org.hyperledger.fabric.gateway

Enum DefaultQueryHandlers

java.lang.Object

java.lang.Enum<DefaultQueryHandlers>

org.hyperledger.fabric.gateway.DefaultQueryHandlers

All Implemented Interfaces:

Serializable, Comparable<DefaultQueryHandlers>, QueryHandlerFactory

public enum DefaultQueryHandlers
extends Enum<DefaultQueryHandlers>
implements QueryHandlerFactory

Default query handler implementations. Instances can be referenced directly or looked up by name, for example DefaultQueryHandlers.valueOf("MSPID_SCOPE_ROUND_ROBIN").

Enum Constant Summary

Enum Constants

Enum Constant and Description
MSPID_SCOPE_ROUND_ROBIN For each subsequent query, the next peer in the list is used.
MSPID_SCOPE_SINGLE The last peer that provided a successful response is used.
PREFER_MSPID_SCOPE_ROUND_ROBIN For each subsequent query, the next peer in the list is used.
PREFER_MSPID_SCOPE_SINGLE The last peer that provided a successful response is used.

Method Summary

Modifier and Type	Method and Description
QueryHandler	create(Network network) Factory function to create a query handler instance.
static DefaultQueryHandlers	valueOf(String name) Returns the enum constant of this type with the specified name.
static DefaultQueryHandlers[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

MSPID_SCOPE_SINGLE

public static final DefaultQueryHandlers MSPID_SCOPE_SINGLE

The last peer that provided a successful response is used. If a peer fails then all other peers will be tried in turn until one provides a successful response. If no peers respond then an exception is thrown.

MSPID_SCOPE_ROUND_ROBIN

public static final DefaultQueryHandlers MSPID_SCOPE_ROUND_ROBIN

For each subsequent query, the next peer in the list is used. If a peer fails then all other peers will be tried in turn until one provides a successful response. If no peers respond then an exception is thrown.

PREFER_MSPID_SCOPE_SINGLE

public static final DefaultQueryHandlers PREFER_MSPID_SCOPE_SINGLE

The last peer that provided a successful response is used. If a peer fails then all other peers will be tried in turn until one provides a successful response. If no peers respond then an exception is thrown. If the user's organization has no peers, then all peers in the network will be used.

PREFER_MSPID_SCOPE_ROUND_ROBIN

public static final DefaultQueryHandlers PREFER_MSPID_SCOPE_ROUND_ROBIN

For each subsequent query, the next peer in the list is used. If a peer fails then all other peers will be tried in turn until one provides a successful response. If no peers respond then an exception is thrown. If the user's organization has no peers, then all peers in the network will be used.

Method Detail

values

public static DefaultQueryHandlers[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (DefaultQueryHandlers c : DefaultQueryHandlers.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static DefaultQueryHandlers valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

create

public QueryHandler create(Network network)

Description copied from interface: QueryHandlerFactory

Factory function to create a query handler instance.

Specified by:

create in interface QueryHandlerFactory

Parameters:

network - Network on which the query is invoked.

Returns:

A query handler.