107 lines
4.3 KiB
Java
107 lines
4.3 KiB
Java
/*
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* Copyright (C) 2020 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.i18n.system;
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import android.compat.Compatibility;
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import android.compat.annotation.ChangeId;
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import android.compat.annotation.EnabledAfter;
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import android.icu.impl.ZoneMeta;
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import android.icu.platform.AndroidDataFiles;
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import android.icu.impl.CacheValue;
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import android.icu.text.DateFormatSymbols;
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import android.icu.text.DecimalFormatSymbols;
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import android.icu.util.TimeZone;
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import android.icu.util.ULocale;
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import dalvik.annotation.compat.VersionCodes;
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/**
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* Provides hooks for {@link dalvik.system.ZygoteHooks} to call into this class to initialize
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* in the Zygote.
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*
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* @hide
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*/
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@libcore.api.IntraCoreApi
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public final class ZygoteHooks {
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/** All methods are static, no need to instantiate. */
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private ZygoteHooks() {
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}
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/**
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* Called when the Zygote begins preloading classes and data.
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* It caches some ICU objects before the Zygote forks, and tune some behaviors during preload,
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* e.g. enabling strong cache for preloaded classes.
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*/
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@libcore.api.IntraCoreApi
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public static void onBeginPreload() {
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// Pin ICU data in memory from this point that would normally be held by soft references.
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// Without this, any references created immediately below or during class preloading
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// would be collected when the Zygote GC runs in gcAndFinalize().
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CacheValue.setStrength(CacheValue.Strength.STRONG);
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// Explicitly exercise code to cache data apps/framework are likely to need.
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ULocale[] localesToPin = { ULocale.ROOT, ULocale.US, ULocale.getDefault() };
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for (ULocale uLocale : localesToPin) {
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new DecimalFormatSymbols(uLocale);
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new DateFormatSymbols(uLocale);
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}
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// Framework's LocalLog is used during app start-up. It indirectly uses the current ICU time
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// zone. Pre-loading the current time zone in ICU improves app startup time. b/150605074
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TimeZone.getDefault();
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// Preload the String[] ZoneMeta#ZONEIDS. See http://b/73282298
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ZoneMeta.getAvailableIDs(TimeZone.SystemTimeZoneType.ANY, null, null);
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}
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/**
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* Called when the Zygote has completed preloading classes and data.
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*/
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@libcore.api.IntraCoreApi
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public static void onEndPreload() {
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// All cache references created by ICU from this point will be soft.
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CacheValue.setStrength(CacheValue.Strength.SOFT);
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// The PROP_ICUBINARY_DATA_PATH property was used on Android before S to configure its copy
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// of ICU4J before the ART module was split out. ICU4J on Android now carries a patch so the
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// system property is not needed. It is still set as a System property and it is cleared in
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// disableCompatChangesBeforeAppStart() after forking, if android.compat.Compatibility
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// allow.
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// It's in the end of preload because preload and ICU4J initialization should succeed
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// without this property. Otherwise, it indicates that the Android patch is not working.
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System.setProperty(PROP_ICUBINARY_DATA_PATH, AndroidDataFiles.generateIcuDataPath());
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}
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/**
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* Remove "android.icu.impl.ICUBinary.dataPath" property for apps targeting S+. The ICU data
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* path should not visible to the apps.
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*/
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@ChangeId
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@EnabledAfter(targetSdkVersion = VersionCodes.R)
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private static final long HIDE_PROP_ICUBINARY_DATA_PATH = 171979766L; // This is a bug id.
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// VisibleForTesting
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public static final String PROP_ICUBINARY_DATA_PATH = "android.icu.impl.ICUBinary.dataPath";
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static void handleCompatChangesBeforeBindingApplication() {
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if (Compatibility.isChangeEnabled(HIDE_PROP_ICUBINARY_DATA_PATH)) {
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System.clearProperty(PROP_ICUBINARY_DATA_PATH);
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}
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}
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}
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