1 files changed, 138 insertions, 0 deletions
diff --git a/mobile/android/base/java/org/mozilla/gecko/health/SessionInformation.java b/mobile/android/base/java/org/mozilla/gecko/health/SessionInformation.java
new file mode 100644
index 000000000..ad65918e1
--- /dev/null
+++ b/mobile/android/base/java/org/mozilla/gecko/health/SessionInformation.java
@@ -0,0 +1,138 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.health;
+
+import android.content.SharedPreferences;
+import android.util.Log;
+
+import org.mozilla.gecko.GeckoApp;
+import org.mozilla.gecko.GeckoAppShell;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+public class SessionInformation {
+    private static final String LOG_TAG = "GeckoSessInfo";
+
+    public static final String PREFS_SESSION_START = "sessionStart";
+
+    public final long wallStartTime;    // System wall clock.
+    public final long realStartTime;    // Realtime clock.
+
+    private final boolean wasOOM;
+    private final boolean wasStopped;
+
+    private volatile long timedGeckoStartup = -1;
+    private volatile long timedJavaStartup = -1;
+
+    // Current sessions don't (right now) care about wasOOM/wasStopped.
+    // Eventually we might want to lift that logic out of GeckoApp.
+    public SessionInformation(long wallTime, long realTime) {
+        this(wallTime, realTime, false, false);
+    }
+
+    // Previous sessions do...
+    public SessionInformation(long wallTime, long realTime, boolean wasOOM, boolean wasStopped) {
+        this.wallStartTime = wallTime;
+        this.realStartTime = realTime;
+        this.wasOOM = wasOOM;
+        this.wasStopped = wasStopped;
+    }
+
+    /**
+     * Initialize a new SessionInformation instance from the supplied prefs object.
+     *
+     * This includes retrieving OOM/crash data, as well as timings.
+     *
+     * If no wallStartTime was found, that implies that the previous
+     * session was correctly recorded, and an object with a zero
+     * wallStartTime is returned.
+     */
+    public static SessionInformation fromSharedPrefs(SharedPreferences prefs) {
+        boolean wasOOM = prefs.getBoolean(GeckoAppShell.PREFS_OOM_EXCEPTION, false);
+        boolean wasStopped = prefs.getBoolean(GeckoApp.PREFS_WAS_STOPPED, true);
+        long wallStartTime = prefs.getLong(PREFS_SESSION_START, 0L);
+        long realStartTime = 0L;
+        Log.d(LOG_TAG, "Building SessionInformation from prefs: " +
+                       wallStartTime + ", " + realStartTime + ", " +
+                       wasStopped + ", " + wasOOM);
+        return new SessionInformation(wallStartTime, realStartTime, wasOOM, wasStopped);
+    }
+
+    /**
+     * Initialize a new SessionInformation instance to 'split' the current
+     * session.
+     */
+    public static SessionInformation forRuntimeTransition() {
+        final boolean wasOOM = false;
+        final boolean wasStopped = true;
+        final long wallStartTime = System.currentTimeMillis();
+        final long realStartTime = android.os.SystemClock.elapsedRealtime();
+        Log.v(LOG_TAG, "Recording runtime session transition: " +
+                       wallStartTime + ", " + realStartTime);
+        return new SessionInformation(wallStartTime, realStartTime, wasOOM, wasStopped);
+    }
+
+    public boolean wasKilled() {
+        return wasOOM || !wasStopped;
+    }
+
+    /**
+     * Record the beginning of this session to SharedPreferences by
+     * recording our start time. If a session was already recorded, it is
+     * overwritten (there can only be one running session at a time). Does
+     * not commit the editor.
+     */
+    public void recordBegin(SharedPreferences.Editor editor) {
+        Log.d(LOG_TAG, "Recording start of session: " + this.wallStartTime);
+        editor.putLong(PREFS_SESSION_START, this.wallStartTime);
+    }
+
+    /**
+     * Record the completion of this session to SharedPreferences by
+     * deleting our start time. Does not commit the editor.
+     */
+    public void recordCompletion(SharedPreferences.Editor editor) {
+        Log.d(LOG_TAG, "Recording session done: " + this.wallStartTime);
+        editor.remove(PREFS_SESSION_START);
+    }
+
+    /**
+     * Return the JSON that we'll put in the DB for this session.
+     */
+    public JSONObject getCompletionJSON(String reason, long realEndTime) throws JSONException {
+        long durationSecs = (realEndTime - this.realStartTime) / 1000;
+        JSONObject out = new JSONObject();
+        out.put("r", reason);
+        out.put("d", durationSecs);
+        if (this.timedGeckoStartup > 0) {
+            out.put("sg", this.timedGeckoStartup);
+        }
+        if (this.timedJavaStartup > 0) {
+            out.put("sj", this.timedJavaStartup);
+        }
+        return out;
+    }
+
+    public JSONObject getCrashedJSON() throws JSONException {
+        JSONObject out = new JSONObject();
+        // We use ints here instead of booleans, because we're packing
+        // stuff into JSON, and saving bytes in the DB is a worthwhile
+        // goal.
+        out.put("oom", this.wasOOM ? 1 : 0);
+        out.put("stopped", this.wasStopped ? 1 : 0);
+        out.put("r", "A");
+        return out;
+    }
+
+    public void setTimedGeckoStartup(final long duration) {
+        timedGeckoStartup = duration;
+    }
+
+    public void setTimedJavaStartup(final long duration) {
+        timedJavaStartup = duration;
+    }
+}