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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 com.android.internal.telephony.metrics;
     18 
     19 import android.os.SystemClock;
     20 
     21 import com.android.internal.telephony.nano.TelephonyProto.SmsSession;
     22 
     23 import java.util.ArrayDeque;
     24 import java.util.Deque;
     25 import java.util.concurrent.atomic.AtomicInteger;
     26 
     27 /** The ongoing SMS session */
     28 public class InProgressSmsSession {
     29 
     30     /** Maximum events stored in the session */
     31     private static final int MAX_EVENTS = 20;
     32 
     33     /** Phone id */
     34     public final int phoneId;
     35 
     36     /** SMS session events */
     37     public final Deque<SmsSession.Event> events;
     38 
     39     /** Sms session starting system time in minute */
     40     public final int startSystemTimeMin;
     41 
     42     /** Sms session starting elapsed time in milliseconds */
     43     public final long startElapsedTimeMs;
     44 
     45     /** The last event's time */
     46     private long mLastElapsedTimeMs;
     47 
     48     /** Indicating events dropped */
     49     private boolean mEventsDropped = false;
     50 
     51     /** The expected SMS response #. One session could contain multiple SMS requests/responses. */
     52     private AtomicInteger mNumExpectedResponses = new AtomicInteger(0);
     53 
     54     /** Increase the expected response # */
     55     public void increaseExpectedResponse() {
     56         mNumExpectedResponses.incrementAndGet();
     57     }
     58 
     59     /** Decrease the expected response # */
     60     public void decreaseExpectedResponse() {
     61         mNumExpectedResponses.decrementAndGet();
     62     }
     63 
     64     /** Get the expected response # */
     65     public int getNumExpectedResponses() {
     66         return mNumExpectedResponses.get();
     67     }
     68 
     69     /** Check if events dropped */
     70     public boolean isEventsDropped() { return mEventsDropped; }
     71 
     72     /**
     73      * Constructor
     74      *
     75      * @param phoneId Phone id
     76      */
     77     public InProgressSmsSession(int phoneId) {
     78         this.phoneId = phoneId;
     79         events = new ArrayDeque<>();
     80         // Save session start with lowered precision due to the privacy requirements
     81         startSystemTimeMin = TelephonyMetrics.roundSessionStart(System.currentTimeMillis());
     82         startElapsedTimeMs = SystemClock.elapsedRealtime();
     83         mLastElapsedTimeMs = startElapsedTimeMs;
     84     }
     85 
     86     /**
     87      * Add event
     88      *
     89      * @param builder Event builder
     90      */
     91     public void addEvent(SmsSessionEventBuilder builder) {
     92         addEvent(SystemClock.elapsedRealtime(), builder);
     93     }
     94 
     95     /**
     96      * Add event
     97      *
     98      * @param timestamp Timestamp to be recoded with the event
     99      * @param builder Event builder
    100      */
    101     public synchronized void addEvent(long timestamp, SmsSessionEventBuilder builder) {
    102         if (events.size() >= MAX_EVENTS) {
    103             events.removeFirst();
    104             mEventsDropped = true;
    105         }
    106 
    107         builder.setDelay(TelephonyMetrics.toPrivacyFuzzedTimeInterval(
    108                 mLastElapsedTimeMs, timestamp));
    109 
    110         events.add(builder.build());
    111         mLastElapsedTimeMs = timestamp;
    112     }
    113 }
    114