ActivityMetricsLogger.java revision 0e381e278a2c2a3a7c86c9951ac5cbcdc3a186f4 
1package com.android.server.am;
2
3import static android.app.ActivityManager.StackId.DOCKED_STACK_ID;
4import static android.app.ActivityManager.StackId.FREEFORM_WORKSPACE_STACK_ID;
5import static android.app.ActivityManager.StackId.FULLSCREEN_WORKSPACE_STACK_ID;
6import static android.app.ActivityManager.StackId.HOME_STACK_ID;
7import static android.app.ActivityManager.StackId.PINNED_STACK_ID;
8import static com.android.server.am.ActivityStack.STACK_INVISIBLE;
9
10import android.app.ActivityManager.StackId;
11import android.content.Context;
12import android.os.SystemClock;
13
14import com.android.internal.logging.MetricsLogger;
15
16/**
17 * Handles logging into Tron.
18 */
19class ActivityMetricsLogger {
20    // Window modes we are interested in logging. If we ever introduce a new type, we need to add
21    // a value here and increase the {@link #TRON_WINDOW_STATE_VARZ_STRINGS} array.
22    private static final int WINDOW_STATE_STANDARD = 0;
23    private static final int WINDOW_STATE_SIDE_BY_SIDE = 1;
24    private static final int WINDOW_STATE_FREEFORM = 2;
25    private static final int WINDOW_STATE_INVALID = -1;
26
27    // Preallocated strings we are sending to tron, so we don't have to allocate a new one every
28    // time we log.
29    private static final String[] TRON_WINDOW_STATE_VARZ_STRINGS = {
30            "window_time_0", "window_time_1", "window_time_2"};
31
32    private int mWindowState = WINDOW_STATE_STANDARD;
33    private long mLastLogTimeSecs;
34    private final ActivityStackSupervisor mSupervisor;
35    private final Context mContext;
36
37    ActivityMetricsLogger(ActivityStackSupervisor supervisor, Context context) {
38        mLastLogTimeSecs = SystemClock.elapsedRealtime() / 1000;
39        mSupervisor = supervisor;
40        mContext = context;
41    }
42
43    void logWindowState() {
44        final long now = SystemClock.elapsedRealtime() / 1000;
45        if (mWindowState != WINDOW_STATE_INVALID) {
46            // We log even if the window state hasn't changed, because the user might remain in
47            // home/fullscreen move forever and we would like to track this kind of behavior
48            // too.
49            MetricsLogger.count(mContext, TRON_WINDOW_STATE_VARZ_STRINGS[mWindowState],
50                    (int) (now - mLastLogTimeSecs));
51        }
52        mLastLogTimeSecs = now;
53
54        ActivityStack stack = mSupervisor.getStack(DOCKED_STACK_ID);
55        if (stack != null && stack.getStackVisibilityLocked() != STACK_INVISIBLE) {
56            mWindowState = WINDOW_STATE_SIDE_BY_SIDE;
57            return;
58        }
59        mWindowState = WINDOW_STATE_INVALID;
60        stack = mSupervisor.getFocusedStack();
61        if (stack.mStackId == PINNED_STACK_ID) {
62            stack = mSupervisor.findStackBehind(stack);
63        }
64        if (stack.mStackId == HOME_STACK_ID
65                || stack.mStackId == FULLSCREEN_WORKSPACE_STACK_ID) {
66            mWindowState = WINDOW_STATE_STANDARD;
67        } else if (stack.mStackId == DOCKED_STACK_ID) {
68            throw new IllegalStateException("Docked stack shouldn't be the focused stack, "
69                    + "because it reported not being visible.");
70        } else if (stack.mStackId == FREEFORM_WORKSPACE_STACK_ID) {
71            mWindowState = WINDOW_STATE_FREEFORM;
72        } else if (StackId.isStaticStack(stack.mStackId)) {
73            throw new IllegalStateException("Unknown stack=" + stack);
74        }
75    }
76}
77