     1: <?php
     2: /**
     3:  * Copyright 2012-2014 Rackspace US, Inc.
     4:  *
     5:  * Licensed under the Apache License, Version 2.0 (the "License");
     6:  * you may not use this file except in compliance with the License.
     7:  * You may obtain a copy of the License at
     8:  *
     9:  * http://www.apache.org/licenses/LICENSE-2.0
    10:  *
    11:  * Unless required by applicable law or agreed to in writing, software
    12:  * distributed under the License is distributed on an "AS IS" BASIS,
    13:  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14:  * See the License for the specific language governing permissions and
    15:  * limitations under the License.
    16:  */
    17:
    18: namespace OpenCloud\LoadBalancer\Resource;
    19:
    20: /**
    21:  * All load balancers utilize an algorithm that defines how traffic should be
    22:  * directed between back-end nodes. The default algorithm for newly created load
    23:  * balancers is RANDOM, which can be overridden at creation time or changed
    24:  * after the load balancer has been initially provisioned. The algorithm name is
    25:  * to be constant within a major revision of the load balancing API, though new
    26:  * algorithms may be created with a unique algorithm name within a given major
    27:  * revision of the service API.
    28:  *
    29:  * Accepted options are:
    30:  *
    31:  * * LEAST_CONNECTIONS: The node with the lowest number of connections will
    32:  *      receive requests.
    33:  *
    34:  * * RANDOM: Back-end servers are selected at random.
    35:  *
    36:  * * ROUND_ROBIN: Connections are routed to each of the back-end servers in turn.
    37:  *
    38:  * * WEIGHTED_LEAST_CONNECTIONS: Each request will be assigned to a node based
    39:  *      on the number of concurrent connections to the node and its weight.
    40:  *
    41:  * * WEIGHTED_ROUND_ROBIN: A round robin algorithm, but with different
    42:  *      proportions of traffic being directed to the back-end nodes. Weights
    43:  *      must be defined as part of the load balancer's node configuration.
    44:  */
    45: class Algorithm extends ReadOnlyResource
    46: {
    47:     public $name;
    48:
    49:     protected static $json_name = 'algorithm';
    50:     protected static $url_resource = 'loadbalancers/algorithms';
    51: }
    52: