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DataStoreFactory

public static class DataStoreFactory

Public factory for creating DataStore instances.

Summary

Public fields
@NonNull DataStoreFactory

Public methods
final @NonNull DataStore<@NonNull T>
<T extends Object> create(
    @NonNull Storage<@NonNull T> storage,
    ReplaceFileCorruptionHandler<@NonNull T> corruptionHandler,
    @NonNull List<@NonNull DataMigration<@NonNull T>> migrations,
    @NonNull CoroutineScope scope
)
final @NonNull DataStore<@NonNull T>
<T extends Object> create(
    @NonNull Serializer<@NonNull T> serializer,
    ReplaceFileCorruptionHandler<@NonNull T> corruptionHandler,
    @NonNull List<@NonNull DataMigration<@NonNull T>> migrations,
    @NonNull CoroutineScope scope,
    @NonNull Function0<@NonNull File> produceFile
)

Create an instance of SingleProcessDataStore.
final @NonNull DataStore<@NonNull T>
<T extends Object> create(
    @NonNull Serializer<@NonNull T> serializer,
    ReplaceFileCorruptionHandler<@NonNull T> corruptionHandler,
    @NonNull List<@NonNull DataMigration<@NonNull T>> migrations,
    @NonNull CoroutineScope scope,
    @NonNull Function0<@NonNull File> produceFile
)

Create an instance of SingleProcessDataStore.
final @NonNull DataStore<@NonNull T>
@RequiresApi(value = 24)
<T extends Object> createInDeviceProtectedStorage(
    @NonNull Context context,
    @NonNull String fileName,
    @NonNull Serializer<@NonNull T> serializer,
    ReplaceFileCorruptionHandler<@NonNull T> corruptionHandler,
    @NonNull List<@NonNull DataMigration<@NonNull T>> migrations,
    @NonNull CoroutineScope scope
)

Create an instance of SingleProcessDataStore that can be used during direct boot.
final @NonNull DataStore<@NonNull T>
<T extends Object> createWithTracing(
    @NonNull Storage<@NonNull T> storage,
    @NonNull Tracer tracer,
    @NonNull CorruptionHandler<@NonNull T> corruptionHandler,
    @NonNull List<@NonNull DataMigration<@NonNull T>> migrations,
    @NonNull CoroutineScope scope
)

Create an instance of SingleProcessDataStore with tracing enabled.

Public fields

INSTANCE

Added in 1.0.0
public @NonNull DataStoreFactory INSTANCE

Public methods

create

public final @NonNull DataStore<@NonNull T> <T extends Object> create(
    @NonNull Storage<@NonNull T> storage,
    ReplaceFileCorruptionHandler<@NonNull T> corruptionHandler,
    @NonNull List<@NonNull DataMigration<@NonNull T>> migrations,
    @NonNull CoroutineScope scope
)

create

public final @NonNull DataStore<@NonNull T> <T extends Object> create(
    @NonNull Serializer<@NonNull T> serializer,
    ReplaceFileCorruptionHandler<@NonNull T> corruptionHandler,
    @NonNull List<@NonNull DataMigration<@NonNull T>> migrations,
    @NonNull CoroutineScope scope,
    @NonNull Function0<@NonNull File> produceFile
)

Create an instance of SingleProcessDataStore. Never create more than one instance of DataStore for a given file; doing so can break all DataStore functionality. You should consider managing your DataStore instance as a singleton. If there are multiple DataStores active, DataStore will throw IllegalStateException when reading or updating data. A DataStore is considered active as long as its scope is active.

T is the type DataStore acts on. The type T must be immutable. Mutating a type used in DataStore invalidates any guarantees that DataStore provides and will result in potentially serious, hard-to-catch bugs. We strongly recommend using protocol buffers: https://developers.google.com/protocol-buffers/docs/javatutorial - which provides immutability guarantees, a simple API and efficient serialization.

It is important to note that if a produceFile lambda to produce a file in the User Encrypted (UE) storage via a Context is used, this file will not be available during direct boot, and may result in a DirectBootUsageException via a java.io.FileNotFoundException or a silent failure. To create an instance of a DataStore to be used safely during direct boot mode, please use createInDeviceProtectedStorage.

Parameters
@NonNull Serializer<@NonNull T> serializer

Serializer for the type T used with DataStore. The type T must be immutable.
ReplaceFileCorruptionHandler<@NonNull T> corruptionHandler

The corruptionHandler is invoked if DataStore encounters a CorruptionException when attempting to read data. CorruptionExceptions are thrown by serializers when data can not be de-serialized.
@NonNull List<@NonNull DataMigration<@NonNull T>> migrations

Migrations are run before any access to data can occur. Migrations must be idempotent.
@NonNull CoroutineScope scope

The scope in which IO operations and transform functions will execute.
@NonNull Function0<@NonNull File> produceFile

Function which returns the file that the new DataStore will act on. The function must return the same path every time. No two instances of DataStore should act on the same file at the same time.
Returns
@NonNull DataStore<@NonNull T>

a new DataStore instance with the provided configuration

create

public final @NonNull DataStore<@NonNull T> <T extends Object> create(
    @NonNull Serializer<@NonNull T> serializer,
    ReplaceFileCorruptionHandler<@NonNull T> corruptionHandler,
    @NonNull List<@NonNull DataMigration<@NonNull T>> migrations,
    @NonNull CoroutineScope scope,
    @NonNull Function0<@NonNull File> produceFile
)

Create an instance of SingleProcessDataStore. Never create more than one instance of DataStore for a given file; doing so can break all DataStore functionality. You should consider managing your DataStore instance as a singleton. If there are multiple DataStores active, DataStore will throw IllegalStateException when reading or updating data. A DataStore is considered active as long as its scope is active.

T is the type DataStore acts on. The type T must be immutable. Mutating a type used in DataStore invalidates any guarantees that DataStore provides and will result in potentially serious, hard-to-catch bugs. We strongly recommend using protocol buffers: https://developers.google.com/protocol-buffers/docs/javatutorial - which provides immutability guarantees, a simple API and efficient serialization.

Parameters
@NonNull Serializer<@NonNull T> serializer

Serializer for the type T used with DataStore. The type T must be immutable.
ReplaceFileCorruptionHandler<@NonNull T> corruptionHandler

The corruptionHandler is invoked if DataStore encounters a CorruptionException when attempting to read data. CorruptionExceptions are thrown by serializers when data can not be de-serialized.
@NonNull List<@NonNull DataMigration<@NonNull T>> migrations

Migrations are run before any access to data can occur. Migrations must be idempotent.
@NonNull CoroutineScope scope

The scope in which IO operations and transform functions will execute.
@NonNull Function0<@NonNull File> produceFile

Function which returns the file that the new DataStore will act on. The function must return the same path every time. No two instances of DataStore should act on the same file at the same time.
Returns
@NonNull DataStore<@NonNull T>

a new DataStore instance with the provided configuration

createInDeviceProtectedStorage

@RequiresApi(value = 24)
public final @NonNull DataStore<@NonNull T> <T extends Object> createInDeviceProtectedStorage(
    @NonNull Context context,
    @NonNull String fileName,
    @NonNull Serializer<@NonNull T> serializer,
    ReplaceFileCorruptionHandler<@NonNull T> corruptionHandler,
    @NonNull List<@NonNull DataMigration<@NonNull T>> migrations,
    @NonNull CoroutineScope scope
)

Create an instance of SingleProcessDataStore that can be used during direct boot.

This API always creates the DataStore in the Device Encrypted storage.

Parameters
@NonNull Context context

The DeviceProtectedStorageContext which will be used to create the file that the new DataStore will act on.
@NonNull String fileName

the filename relative to Context.createDeviceProtectedStorageContext().filesDir that DataStore acts on. The File is obtained from deviceProtectedDataStoreFile. It is created in the "/datastore" subdirectory, in the device encrypted storage.
@NonNull Serializer<@NonNull T> serializer

Serializer for the type T used with DataStore. The type T must be immutable.
ReplaceFileCorruptionHandler<@NonNull T> corruptionHandler

The corruptionHandler is invoked if DataStore encounters a CorruptionException when attempting to read data. CorruptionExceptions are thrown by serializers when data can not be de-serialized.
@NonNull List<@NonNull DataMigration<@NonNull T>> migrations

Migrations are run before any access to data can occur. Migrations must be idempotent.
@NonNull CoroutineScope scope

The scope in which IO operations and transform functions will execute.
Returns
@NonNull DataStore<@NonNull T>

a new DataStore instance with the provided configuration

createWithTracing

public final @NonNull DataStore<@NonNull T> <T extends Object> createWithTracing(
    @NonNull Storage<@NonNull T> storage,
    @NonNull Tracer tracer,
    @NonNull CorruptionHandler<@NonNull T> corruptionHandler,
    @NonNull List<@NonNull DataMigration<@NonNull T>> migrations,
    @NonNull CoroutineScope scope
)

Create an instance of SingleProcessDataStore with tracing enabled.

Parameters
@NonNull Storage<@NonNull T> storage

Storage for the type T used with DataStore. The type T must be immutable.
@NonNull Tracer tracer

The Tracer used to instrument and trace DataStore operations.
@NonNull CorruptionHandler<@NonNull T> corruptionHandler

The corruptionHandler is invoked if DataStore encounters a CorruptionException when attempting to read data. CorruptionExceptions are thrown by serializers when data can not be de-serialized.
@NonNull List<@NonNull DataMigration<@NonNull T>> migrations

Migrations are run before any access to data can occur. Migrations must be idempotent.
@NonNull CoroutineScope scope

The scope in which IO operations and transform functions will execute.
Returns
@NonNull DataStore<@NonNull T>

a new DataStore instance with the provided configuration.
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