffer); |
| } |
| } |
| } catch (Throwable t) { |
| LOGGER.warn("TriggerFireTimesCounter error", t); |
| return false; |
| } finally { |
| if (fileLock != null) { |
| fileLock.close(); |
| } |
| if (fileChannel != null) { |
| fileChannel.close(); |
| } |
| } |
| return true; |
| } |
| } |