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streams.scala
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streams.scala
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/*
* Copyright 2020 Scala EventStoreDB Client
*
* 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 sec
package syntax
import fs2.Stream
import sec.api._
trait StreamsSyntax {
extension [F[_]](s: Streams[F]) {
// / Subscription
/** Subscribes to the global stream, [[StreamId.All]] without resolving [[EventType.LinkTo]] events.
*
* @param exclusiveFrom
* position to start from. Use [[scala.None]] to subscribe from the beginning.
* @return
* a [[fs2.Stream]] that emits [[Event]] values.
*/
def subscribeToAll(
exclusiveFrom: Option[LogPosition]
): Stream[F, Event] =
s.subscribeToAll(exclusiveFrom, resolveLinkTos = false)
/** Subscribes to the global stream, [[StreamId.All]] using a subscription filter without resolving
* [[EventType.LinkTo]] events.
*
* @param exclusiveFrom
* log position to start from. Use [[scala.None]] to subscribe from the beginning.
* @param filterOptions
* to use when subscribing - See [[sec.api.SubscriptionFilterOptions]].
* @return
* a [[fs2.Stream]] that emits either [[sec.api.Checkpoint]] or [[Event]] values. How frequent
* [[sec.api.Checkpoint]] is emitted depends on @filterOptions.
*/
def subscribeToAll(
exclusiveFrom: Option[LogPosition],
filterOptions: SubscriptionFilterOptions
): Stream[F, Either[Checkpoint, Event]] =
s.subscribeToAll(exclusiveFrom, filterOptions, resolveLinkTos = false)
/** Subscribes to an individual stream without resolving [[EventType.LinkTo]] events.
*
* @param streamId
* the id of the stream to subscribe to.
* @param exclusiveFrom
* stream position to start from. Use [[scala.None]] to subscribe from the beginning.
* @return
* a [[fs2.Stream]] that emits [[Event]] values.
*/
def subscribeToStream(
streamId: StreamId,
exclusiveFrom: Option[StreamPosition]
): Stream[F, Event] =
s.subscribeToStream(streamId, exclusiveFrom, resolveLinkTos = false)
// / Read
/** Read events forwards from the global stream, [[sec.StreamId.All]].
*
* @param from
* log position to read from.
* @param maxCount
* limits maximum events returned.
* @param resolveLinkTos
* whether to resolve [[EventType.LinkTo]] events automatically.
* @return
* a [[fs2.Stream]] that emits [[Event]] values.
*/
def readAllForwards(
from: LogPosition = LogPosition.Start,
maxCount: Long = Long.MaxValue,
resolveLinkTos: Boolean = false
): Stream[F, Event] =
s.readAll(from, Direction.Forwards, maxCount, resolveLinkTos)
/** Read events backwards from the global stream, [[sec.StreamId.All]].
*
* @param from
* log position to read from.
* @param maxCount
* limits maximum events returned.
* @param resolveLinkTos
* whether to resolve [[EventType.LinkTo]] events automatically.
* @return
* a [[fs2.Stream]] that emits [[Event]] values.
*/
def readAllBackwards(
from: LogPosition = LogPosition.End,
maxCount: Long = Long.MaxValue,
resolveLinkTos: Boolean = false
): Stream[F, Event] =
s.readAll(from, Direction.Backwards, maxCount, resolveLinkTos)
/** Read events forwards from an individual stream. A [[sec.api.exceptions.StreamNotFound]] is raised when the
* stream does not exist.
*
* @param streamId
* the id of the stream to read from.
* @param from
* stream position to read from.
* @param maxCount
* limits maximum events returned.
* @param resolveLinkTos
* whether to resolve [[EventType.LinkTo]] events automatically.
* @return
* a [[fs2.Stream]] that emits [[Event]] values.
*/
def readStreamForwards(
streamId: StreamId,
from: StreamPosition = StreamPosition.Start,
maxCount: Long = Long.MaxValue,
resolveLinkTos: Boolean = false
): Stream[F, Event] =
s.readStream(streamId, from, Direction.Forwards, maxCount, resolveLinkTos)
/** Read events backwards from an individual stream. A [[sec.api.exceptions.StreamNotFound]] is raised when the
* stream does not exist.
*
* @param streamId
* the id of the stream to read from.
* @param from
* stream position to read from.
* @param maxCount
* limits maximum events returned.
* @param resolveLinkTos
* whether to resolve [[EventType.LinkTo]] events automatically.
* @return
* a [[fs2.Stream]] that emits [[Event]] values.
*/
def readStreamBackwards(
streamId: StreamId,
from: StreamPosition = StreamPosition.End,
maxCount: Long = Long.MaxValue,
resolveLinkTos: Boolean = false
): Stream[F, Event] =
s.readStream(streamId, from, Direction.Backwards, maxCount, resolveLinkTos)
}
}