Adding reusable version of IconCache and IconFactory

> Adding resource based allowing projects to control cache behavior
> Fixing missing comments from ag/5470467
> Adding support for no-immemory cache

Bug: 115891474
Change-Id: I691206805430cd93d3be78119bc249cefd79790a

2 files changed, 203 insertions, 0 deletions

diff --git a/iconloaderlib/src_full_lib/com/android/launcher3/icons/IconFactory.java b/iconloaderlib/src_full_lib/com/android/launcher3/icons/IconFactory.java
new file mode 100644
index 000000000..48f11fde3
--- /dev/null
+++ b/iconloaderlib/src_full_lib/com/android/launcher3/icons/IconFactory.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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.android.launcher3.icons;
+
+import android.content.Context;
+
+/**
+ * Wrapper class to provide access to {@link BaseIconFactory} and also to provide pool of this class
+ * that are threadsafe.
+ */
+public class IconFactory extends BaseIconFactory {
+
+    private static final Object sPoolSync = new Object();
+    private static IconFactory sPool;
+    private static int sPoolId = 0;
+
+    /**
+     * Return a new Message instance from the global pool. Allows us to
+     * avoid allocating new objects in many cases.
+     */
+    public static IconFactory obtain(Context context) {
+        int poolId;
+        synchronized (sPoolSync) {
+            if (sPool != null) {
+                IconFactory m = sPool;
+                sPool = m.next;
+                m.next = null;
+                return m;
+            }
+            poolId = sPoolId;
+        }
+
+        return new IconFactory(context,
+                context.getResources().getConfiguration().densityDpi,
+                context.getResources().getDimensionPixelSize(R.dimen.default_icon_bitmap_size),
+                poolId);
+    }
+
+    public static void clearPool() {
+        synchronized (sPoolSync) {
+            sPool = null;
+            sPoolId++;
+        }
+    }
+
+    private final int mPoolId;
+
+    private IconFactory next;
+
+    private IconFactory(Context context, int fillResIconDpi, int iconBitmapSize, int poolId) {
+        super(context, fillResIconDpi, iconBitmapSize);
+        mPoolId = poolId;
+    }
+
+    /**
+     * Recycles a LauncherIcons that may be in-use.
+     */
+    public void recycle() {
+        synchronized (sPoolSync) {
+            if (sPoolId != mPoolId) {
+                return;
+            }
+            // Clear any temporary state variables
+            clear();
+
+            next = sPool;
+            sPool = this;
+        }
+    }
+
+    @Override
+    public void close() {
+        recycle();
+    }
+}
diff --git a/iconloaderlib/src_full_lib/com/android/launcher3/icons/SimpleIconCache.java b/iconloaderlib/src_full_lib/com/android/launcher3/icons/SimpleIconCache.java
new file mode 100644
index 000000000..1337975f1
--- /dev/null
+++ b/iconloaderlib/src_full_lib/com/android/launcher3/icons/SimpleIconCache.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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.android.launcher3.icons;
+
+import static android.content.Intent.ACTION_MANAGED_PROFILE_ADDED;
+import static android.content.Intent.ACTION_MANAGED_PROFILE_REMOVED;
+
+import android.annotation.TargetApi;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.pm.ApplicationInfo;
+import android.os.Build;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.os.Looper;
+import android.os.UserHandle;
+import android.os.UserManager;
+import android.util.SparseLongArray;
+
+import com.android.launcher3.icons.cache.BaseIconCache;
+
+/**
+ * Wrapper class to provide access to {@link BaseIconFactory} and also to provide pool of this class
+ * that are threadsafe.
+ */
+@TargetApi(Build.VERSION_CODES.P)
+public class SimpleIconCache extends BaseIconCache {
+
+    private static SimpleIconCache sIconCache = null;
+    private static final Object CACHE_LOCK = new Object();
+
+    private final SparseLongArray mUserSerialMap = new SparseLongArray(2);
+    private final UserManager mUserManager;
+
+    public SimpleIconCache(Context context, String dbFileName, Looper bgLooper, int iconDpi,
+            int iconPixelSize, boolean inMemoryCache) {
+        super(context, dbFileName, bgLooper, iconDpi, iconPixelSize, inMemoryCache);
+        mUserManager = context.getSystemService(UserManager.class);
+
+        // Listen for user cache changes.
+        IntentFilter filter = new IntentFilter(ACTION_MANAGED_PROFILE_ADDED);
+        filter.addAction(ACTION_MANAGED_PROFILE_REMOVED);
+        context.registerReceiver(new BroadcastReceiver() {
+            @Override
+            public void onReceive(Context context, Intent intent) {
+                resetUserCache();
+            }
+        }, filter, null, new Handler(bgLooper), 0);
+    }
+
+    @Override
+    protected long getSerialNumberForUser(UserHandle user) {
+        synchronized (mUserSerialMap) {
+            int index = mUserSerialMap.indexOfKey(user.getIdentifier());
+            if (index >= 0) {
+                return mUserSerialMap.valueAt(index);
+            }
+            long serial = mUserManager.getSerialNumberForUser(user);
+            mUserSerialMap.put(user.getIdentifier(), serial);
+            return serial;
+        }
+    }
+
+    private void resetUserCache() {
+        synchronized (mUserSerialMap) {
+            mUserSerialMap.clear();
+        }
+    }
+
+    @Override
+    protected boolean isInstantApp(ApplicationInfo info) {
+        return info.isInstantApp();
+    }
+
+    @Override
+    protected BaseIconFactory getIconFactory() {
+        return IconFactory.obtain(mContext);
+    }
+
+    public static SimpleIconCache getIconCache(Context context) {
+        synchronized (CACHE_LOCK) {
+            if (sIconCache != null) {
+                return sIconCache;
+            }
+            boolean inMemoryCache =
+                    context.getResources().getBoolean(R.bool.simple_cache_enable_im_memory);
+            String dbFileName = context.getString(R.string.cache_db_name);
+
+            HandlerThread bgThread = new HandlerThread("simple-icon-cache");
+            bgThread.start();
+
+            sIconCache = new SimpleIconCache(context.getApplicationContext(), dbFileName,
+                    bgThread.getLooper(), context.getResources().getConfiguration().densityDpi,
+                    context.getResources().getDimensionPixelSize(R.dimen.default_icon_bitmap_size),
+                    inMemoryCache);
+            return sIconCache;
+        }
+    }
+}