zio.query.internal.Sequential.scala Maven / Gradle / Ivy
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/*
* Copyright 2019-2023 John A. De Goes and the ZIO Contributors
*
* 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.
*/
package zio.query.internal
import zio.Chunk
import zio.query.DataSource
import zio.stacktracer.TracingImplicits.disableAutoTrace
/**
* A `Sequential[R]` maintains a mapping from data sources to batches of
* requests from those data sources that must be executed sequentially.
*/
private[query] final class Sequential[-R](
private val map: Map[DataSource[Any, Any], Chunk[Chunk[BlockedRequest[Any]]]]
) { self =>
/**
* Combines this collection of batches of requests that must be executed
* sequentially with that collection of batches of requests that must be
* executed sequentially to return a new collection of batches of requests
* that must be executed sequentially.
*/
def ++[R1 <: R](that: Sequential[R1]): Sequential[R1] =
new Sequential(
that.map.foldLeft(self.map) { case (map, (k, v)) =>
map + (k -> map.get(k).fold[Chunk[Chunk[BlockedRequest[Any]]]](v)(_ ++ v))
}
)
/**
* Returns whether this collection of batches of requests is empty.
*/
def isEmpty: Boolean =
map.isEmpty
def head: DataSource[R, Any] =
map.head._1
def size: Int =
map.size
/**
* Converts this collection of batches requests that must be executed
* sequentially to an `Iterable` containing mappings from data sources to
* batches of requests from those data sources.
*/
def toIterable: Iterable[(DataSource[R, Any], Chunk[Chunk[BlockedRequest[Any]]])] =
map
}