WebView Metrics client implementation (Chromium part)

android_webview/java/src/org/chromium/android_webview/AwMetricsServiceClient.java

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.android_webview;
+
+import android.content.Context;
+import android.webkit.ValueCallback;
+
+import org.chromium.base.Log;
+import org.chromium.base.annotations.JNINamespace;
+
+import java.lang.reflect.InvocationTargetException;
+
+/**
+ * Java twin of the homonymous C++ class. The Java side is only responsible for
+ * switching metrics on and off. Since the setting is a platform feature, it
+ * must be obtained through PlatformServiceBridge.
+ */
+@JNINamespace("android_webview")
+public class AwMetricsServiceClient {
+    private static final String TAG = "AwMetricsServiceCli-";

[sgurun-gerrit only, 2015/12/11 00:06:45]

"AwMetricsServiceClient"

[paulmiller, 2015/12/18 00:15:49]

I'd prefer that too, but there's a length limit.

+    private static final String GMAIL = "com.google.android.gm";

[sgurun-gerrit only, 2015/12/11 00:06:46]

let's move this logic to the bridge

[paulmiller, 2015/12/18 00:15:49]

Are you sure? The Gmail detection is specific to Metrics.

+    private static final String PLATFORM_SERVICE_BRIDGE =
+            "com.android.webview.chromium.PlatformServiceBridgeGoogle";
+
+    private PlatformServiceBridge mPlatformServiceBridge;
+
+    public AwMetricsServiceClient(Context applicationContext) {
+        mPlatformServiceBridge = getPlatformServiceBridge(applicationContext);
+
+        mPlatformServiceBridge.setMetricsSettingListener(new ValueCallback<Boolean>() {
+            public void onReceiveValue(Boolean enabled) {
+                nativeSetMetricsEnabled(enabled.booleanValue());
+            }
+        });
+    }
+
+    private static PlatformServiceBridge getPlatformServiceBridge(Context applicationContext) {
+        // If this is gmail, try to get the Google service bridge.
+        if (GMAIL.equals(applicationContext.getPackageName())) {

[sgurun-gerrit only, 2015/12/11 00:06:46]

same, move this to the bridge.

+            try {
+                Class<?> cls = Class.forName(PLATFORM_SERVICE_BRIDGE);
+                return (PlatformServiceBridge) cls.getDeclaredConstructor(Context.class)
+                        .newInstance(applicationContext);
+            } catch (InvocationTargetException e) {
+                Log.e(TAG, "Failed to get " + PLATFORM_SERVICE_BRIDGE + " (invocation):",

[sgurun-gerrit only, 2015/12/11 00:06:46]

not an error. This is actually a reasonable state for AOSP webview. Log.i

[paulmiller, 2015/12/18 00:15:50]

I think that'll actually be a ClassNotFoundException.

+                        e.getCause());
+            } catch (Exception e) {

[sgurun-gerrit only, 2015/12/11 00:06:45]

I don't think you can put a blanket exception here. Need to specialize. (I think
findbugs will barf)

[paulmiller, 2015/12/18 00:15:49]

fixed

+                Log.e(TAG, "Failed to get " + PLATFORM_SERVICE_BRIDGE + ":", e);

[sgurun-gerrit only, 2015/12/11 00:06:46]

rather than repeating the Log.e, use a boolean to indicate fail state and log if
it failed.

[paulmiller, 2015/12/18 00:15:49]

But I want to log InvocationTargetException differently by calling getCause,
because InvocationTargetException otherwise gives no useful information.

+            }
+        }
+
+        // If this is not gmail or getting the preferred service
+        // bridge failed, get the generic service bridge.

[sgurun-gerrit only, 2015/12/11 00:06:46]

remove the gmail comment.

[paulmiller, 2015/12/18 00:15:49]

fixed

+        return new PlatformServiceBridge();
+    }
+
+    public static native void nativeSetMetricsEnabled(boolean enabled);
+}