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Tidy ups from prior code reviews

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Switch to new(ish) Set.of() for construction of an immutable Set from an
array of elements. Update ServerFlags to be more explicit about lookup
behavior.

Bug: 197624972
Test: Build only
Change-Id: Ib86ffabf6b2ab47d89bda2cadb345eb9fdd42dbf
This commit is contained in:
Neil Fuller
2021-11-17 13:07:11 +00:00
parent 154e4da68d
commit b562e7e7ac
3 changed files with 51 additions and 38 deletions
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34
services/core/java/com/android/server/timedetector/ServerFlags.java
View File

@@ -35,6 +35,7 @@ import java.lang.annotation.Target;
import java.time.DateTimeException;
import java.time.Duration;
import java.time.Instant;
import java.util.HashSet;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
@@ -179,8 +180,13 @@ public final class ServerFlags {
public static final @DeviceConfigKey String KEY_ENHANCED_METRICS_COLLECTION_ENABLED =
"enhanced_metrics_collection_enabled";
/**
* The registered listeners and the keys to trigger on. The value is explicitly a HashSet to
* ensure O(1) lookup performance when working out whether a listener should trigger.
*/
@GuardedBy("mListeners")
private final ArrayMap<ConfigurationChangeListener, Set<String>> mListeners = new ArrayMap<>();
private final ArrayMap<ConfigurationChangeListener, HashSet<String>> mListeners =
new ArrayMap<>();
private static final Object SLOCK = new Object();
@@ -207,18 +213,29 @@ public final class ServerFlags {
private void handlePropertiesChanged(@NonNull DeviceConfig.Properties properties) {
synchronized (mListeners) {
for (Map.Entry<ConfigurationChangeListener, Set<String>> listenerEntry
for (Map.Entry<ConfigurationChangeListener, HashSet<String>> listenerEntry
: mListeners.entrySet()) {
if (intersects(listenerEntry.getValue(), properties.getKeyset())) {
// It's unclear which set of the following two Sets is going to be larger in the
// average case: monitoredKeys will be a subset of the set of possible keys, but
// only changed keys are reported. Because we guarantee the type / lookup behavior
// of the monitoredKeys by making that a HashSet, that is used as the haystack Set,
// while the changed keys is treated as the needles Iterable. At the time of
// writing, properties.getKeyset() actually returns a HashSet, so iteration isn't
// super efficient and the use of HashSet for monitoredKeys may be redundant, but
// neither set will be enormous.
HashSet<String> monitoredKeys = listenerEntry.getValue();
Iterable<String> modifiedKeys = properties.getKeyset();
if (containsAny(monitoredKeys, modifiedKeys)) {
listenerEntry.getKey().onChange();
}
}
}
}
private static boolean intersects(@NonNull Set<String> one, @NonNull Set<String> two) {
for (String toFind : one) {
if (two.contains(toFind)) {
private static boolean containsAny(
@NonNull Set<String> haystack, @NonNull Iterable<String> needles) {
for (String needle : needles) {
if (haystack.contains(needle)) {
return true;
}
}
@@ -237,8 +254,11 @@ public final class ServerFlags {
Objects.requireNonNull(listener);
Objects.requireNonNull(keys);
// Make a defensive copy and use a well-defined Set implementation to provide predictable
// performance on the lookup.
HashSet<String> keysCopy = new HashSet<>(keys);
synchronized (mListeners) {
mListeners.put(listener, keys);
mListeners.put(listener, keysCopy);
}
}

11
services/core/java/com/android/server/timedetector/ServiceConfigAccessor.java
View File

@@ -25,7 +25,6 @@ import android.annotation.Nullable;
import android.content.Context;
import android.os.Build;
import android.os.SystemProperties;
import android.util.ArraySet;
import com.android.internal.R;
import com.android.internal.annotations.GuardedBy;
@@ -35,7 +34,6 @@ import com.android.server.timezonedetector.ConfigurationChangeListener;
import java.time.Instant;
import java.util.Arrays;
import java.util.Collections;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
@@ -65,11 +63,10 @@ final class ServiceConfigAccessor {
Long.max(android.os.Environment.getRootDirectory().lastModified(), Build.TIME));
/** Device config keys that affect the {@link TimeDetectorService}. */
private static final Set<String> SERVER_FLAGS_KEYS_TO_WATCH = Collections.unmodifiableSet(
new ArraySet<>(new String[] {
KEY_TIME_DETECTOR_LOWER_BOUND_MILLIS_OVERRIDE,
KEY_TIME_DETECTOR_ORIGIN_PRIORITIES_OVERRIDE,
}));
private static final Set<String> SERVER_FLAGS_KEYS_TO_WATCH = Set.of(
KEY_TIME_DETECTOR_LOWER_BOUND_MILLIS_OVERRIDE,
KEY_TIME_DETECTOR_ORIGIN_PRIORITIES_OVERRIDE
);
private static final Object SLOCK = new Object();

44
services/core/java/com/android/server/timezonedetector/ServiceConfigAccessorImpl.java
View File

@@ -36,7 +36,6 @@ import android.location.LocationManager;
import android.os.UserHandle;
import android.os.UserManager;
import android.provider.Settings;
import android.util.ArraySet;
import com.android.internal.R;
import com.android.internal.annotations.GuardedBy;
@@ -45,7 +44,6 @@ import com.android.server.timedetector.ServerFlags;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
@@ -59,33 +57,31 @@ public final class ServiceConfigAccessorImpl implements ServiceConfigAccessor {
/**
* Device config keys that can affect the content of {@link ConfigurationInternal}.
*/
private static final Set<String> CONFIGURATION_INTERNAL_SERVER_FLAGS_KEYS_TO_WATCH =
Collections.unmodifiableSet(new ArraySet<>(new String[] {
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_FEATURE_SUPPORTED,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_RUN_IN_BACKGROUND_ENABLED,
ServerFlags.KEY_ENHANCED_METRICS_COLLECTION_ENABLED,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_SETTING_ENABLED_DEFAULT,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_SETTING_ENABLED_OVERRIDE,
ServerFlags.KEY_TIME_ZONE_DETECTOR_TELEPHONY_FALLBACK_SUPPORTED,
}));
private static final Set<String> CONFIGURATION_INTERNAL_SERVER_FLAGS_KEYS_TO_WATCH = Set.of(
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_FEATURE_SUPPORTED,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_RUN_IN_BACKGROUND_ENABLED,
ServerFlags.KEY_ENHANCED_METRICS_COLLECTION_ENABLED,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_SETTING_ENABLED_DEFAULT,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_SETTING_ENABLED_OVERRIDE,
ServerFlags.KEY_TIME_ZONE_DETECTOR_TELEPHONY_FALLBACK_SUPPORTED
);
/**
* Device config keys that can affect {@link
* com.android.server.timezonedetector.location.LocationTimeZoneManagerService} behavior.
*/
private static final Set<String> LOCATION_TIME_ZONE_MANAGER_SERVER_FLAGS_KEYS_TO_WATCH =
Collections.unmodifiableSet(new ArraySet<>(new String[] {
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_FEATURE_SUPPORTED,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_RUN_IN_BACKGROUND_ENABLED,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_SETTING_ENABLED_DEFAULT,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_SETTING_ENABLED_OVERRIDE,
ServerFlags.KEY_PRIMARY_LTZP_MODE_OVERRIDE,
ServerFlags.KEY_SECONDARY_LTZP_MODE_OVERRIDE,
ServerFlags.KEY_LTZP_INITIALIZATION_TIMEOUT_MILLIS,
ServerFlags.KEY_LTZP_INITIALIZATION_TIMEOUT_FUZZ_MILLIS,
ServerFlags.KEY_LTZP_EVENT_FILTERING_AGE_THRESHOLD_MILLIS,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_UNCERTAINTY_DELAY_MILLIS
}));
private static final Set<String> LOCATION_TIME_ZONE_MANAGER_SERVER_FLAGS_KEYS_TO_WATCH = Set.of(
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_FEATURE_SUPPORTED,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_RUN_IN_BACKGROUND_ENABLED,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_SETTING_ENABLED_DEFAULT,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_SETTING_ENABLED_OVERRIDE,
ServerFlags.KEY_PRIMARY_LTZP_MODE_OVERRIDE,
ServerFlags.KEY_SECONDARY_LTZP_MODE_OVERRIDE,
ServerFlags.KEY_LTZP_INITIALIZATION_TIMEOUT_MILLIS,
ServerFlags.KEY_LTZP_INITIALIZATION_TIMEOUT_FUZZ_MILLIS,
ServerFlags.KEY_LTZP_EVENT_FILTERING_AGE_THRESHOLD_MILLIS,
ServerFlags.KEY_LOCATION_TIME_ZONE_DETECTION_UNCERTAINTY_DELAY_MILLIS
);
private static final Duration DEFAULT_LTZP_INITIALIZATION_TIMEOUT = Duration.ofMinutes(5);
private static final Duration DEFAULT_LTZP_INITIALIZATION_TIMEOUT_FUZZ = Duration.ofMinutes(1);