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%% This Source Code Form is subject to the terms of the Mozilla Public
%% License, v. 2.0. If a copy of the MPL was not distributed with this
%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
%%
%% Copyright (c) 2010-2020 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(rabbit_mirror_queue_mode).
-behaviour(rabbit_registry_class).
-export([added_to_rabbit_registry/2, removed_from_rabbit_registry/1]).
-type master() :: node().
-type slave() :: node().
-type params() :: any().
-callback description() -> [proplists:property()].
%% Called whenever we think we might need to change nodes for a
%% mirrored queue. Note that this is called from a variety of
%% contexts, both inside and outside Mnesia transactions. Ideally it
%% will be pure-functional.
%%
%% Takes: parameters set in the policy,
%% current master,
%% current mirrors,
%% current synchronised mirrors,
%% all nodes to consider
%%
%% Returns: tuple of new master, new mirrors
%%
-callback suggested_queue_nodes(
params(), master(), [slave()], [slave()], [node()]) ->
{master(), [slave()]}.
%% Are the parameters valid for this mode?
-callback validate_policy(params()) ->
rabbit_policy_validator:validate_results().
added_to_rabbit_registry(_Type, _ModuleName) -> ok.
removed_from_rabbit_registry(_Type) -> ok.
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