org.axonframework.axonserver.connector.util

Class GrpcMetaDataConverter

java.lang.Object

org.axonframework.axonserver.connector.util.GrpcMetaDataConverter

public class GrpcMetaDataConverter
extends Object

Utility class for converting gRPC MetaData entries into a Java Map and vice versa.

To optimize communication and minimize the loss of data structure, the MetaDataValue entries used in gRPC distinguish between numerical values (double or long), Strings, booleans and arbitrary objects. The latter group is converted to and from a byte[] using the configured Serializer.

Since:

4.0

Author:

Marc Gathier

Constructor Summary

Constructors

Constructor and Description
GrpcMetaDataConverter(Serializer serializer) Initialize the converter, using the given serializer to serialize Objects.

Method Summary

Modifier and Type	Method and Description
MetaData	convert(Map<String,MetaDataValue> metaDataMap) Convert the given Map of MetaDataValues to a Map containing the Java representations of each of those values.
Object	convertFromMetaDataValue(MetaDataValue value) Convert the given MetaDataValue to its Java representation.
MetaDataValue	convertToMetaDataValue(Object value) Convert the given value into a MetaDataValue, attempting to maintain the source type as much as possible in the returned MetaDataValue.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GrpcMetaDataConverter

public GrpcMetaDataConverter(Serializer serializer)

Initialize the converter, using the given serializer to serialize Objects.

Parameters:

serializer - the Serializer to serialize objects with

Method Detail

convertToMetaDataValue

public MetaDataValue convertToMetaDataValue(Object value)

Convert the given value into a MetaDataValue, attempting to maintain the source type as much as possible in the returned MetaDataValue.

• A CharSequence (such as String) is stored as a 'string'
• A Float or Double values is represented as a 'double'
• A Number that is not a Double or Float is represented as a 'sint64'
• A Boolean is represented as a 'bool'
• Any other object is serialized and stored as bytes

Parameters:

value - the Object to convert into a MetaDataValue

Returns:

a MetaDataValue representing the given value

convert

public MetaData convert(Map<String,MetaDataValue> metaDataMap)

Convert the given Map of MetaDataValues to a Map containing the Java representations of each of those values.

See convertToMetaDataValue(Object) for details about the mapping.

Parameters:

metaDataMap - a Map containing MetaDataValue representations of each MetaData key

Returns:

a MetaData map containing the same keys, referencing to the Java representation of each corresponding value in the given metaDataMap

convertFromMetaDataValue

public Object convertFromMetaDataValue(MetaDataValue value)

Convert the given MetaDataValue to its Java representation.

See convertToMetaDataValue(Object) for details about the mapping.

Parameters:

value - the MetaDataValue to convert to its Java representation

Returns:

an Object representing the same value