import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

mobile/android/thirdparty/com/squareup/picasso/Stats.java

@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2013 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.squareup.picasso;
+
+import android.graphics.Bitmap;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.os.Looper;
+import android.os.Message;
+
+import static android.os.Process.THREAD_PRIORITY_BACKGROUND;
+
+class Stats {
+  private static final int CACHE_HIT = 0;
+  private static final int CACHE_MISS = 1;
+  private static final int BITMAP_DECODE_FINISHED = 2;
+  private static final int BITMAP_TRANSFORMED_FINISHED = 3;
+
+  private static final String STATS_THREAD_NAME = Utils.THREAD_PREFIX + "Stats";
+
+  final HandlerThread statsThread;
+  final Cache cache;
+  final Handler handler;
+
+  long cacheHits;
+  long cacheMisses;
+  long totalOriginalBitmapSize;
+  long totalTransformedBitmapSize;
+  long averageOriginalBitmapSize;
+  long averageTransformedBitmapSize;
+  int originalBitmapCount;
+  int transformedBitmapCount;
+
+  Stats(Cache cache) {
+    this.cache = cache;
+    this.statsThread = new HandlerThread(STATS_THREAD_NAME, THREAD_PRIORITY_BACKGROUND);
+    this.statsThread.start();
+    this.handler = new StatsHandler(statsThread.getLooper(), this);
+  }
+
+  void dispatchBitmapDecoded(Bitmap bitmap) {
+    processBitmap(bitmap, BITMAP_DECODE_FINISHED);
+  }
+
+  void dispatchBitmapTransformed(Bitmap bitmap) {
+    processBitmap(bitmap, BITMAP_TRANSFORMED_FINISHED);
+  }
+
+  void dispatchCacheHit() {
+    handler.sendEmptyMessage(CACHE_HIT);
+  }
+
+  void dispatchCacheMiss() {
+    handler.sendEmptyMessage(CACHE_MISS);
+  }
+
+  void shutdown() {
+    statsThread.quit();
+  }
+
+  void performCacheHit() {
+    cacheHits++;
+  }
+
+  void performCacheMiss() {
+    cacheMisses++;
+  }
+
+  void performBitmapDecoded(long size) {
+    originalBitmapCount++;
+    totalOriginalBitmapSize += size;
+    averageOriginalBitmapSize = getAverage(originalBitmapCount, totalOriginalBitmapSize);
+  }
+
+  void performBitmapTransformed(long size) {
+    transformedBitmapCount++;
+    totalTransformedBitmapSize += size;
+    averageTransformedBitmapSize = getAverage(originalBitmapCount, totalTransformedBitmapSize);
+  }
+
+  synchronized StatsSnapshot createSnapshot() {
+    return new StatsSnapshot(cache.maxSize(), cache.size(), cacheHits, cacheMisses,
+        totalOriginalBitmapSize, totalTransformedBitmapSize, averageOriginalBitmapSize,
+        averageTransformedBitmapSize, originalBitmapCount, transformedBitmapCount,
+        System.currentTimeMillis());
+  }
+
+  private void processBitmap(Bitmap bitmap, int what) {
+    // Never send bitmaps to the handler as they could be recycled before we process them.
+    int bitmapSize = Utils.getBitmapBytes(bitmap);
+    handler.sendMessage(handler.obtainMessage(what, bitmapSize, 0));
+  }
+
+  private static long getAverage(int count, long totalSize) {
+    return totalSize / count;
+  }
+
+  private static class StatsHandler extends Handler {
+
+    private final Stats stats;
+
+    public StatsHandler(Looper looper, Stats stats) {
+      super(looper);
+      this.stats = stats;
+    }
+
+    @Override public void handleMessage(final Message msg) {
+      switch (msg.what) {
+        case CACHE_HIT:
+          stats.performCacheHit();
+          break;
+        case CACHE_MISS:
+          stats.performCacheMiss();
+          break;
+        case BITMAP_DECODE_FINISHED:
+          stats.performBitmapDecoded(msg.arg1);
+          break;
+        case BITMAP_TRANSFORMED_FINISHED:
+          stats.performBitmapTransformed(msg.arg1);
+          break;
+        default:
+          Picasso.HANDLER.post(new Runnable() {
+            @Override public void run() {
+              throw new AssertionError("Unhandled stats message." + msg.what);
+            }
+          });
+      }
+    }
+  }
+}