Rollforward exposing cronet glide modules

PiperOrigin-RevId: 289954530

Author: sjudd

integration/cronet/src/main/AndroidManifest.xml

@@ -1,3 +1,8 @@
-<manifest package="com.bumptech.glide.integration.cronet">
-    <application />
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.bumptech.glide.integration.cronet">
+    <application>
+        <meta-data
+            android:name="com.bumptech.glide.integration.cronet.CronetGlideModule"
+            android:value="GlideModule" />
+    </application>
 </manifest>

integration/cronet/src/main/java/com/bumptech/glide/integration/cronet/CronetEngineSingleton.java

@@ -0,0 +1,42 @@
+package com.bumptech.glide.integration.cronet;
+
+import android.content.Context;
+import org.chromium.net.CronetEngine;
+
+/**
+ * Class controlling singleton instance of the CronetEngine. Ensures at most one instance of the
+ * CronetEngine is created.
+ */
+// NOTE: This is a standalone class and not a memoized supplier as the CronetEngine creations
+// requires a parameter, namedly a Context reference.
+public final class CronetEngineSingleton {
+
+  // non instantiable
+  private CronetEngineSingleton() {}
+
+  private static volatile CronetEngine cronetEngineSingleton;
+
+  public static CronetEngine getSingleton(Context context) {
+
+    // Lazily create the engine.
+    if (cronetEngineSingleton == null) {
+      synchronized (CronetEngineSingleton.class) {
+        // have to re-check since this might have changed before synchronization, but we don't
+        // want to synchronize just to check for null.
+        if (cronetEngineSingleton == null) {
+          cronetEngineSingleton = createEngine(context);
+        }
+      }
+    }
+
+    return cronetEngineSingleton;
+  }
+
+  private static CronetEngine createEngine(Context context) {
+    return new CronetEngine.Builder(context)
+        .enableHttpCache(CronetEngine.Builder.HTTP_CACHE_DISABLED, 0)
+        .enableHttp2(true)
+        .enableQuic(false)
+        .build();
+  }
+}

integration/cronet/src/main/java/com/bumptech/glide/integration/cronet/CronetGlideModule.java

@@ -0,0 +1,38 @@
+package com.bumptech.glide.integration.cronet;
+
+import android.content.Context;
+import com.bumptech.glide.Glide;
+import com.bumptech.glide.GlideBuilder;
+import com.bumptech.glide.Registry;
+import com.bumptech.glide.load.model.GlideUrl;
+import com.bumptech.glide.module.GlideModule;
+import com.google.common.base.Supplier;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import org.chromium.net.CronetEngine;
+
+/**
+ * A {@link GlideModule} that registers components allowing remote image fetching to be done using
+ * Cronet.
+ */
+public final class CronetGlideModule implements GlideModule {
+
+  @Override
+  public void applyOptions(Context context, GlideBuilder builder) {}
+
+  @Override
+  public void registerComponents(final Context context, Glide glide, Registry registry) {
+    CronetRequestFactory factory =
+        new CronetRequestFactoryImpl(
+            new Supplier<CronetEngine>() {
+              @Override
+              public CronetEngine get() {
+                return CronetEngineSingleton.getSingleton(context);
+              }
+            });
+    registry.replace(
+        GlideUrl.class, InputStream.class, new ChromiumUrlLoader.StreamFactory(factory, null));
+    registry.prepend(
+        GlideUrl.class, ByteBuffer.class, new ChromiumUrlLoader.ByteBufferFactory(factory, null));
+  }
+}

integration/cronet/src/main/java/com/bumptech/glide/integration/cronet/CronetLibraryGlideModule.java

@@ -0,0 +1,40 @@
+package com.bumptech.glide.integration.cronet;
+
+import android.content.Context;
+import androidx.annotation.NonNull;
+import com.bumptech.glide.Glide;
+import com.bumptech.glide.Registry;
+import com.bumptech.glide.annotation.GlideModule;
+import com.bumptech.glide.integration.cronet.ChromiumUrlLoader.ByteBufferFactory;
+import com.bumptech.glide.integration.cronet.ChromiumUrlLoader.StreamFactory;
+import com.bumptech.glide.load.model.GlideUrl;
+import com.bumptech.glide.module.LibraryGlideModule;
+import com.google.common.base.Supplier;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import org.chromium.net.CronetEngine;
+
+/**
+ * A {@link LibraryGlideModule} that registers components allowing remote image fetching to be done
+ * using Cronet.
+ */
+@GlideModule
+public final class CronetLibraryGlideModule extends LibraryGlideModule {
+
+  @Override
+  public void registerComponents(
+      final @NonNull Context context, @NonNull Glide glide, @NonNull Registry registry) {
+    CronetRequestFactory factory =
+        new CronetRequestFactoryImpl(
+            new Supplier<CronetEngine>() {
+              @Override
+              public CronetEngine get() {
+                return CronetEngineSingleton.getSingleton(context);
+              }
+            });
+    registry.replace(
+        GlideUrl.class, InputStream.class, new StreamFactory(factory, null /* dataLogger */));
+    registry.prepend(
+        GlideUrl.class, ByteBuffer.class, new ByteBufferFactory(factory, null /* dataLogger */));
+  }
+}