android_webview/java/src/org/chromium/android_webview/AwBrowserContext.java

// Copyright 2013 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.content.SharedPreferences;

import org.chromium.base.memory.MemoryPressureMonitor;
import org.chromium.content_public.browser.ContentViewStatics;

/**
 * Java side of the Browser Context: contains all the java side objects needed to host one
 * browing session (i.e. profile).
 *
 * Note that historically WebView was running in single process mode, and limitations on renderer
 * process only being able to use a single browser context, currently there can only be one
 * AwBrowserContext instance, so at this point the class mostly exists for conceptual clarity.
 */
public class AwBrowserContext {
    private static final String TAG = "AwBrowserContext";
    private final SharedPreferences mSharedPreferences;

    private AwGeolocationPermissions mGeolocationPermissions;
    private AwFormDatabase mFormDatabase;
    private AwServiceWorkerController mServiceWorkerController;
    private AwTracingController mTracingController;
    private Context mApplicationContext;

    public AwBrowserContext(SharedPreferences sharedPreferences, Context applicationContext) {
        mSharedPreferences = sharedPreferences;
        mApplicationContext = applicationContext;

        PlatformServiceBridge.getInstance().setSafeBrowsingHandler();

        // Register MemoryPressureMonitor callbacks and make sure it polls only if there is at
        // least one WebView around.
        MemoryPressureMonitor.INSTANCE.registerComponentCallbacks();
        AwContentsLifecycleNotifier.addObserver(new AwContentsLifecycleNotifier.Observer() {
            @Override
            public void onFirstWebViewCreated() {
                MemoryPressureMonitor.INSTANCE.enablePolling();
            }
            @Override
            public void onLastWebViewDestroyed() {
                MemoryPressureMonitor.INSTANCE.disablePolling();
            }
        });
    }

    public AwGeolocationPermissions getGeolocationPermissions() {
        if (mGeolocationPermissions == null) {
            mGeolocationPermissions = new AwGeolocationPermissions(mSharedPreferences);
        }
        return mGeolocationPermissions;
    }

    public AwFormDatabase getFormDatabase() {
        if (mFormDatabase == null) {
            mFormDatabase = new AwFormDatabase();
        }
        return mFormDatabase;
    }

    public AwServiceWorkerController getServiceWorkerController() {
        if (mServiceWorkerController == null) {
            mServiceWorkerController = new AwServiceWorkerController(mApplicationContext, this);
        }
        return mServiceWorkerController;
    }

    public AwTracingController getTracingController() {
        if (mTracingController == null) {
            mTracingController = new AwTracingController();
        }
        return mTracingController;
    }

    /**
     * @see android.webkit.WebView#pauseTimers()
     */
    public void pauseTimers() {
        ContentViewStatics.setWebKitSharedTimersSuspended(true);
    }

    /**
     * @see android.webkit.WebView#resumeTimers()
     */
    public void resumeTimers() {
        ContentViewStatics.setWebKitSharedTimersSuspended(false);
    }
}