DnsEvent.java revision 43724734d76c900fba9a004e28ff0ea4bd9d07ec
1/* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.net.metrics; 18 19import android.os.Parcel; 20import android.os.Parcelable; 21 22/** 23 * {@hide} 24 */ 25public class DnsEvent extends IpConnectivityEvent implements Parcelable { 26 public final int netId; 27 28 // The event type is currently only 1 or 2, so we store it as a byte. 29 public final byte[] eventTypes; 30 // Current getaddrinfo codes go from 1 to EAI_MAX = 15. gethostbyname returns errno, but there 31 // are fewer than 255 errno values. So we store the result code in a byte as well. 32 public final byte[] returnCodes; 33 // The latency is an integer because a) short arrays aren't parcelable and b) a short can only 34 // store a maximum latency of 32757 or 65535 ms, which is too short for pathologically slow 35 // queries. 36 public final int[] latenciesMs; 37 38 private DnsEvent(int netId, byte[] eventTypes, byte[] returnCodes, int[] latenciesMs) { 39 this.netId = netId; 40 this.eventTypes = eventTypes; 41 this.returnCodes = returnCodes; 42 this.latenciesMs = latenciesMs; 43 } 44 45 private DnsEvent(Parcel in) { 46 netId = in.readInt(); 47 eventTypes = in.createByteArray(); 48 returnCodes = in.createByteArray(); 49 latenciesMs = in.createIntArray(); 50 } 51 52 @Override 53 public void writeToParcel(Parcel out, int flags) { 54 out.writeInt(netId); 55 out.writeByteArray(eventTypes); 56 out.writeByteArray(returnCodes); 57 out.writeIntArray(latenciesMs); 58 } 59 60 public static final Parcelable.Creator<DnsEvent> CREATOR = new Parcelable.Creator<DnsEvent>() { 61 @Override 62 public DnsEvent createFromParcel(Parcel in) { 63 return new DnsEvent(in); 64 } 65 66 @Override 67 public DnsEvent[] newArray(int size) { 68 return new DnsEvent[size]; 69 } 70 }; 71 72 public static void logEvent( 73 int netId, byte[] eventTypes, byte[] returnCodes, int[] latenciesMs) { 74 IpConnectivityEvent.logEvent(IPCE_DNS_LOOKUPS, 75 new DnsEvent(netId, eventTypes, returnCodes, latenciesMs)); 76 } 77} 78