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// Copyright 2015-2018 Aerospike, Inc. // // Portions may be licensed to Aerospike, Inc. under one or more contributor // license agreements. // // Licensed under the Apache License, Version 2.0 (the "License"); you may not // use this file except in compliance with the License. You may obtain a copy of // the License at http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the // License for the specific language governing permissions and limitations under // the License. use policy::{BasePolicy, PolicyLike}; /// `QueryPolicy` encapsulates parameters for query operations. #[derive(Debug, Clone)] pub struct QueryPolicy { /// Base policy instance pub base_policy: BasePolicy, /// Maximum number of concurrent requests to server nodes at any point in time. If there are 16 /// nodes in the cluster and `max_concurrent_nodes` is 8, then queries will be made to 8 nodes /// in parallel. When a query completes, a new query will be issued until all 16 nodes have /// been queried. Default (0) is to issue requests to all server nodes in parallel. pub max_concurrent_nodes: usize, /// Number of records to place in queue before blocking. Records received from multiple server /// nodes will be placed in a queue. A separate thread consumes these records in parallel. If /// the queue is full, the producer threads will block until records are consumed. pub record_queue_size: usize, /// Terminate query if cluster is in fluctuating state. pub fail_on_cluster_change: bool, } impl QueryPolicy { /// Create a new query policy instance with default parameters. pub fn new() -> Self { QueryPolicy::default() } } impl Default for QueryPolicy { fn default() -> QueryPolicy { QueryPolicy { base_policy: BasePolicy::default(), max_concurrent_nodes: 0, record_queue_size: 1024, fail_on_cluster_change: true, } } } impl PolicyLike for QueryPolicy { fn base(&self) -> &BasePolicy { &self.base_policy } }