Class CommandInterpreter

Represents interpreter of the log entries.

Inheritance
object
Disposable
CommandInterpreter
Implements
Inherited Members
Namespace: DotNext.Net.Cluster.Consensus.Raft.Commands
Assembly: DotNext.Net.Cluster.dll
Syntax
public class CommandInterpreter : Disposable, IDisposable, IBuildable<CommandInterpreter, CommandInterpreter.Builder>
Remarks

The interpreter can be constructed in two ways: using CommandInterpreter.Builder and through inheritance. If you choose the inheritance then command handlers must be declared as public instance methods marked with CommandInterpreter.CommandHandlerAttribute attribute. Otherwise, command handlers can be registered through the builder. Typically, the interpreter is aggregated by the class derived from PersistentState. All command types must be registered using CommandAttribute<TCommand> attributes applied to the derived type.

Constructors

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CommandInterpreter()

Initializes a new interpreter and discovers methods marked with CommandInterpreter.CommandHandlerAttribute attribute.

Declaration
protected CommandInterpreter()

Methods

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CreateLogEntry<TCommand>(TCommand, long)

Wraps the command to the log entry.

Declaration
public LogEntry<TCommand> CreateLogEntry<TCommand>(TCommand command, long term) where TCommand : ISerializable<TCommand>
Parameters
Type Name Description
TCommand command

The payload of the command.
long term

The term of the local node.
Returns
Type Description
LogEntry<TCommand>

The instance of the log entry containing the command.
Type Parameters
Name Description
TCommand

The type of the command.
Exceptions
Type Condition
GenericArgumentException

TCommand is not registered with CommandAttribute<TCommand>.
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InterpretAsync<TEntry>(TEntry, object?, CancellationToken)

Interprets log entry asynchronously.

Declaration
public ValueTask<int> InterpretAsync<TEntry>(TEntry entry, object? context, CancellationToken token = default) where TEntry : struct, IRaftLogEntry
Parameters
Type Name Description
TEntry entry

The log entry to be interpreted.
object context

The context to be passed to the handler.
CancellationToken token

The token that can be used to cancel the interpretation.
Returns
Type Description
ValueTask<int>

The ID of the interpreted log entry.
Type Parameters
Name Description
TEntry

The type of the log entry to be interpreted.
Remarks

Typically this method is called by the custom implementation of ApplyAsync(LogEntry) method.

Exceptions
Type Condition
CommandInterpreter.UnknownCommandException

The command handler was not registered for the command represented by entry.
OperationCanceledException

The operation has been canceled.
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InterpretAsync<TEntry>(TEntry, CancellationToken)

Interprets log entry asynchronously.

Declaration
public ValueTask<int> InterpretAsync<TEntry>(TEntry entry, CancellationToken token = default) where TEntry : struct, IRaftLogEntry
Parameters
Type Name Description
TEntry entry

The log entry to be interpreted.
CancellationToken token

The token that can be used to cancel the interpretation.
Returns
Type Description
ValueTask<int>

The ID of the interpreted log entry.
Type Parameters
Name Description
TEntry

The type of the log entry to be interpreted.
Remarks

Typically this method is called by the custom implementation of ApplyAsync(LogEntry) method.

Exceptions
Type Condition
CommandInterpreter.UnknownCommandException

The command handler was not registered for the command represented by entry.
OperationCanceledException

The operation has been canceled.

Implements

Extension Methods