116 lines
3.9 KiB
Java
116 lines
3.9 KiB
Java
/*
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* Copyright (C) 2019 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.internal.os;
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import android.os.SystemProperties;
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import android.provider.DeviceConfig;
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/**
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* Flag names for configuring the zygote.
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*
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* @hide
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*/
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public class ZygoteConfig {
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/** If {@code true}, enables the unspecialized app process (USAP) pool feature */
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public static final String USAP_POOL_ENABLED = "usap_pool_enabled";
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/**
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* The default value for enabling the unspecialized app process (USAP) pool. This value will
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* not be used if the devices has a DeviceConfig profile pushed to it that contains a value for
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* this key or if the System Property dalvik.vm.usap_pool_enabled is set.
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*/
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public static final boolean USAP_POOL_ENABLED_DEFAULT = false;
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/** The threshold used to determine if the pool should be refilled */
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public static final String USAP_POOL_REFILL_THRESHOLD = "usap_refill_threshold";
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public static final int USAP_POOL_REFILL_THRESHOLD_DEFAULT = 1;
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/** The maximum number of processes to keep in the USAP pool */
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public static final String USAP_POOL_SIZE_MAX = "usap_pool_size_max";
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public static final int USAP_POOL_SIZE_MAX_DEFAULT = 3;
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/**
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* The maximim value that will be accepted from the USAP_POOL_SIZE_MAX device property.
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* is a mirror of USAP_POOL_MAX_LIMIT found in com_android_internal_os_Zygote.cpp.
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*/
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public static final int USAP_POOL_SIZE_MAX_LIMIT = 100;
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/** The minimum number of processes to keep in the USAP pool */
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public static final String USAP_POOL_SIZE_MIN = "usap_pool_size_min";
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public static final int USAP_POOL_SIZE_MIN_DEFAULT = 1;
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/**
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* The minimum value that will be accepted from the USAP_POOL_SIZE_MIN device property.
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*/
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public static final int USAP_POOL_SIZE_MIN_LIMIT = 1;
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/** The number of milliseconds to delay before refilling the USAP pool */
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public static final String USAP_POOL_REFILL_DELAY_MS = "usap_pool_refill_delay_ms";
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public static final int USAP_POOL_REFILL_DELAY_MS_DEFAULT = 3000;
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public static final String PROPERTY_PREFIX_DEVICE_CONFIG = "persist.device_config";
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public static final String PROPERTY_PREFIX_SYSTEM = "dalvik.vm.";
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private static String getDeviceConfig(String name) {
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return SystemProperties.get(
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String.join(
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".",
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PROPERTY_PREFIX_DEVICE_CONFIG,
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DeviceConfig.NAMESPACE_RUNTIME_NATIVE,
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name));
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}
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/**
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* Get a property value from SystemProperties and convert it to an integer value.
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*/
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public static int getInt(String name, int defaultValue) {
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final String propString = getDeviceConfig(name);
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if (!propString.isEmpty()) {
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return Integer.parseInt(propString);
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} else {
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return SystemProperties.getInt(PROPERTY_PREFIX_SYSTEM + name, defaultValue);
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}
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}
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/**
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* Get a property value from SystemProperties and convert it to a Boolean value.
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*/
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public static boolean getBool(String name, boolean defaultValue) {
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final String propString = getDeviceConfig(name);
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if (!propString.isEmpty()) {
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return Boolean.parseBoolean(propString);
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} else {
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return SystemProperties.getBoolean(PROPERTY_PREFIX_SYSTEM + name, defaultValue);
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}
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}
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}
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