Merge "Dump most recently completed jobs." into sc-dev

apex/jobscheduler/service/java/com/android/server/job/JobSchedulerService.java

@@ -151,6 +151,8 @@ public class JobSchedulerService extends com.android.server.SystemService
     private static final boolean ENFORCE_MAX_JOBS = true;
     /** The maximum number of jobs that we allow an unprivileged app to schedule */
     private static final int MAX_JOBS_PER_APP = 100;
+    /** The number of the most recently completed jobs to keep track of for debugging purposes. */
+    private static final int NUM_COMPLETED_JOB_HISTORY = 20;
 
     @VisibleForTesting
     public static Clock sSystemClock = Clock.systemUTC();
@@ -297,6 +299,10 @@ public class JobSchedulerService extends com.android.server.SystemService
      */
     boolean mReportedActive;
 
+    private int mLastCompletedJobIndex = 0;
+    private final JobStatus[] mLastCompletedJobs = new JobStatus[NUM_COMPLETED_JOB_HISTORY];
+    private final long[] mLastCompletedJobTimeElapsed = new long[NUM_COMPLETED_JOB_HISTORY];
+
     /**
      * A mapping of which uids are currently in the foreground to their effective priority.
      */
@@ -1752,6 +1758,10 @@ public class JobSchedulerService extends com.android.server.SystemService
             Slog.d(TAG, "Completed " + jobStatus + ", reschedule=" + needsReschedule);
         }
 
+        mLastCompletedJobs[mLastCompletedJobIndex] = jobStatus;
+        mLastCompletedJobTimeElapsed[mLastCompletedJobIndex] = sElapsedRealtimeClock.millis();
+        mLastCompletedJobIndex = (mLastCompletedJobIndex + 1) % NUM_COMPLETED_JOB_HISTORY;
+
         // Intentionally not checking expedited job quota here. An app can't find out if it's run
         // out of quota when it asks JS to reschedule an expedited job. Instead, the rescheduled
         // EJ will just be demoted to a regular job if the app has no EJ quota left.
@@ -3298,6 +3308,37 @@ public class JobSchedulerService extends com.android.server.SystemService
                 }
             }
             pw.decreaseIndent();
+
+            pw.println();
+            boolean recentPrinted = false;
+            pw.println("Recently completed jobs:");
+            pw.increaseIndent();
+            for (int r = 1; r <= NUM_COMPLETED_JOB_HISTORY; ++r) {
+                // Print most recent first
+                final int idx = (mLastCompletedJobIndex + NUM_COMPLETED_JOB_HISTORY - r)
+                        % NUM_COMPLETED_JOB_HISTORY;
+                final JobStatus job = mLastCompletedJobs[idx];
+                if (job != null) {
+                    if (!predicate.test(job)) {
+                        continue;
+                    }
+                    recentPrinted = true;
+                    TimeUtils.formatDuration(mLastCompletedJobTimeElapsed[idx], nowElapsed, pw);
+                    pw.println();
+                    // Double indent for readability
+                    pw.increaseIndent();
+                    pw.increaseIndent();
+                    job.dump(pw, true, nowElapsed);
+                    pw.decreaseIndent();
+                    pw.decreaseIndent();
+                }
+            }
+            if (!recentPrinted) {
+                pw.println("None");
+            }
+            pw.decreaseIndent();
+            pw.println();
+
             if (filterUid == -1) {
                 pw.println();
                 pw.print("mReadyToRock="); pw.println(mReadyToRock);