8731408b11
There are a handful of core system services that collect data from third-party ContentProviders by spinning them up and then caching the results locally in memory. However, if those apps are killed due to low-memory pressure, they lose that cached data and have to collect it again from scratch. It's impossible for those apps to maintain a correct cache when not running, since they'll miss out on Uri change notifications. To work around this, this change introducing a narrowly-scoped caching mechanism that maps from Uris to Bundles. The cache is isolated per-user and per-calling-package, and internally it's optimized to keep the Uri notification flow as fast as possible. Each Bundle is invalidated whenever a notification event for a Uri key is sent, or when the package hosting the provider is changed. This change also wires up DocumentsUI to use this new mechanism, which improves cold-start performance from 3300ms to 1800ms. The more DocumentsProviders a system has, the more pronounced this benefit is. Use BOOT_COMPLETED to build the cache at boot. Add more permission docs, send a missing extra in DATA_CLEARED broadcast. Bug: 18406595 Change-Id: If3eae14bb3c69a8b83a65f530e081efc3b34d4bc
35 lines
1.2 KiB
Java
35 lines
1.2 KiB
Java
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.documentsui;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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/**
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* Prime {@link RootsCache} when the system is booted.
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*/
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public class BootReceiver extends BroadcastReceiver {
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@Override
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public void onReceive(Context context, Intent intent) {
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// We already spun up our application object before getting here, which
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// kicked off a task to load roots, so this broadcast is finished once
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// that first pass is done.
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DocumentsApplication.getRootsCache(context).setBootCompletedResult(goAsync());
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}
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}
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