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      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 
     17 package android.net.metrics;
     18 
     19 import android.annotation.SystemApi;
     20 import android.os.Parcel;
     21 import android.os.Parcelable;
     22 
     23 /**
     24  * {@hide}
     25  */
     26 @SystemApi
     27 final public class DnsEvent extends IpConnectivityEvent implements Parcelable {
     28     public final int netId;
     29 
     30     // The event type is currently only 1 or 2, so we store it as a byte.
     31     public final byte[] eventTypes;
     32     // Current getaddrinfo codes go from 1 to EAI_MAX = 15. gethostbyname returns errno, but there
     33     // are fewer than 255 errno values. So we store the result code in a byte as well.
     34     public final byte[] returnCodes;
     35     // The latency is an integer because a) short arrays aren't parcelable and b) a short can only
     36     // store a maximum latency of 32757 or 65535 ms, which is too short for pathologically slow
     37     // queries.
     38     public final int[] latenciesMs;
     39 
     40     private DnsEvent(int netId, byte[] eventTypes, byte[] returnCodes, int[] latenciesMs) {
     41         this.netId = netId;
     42         this.eventTypes = eventTypes;
     43         this.returnCodes = returnCodes;
     44         this.latenciesMs = latenciesMs;
     45     }
     46 
     47     private DnsEvent(Parcel in) {
     48         this.netId = in.readInt();
     49         this.eventTypes = in.createByteArray();
     50         this.returnCodes = in.createByteArray();
     51         this.latenciesMs = in.createIntArray();
     52     }
     53 
     54     @Override
     55     public void writeToParcel(Parcel out, int flags) {
     56         out.writeInt(netId);
     57         out.writeByteArray(eventTypes);
     58         out.writeByteArray(returnCodes);
     59         out.writeIntArray(latenciesMs);
     60     }
     61 
     62     public int describeContents() {
     63         return 0;
     64     }
     65 
     66     @Override
     67     public String toString() {
     68         return String.format("DnsEvent(%d, %d events)", netId, eventTypes.length);
     69     }
     70 
     71     public static final Parcelable.Creator<DnsEvent> CREATOR = new Parcelable.Creator<DnsEvent>() {
     72         @Override
     73         public DnsEvent createFromParcel(Parcel in) {
     74             return new DnsEvent(in);
     75         }
     76 
     77         @Override
     78         public DnsEvent[] newArray(int size) {
     79             return new DnsEvent[size];
     80         }
     81     };
     82 
     83     public static void logEvent(
     84             int netId, byte[] eventTypes, byte[] returnCodes, int[] latenciesMs) {
     85         logEvent(new DnsEvent(netId, eventTypes, returnCodes, latenciesMs));
     86     }
     87 }
     88