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[SettingsProvider] set min and max of backing store number

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With this change, the number of users supported for caching will be
UserManager.getMaxSupportedUsers() + 2, but limited to be inside the
range of [3, 18].

BUG: 273617810
Test: atest GenerationRegistryTest
Change-Id: I61c477127068528947a93c9992e47ac79194850e
This commit is contained in:
Songchun Fan
2023-03-16 12:48:56 -07:00
parent 2b03be6c6d
commit 9e19df84f9
3 changed files with 44 additions and 15 deletions
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29
packages/SettingsProvider/src/com/android/providers/settings/GenerationRegistry.java
View File

@@ -50,10 +50,6 @@ final class GenerationRegistry {
@GuardedBy("mLock")
private final ArrayMap<Integer, ArrayMap<String, Integer>> mKeyToIndexMapMap = new ArrayMap<>();
@VisibleForTesting(visibility = VisibleForTesting.Visibility.PRIVATE)
// Maximum number of backing stores allowed
static final int NUM_MAX_BACKING_STORE = 8;
@GuardedBy("mLock")
private int mNumBackingStore = 0;
@@ -65,8 +61,24 @@ final class GenerationRegistry {
// The generation number is only increased when a new non-predefined setting is inserted
private static final String DEFAULT_MAP_KEY_FOR_UNSET_SETTINGS = "";
public GenerationRegistry(Object lock) {
@VisibleForTesting(visibility = VisibleForTesting.Visibility.PRIVATE)
// Minimum number of backing stores; supports 3 users
static final int MIN_NUM_BACKING_STORE = 8;
// Maximum number of backing stores; supports 18 users
static final int MAX_NUM_BACKING_STORE = 38;
private final int mMaxNumBackingStore;
GenerationRegistry(Object lock, int maxNumUsers) {
mLock = lock;
// Add some buffer to maxNumUsers to accommodate corner cases when the actual number of
// users in the system exceeds the limit
maxNumUsers = maxNumUsers + 2;
// Number of backing stores needed for N users is (N + N + 1 + 1) = N * 2 + 2
// N Secure backing stores and N System backing stores, 1 Config and 1 Global for all users
// However, we always make sure that at least 3 users and at most 18 users are supported.
mMaxNumBackingStore = Math.min(Math.max(maxNumUsers * 2 + 2, MIN_NUM_BACKING_STORE),
MAX_NUM_BACKING_STORE);
}
/**
@@ -195,7 +207,7 @@ final class GenerationRegistry {
}
if (backingStore == null) {
try {
if (mNumBackingStore >= NUM_MAX_BACKING_STORE) {
if (mNumBackingStore >= mMaxNumBackingStore) {
if (DEBUG) {
Slog.e(LOG_TAG, "Error creating backing store - at capacity");
}
@@ -275,4 +287,9 @@ final class GenerationRegistry {
}
return -1;
}
@VisibleForTesting(visibility = VisibleForTesting.Visibility.PRIVATE)
int getMaxNumBackingStores() {
return mMaxNumBackingStore;
}
}

2
packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java
View File

@@ -2831,7 +2831,7 @@ public class SettingsProvider extends ContentProvider {
public SettingsRegistry() {
mHandler = new MyHandler(getContext().getMainLooper());
mGenerationRegistry = new GenerationRegistry(mLock);
mGenerationRegistry = new GenerationRegistry(mLock, UserManager.getMaxSupportedUsers());
mBackupManager = new BackupManager(getContext());
}

28
packages/SettingsProvider/test/src/com/android/providers/settings/GenerationRegistryTest.java
View File

@@ -36,7 +36,7 @@ import java.io.IOException;
public class GenerationRegistryTest {
@Test
public void testGenerationsWithRegularSetting() throws IOException {
final GenerationRegistry generationRegistry = new GenerationRegistry(new Object());
final GenerationRegistry generationRegistry = new GenerationRegistry(new Object(), 2);
final int secureKey = SettingsState.makeKey(SettingsState.SETTINGS_TYPE_SECURE, 0);
final String testSecureSetting = "test_secure_setting";
Bundle b = new Bundle();
@@ -93,7 +93,7 @@ public class GenerationRegistryTest {
@Test
public void testGenerationsWithConfigSetting() throws IOException {
final GenerationRegistry generationRegistry = new GenerationRegistry(new Object());
final GenerationRegistry generationRegistry = new GenerationRegistry(new Object(), 1);
final String prefix = "test_namespace/";
final int configKey = SettingsState.makeKey(SettingsState.SETTINGS_TYPE_CONFIG, 0);
@@ -110,10 +110,10 @@ public class GenerationRegistryTest {
@Test
public void testMaxNumBackingStores() throws IOException {
final GenerationRegistry generationRegistry = new GenerationRegistry(new Object());
final GenerationRegistry generationRegistry = new GenerationRegistry(new Object(), 2);
final String testSecureSetting = "test_secure_setting";
Bundle b = new Bundle();
for (int i = 0; i < GenerationRegistry.NUM_MAX_BACKING_STORE; i++) {
for (int i = 0; i < generationRegistry.getMaxNumBackingStores(); i++) {
b.clear();
final int key = SettingsState.makeKey(SettingsState.SETTINGS_TYPE_SECURE, i);
generationRegistry.addGenerationData(b, key, testSecureSetting);
@@ -121,7 +121,7 @@ public class GenerationRegistryTest {
}
b.clear();
final int key = SettingsState.makeKey(SettingsState.SETTINGS_TYPE_SECURE,
GenerationRegistry.NUM_MAX_BACKING_STORE + 1);
generationRegistry.getMaxNumBackingStores() + 1);
generationRegistry.addGenerationData(b, key, testSecureSetting);
// Should fail to add generation because the number of backing stores has reached limit
checkBundle(b, -1, -1, true);
@@ -133,7 +133,7 @@ public class GenerationRegistryTest {
@Test
public void testMaxSizeBackingStore() throws IOException {
final GenerationRegistry generationRegistry = new GenerationRegistry(new Object());
final GenerationRegistry generationRegistry = new GenerationRegistry(new Object(), 1);
final int secureKey = SettingsState.makeKey(SettingsState.SETTINGS_TYPE_SECURE, 0);
final String testSecureSetting = "test_secure_setting";
Bundle b = new Bundle();
@@ -153,7 +153,7 @@ public class GenerationRegistryTest {
@Test
public void testUnsetSettings() throws IOException {
final GenerationRegistry generationRegistry = new GenerationRegistry(new Object());
final GenerationRegistry generationRegistry = new GenerationRegistry(new Object(), 1);
final int secureKey = SettingsState.makeKey(SettingsState.SETTINGS_TYPE_SECURE, 0);
final String testSecureSetting = "test_secure_setting";
Bundle b = new Bundle();
@@ -172,7 +172,7 @@ public class GenerationRegistryTest {
@Test
public void testGlobalSettings() throws IOException {
final GenerationRegistry generationRegistry = new GenerationRegistry(new Object());
final GenerationRegistry generationRegistry = new GenerationRegistry(new Object(), 2);
final int globalKey = SettingsState.makeKey(SettingsState.SETTINGS_TYPE_GLOBAL, 0);
final String testGlobalSetting = "test_global_setting";
final Bundle b = new Bundle();
@@ -188,6 +188,18 @@ public class GenerationRegistryTest {
assertThat(array).isEqualTo(array2);
}
@Test
public void testNumberOfBackingStores() {
GenerationRegistry generationRegistry = new GenerationRegistry(new Object(), 0);
// Test that the capacity of the backing stores is always valid
assertThat(generationRegistry.getMaxNumBackingStores()).isEqualTo(
GenerationRegistry.MIN_NUM_BACKING_STORE);
generationRegistry = new GenerationRegistry(new Object(), 100);
// Test that the capacity of the backing stores is always valid
assertThat(generationRegistry.getMaxNumBackingStores()).isEqualTo(
GenerationRegistry.MAX_NUM_BACKING_STORE);
}
private void checkBundle(Bundle b, int expectedIndex, int expectedGeneration, boolean isNull)
throws IOException {
final MemoryIntArray array = getArray(b);