1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 package ohos.devtools.services.hiperf; 16 17 import java.io.File; 18 import java.io.FileInputStream; 19 import java.io.IOException; 20 import java.nio.ByteBuffer; 21 import java.nio.ByteOrder; 22 import java.nio.MappedByteBuffer; 23 import java.nio.channels.FileChannel; 24 import java.nio.charset.StandardCharsets; 25 26 /** 27 * ParsePerf Parent Class. 28 * 29 * @since 2021/9/20 30 */ 31 public abstract class ParsePerf { 32 33 /** 34 * insertSample to db 35 */ insertSample()36 public abstract void insertSample(); 37 38 /** 39 * parseFile parse perf.trace file 40 * 41 * @param file proto buf file 42 * @throws IOException read Exception 43 */ parseFile(File file)44 public abstract void parseFile(File file) throws IOException; 45 46 /** 47 * read File to ByteBuffer 48 * 49 * @param file trace file 50 * @return ByteBuffer 51 * @throws IOException read Exception 52 */ byteBufferFromFile(File file)53 protected ByteBuffer byteBufferFromFile(File file) throws IOException { 54 try (FileInputStream dataFile = new FileInputStream(file)) { 55 MappedByteBuffer buffer = dataFile.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, file.length()); 56 buffer.order(ByteOrder.LITTLE_ENDIAN); 57 return buffer; 58 } 59 } 60 61 /** 62 * verify Head judge file is correct 63 * 64 * @param buffer ByteBuffer 65 * @param head Verify Head 66 */ verifyHead(ByteBuffer buffer, String head)67 protected void verifyHead(ByteBuffer buffer, String head) { 68 byte[] sign = new byte[head.length()]; 69 buffer.get(sign); 70 if (!(new String(sign, StandardCharsets.UTF_8)).equals(head)) { 71 throw new IllegalStateException("perf trace could not be parsed due to magic number mismatch."); 72 } 73 } 74 } 75