Package org.apache.hadoop.ipc

Interface VersionedProtocol

public interface VersionedProtocol

Superclass of all protocols that use Hadoop RPC. Subclasses of this interface are also supposed to have a static final long versionID field.

Method Summary

Modifier and Type	Method	Description
ProtocolSignature	getProtocolSignature(java.lang.String protocol, long clientVersion, int clientMethodsHash)	Return protocol version corresponding to protocol interface.
long	getProtocolVersion(java.lang.String protocol, long clientVersion)	Return protocol version corresponding to protocol interface.

Method Detail

getProtocolVersion

long getProtocolVersion(java.lang.String protocol,
                        long clientVersion)
                 throws java.io.IOException

Return protocol version corresponding to protocol interface.

Parameters:

protocol - The classname of the protocol interface

clientVersion - The version of the protocol that the client speaks

Returns:

the version that the server will speak

Throws:

java.io.IOException - if any IO error occurs

getProtocolSignature

ProtocolSignature getProtocolSignature(java.lang.String protocol,
                                       long clientVersion,
                                       int clientMethodsHash)
                                throws java.io.IOException

Return protocol version corresponding to protocol interface.

Parameters:

protocol - The classname of the protocol interface

clientVersion - The version of the protocol that the client speaks

clientMethodsHash - the hashcode of client protocol methods

Returns:

the server protocol signature containing its version and a list of its supported methods

Throws:

java.io.IOException - raised on errors performing I/O.

See Also:

for a default implementation