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Merge pull request #1317 from SpineEventEngine/simplify-unicast-event…
…-routing Simplify unicast event routing
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66 changes: 66 additions & 0 deletions
66
server/src/main/java/io/spine/server/route/EventFnRoute.java
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| @@ -0,0 +1,66 @@ | ||
| /* | ||
| * Copyright 2020, TeamDev. All rights reserved. | ||
| * | ||
| * Redistribution and use in source and/or binary forms, with or without | ||
| * modification, must retain the above copyright notice and the following | ||
| * disclaimer. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| */ | ||
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| package io.spine.server.route; | ||
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| import io.spine.base.EventMessage; | ||
| import io.spine.core.EventContext; | ||
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| import java.util.Set; | ||
| import java.util.function.BiFunction; | ||
| import java.util.function.Function; | ||
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| import static com.google.common.base.Preconditions.checkNotNull; | ||
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| /** | ||
| * An event route with one target entity ID of which is obtained as a function | ||
| * on an event message or {@code BiFunction} on an event message and its context. | ||
| * | ||
| * @param <I> | ||
| * the type of the target entity ID | ||
| * @param <E> | ||
| * the type of the event message | ||
| */ | ||
| final class EventFnRoute<I, E extends EventMessage> implements EventRoute<I, E> { | ||
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| private static final long serialVersionUID = 0L; | ||
| private final BiFunction<E, EventContext, I> fn; | ||
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| /** | ||
| * Creates a new event route which obtains target entity ID from an event message. | ||
| */ | ||
| EventFnRoute(Function<E, I> fn) { | ||
| this((e, ctx) -> fn.apply(e)); | ||
| } | ||
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| /** | ||
| * Creates an event route which obtains target entity ID from an event message and | ||
| * a its context. | ||
| */ | ||
| EventFnRoute(BiFunction<E, EventContext, I> fn) { | ||
| this.fn = checkNotNull(fn); | ||
| } | ||
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| @Override | ||
| public Set<I> apply(E message, EventContext context) { | ||
| I id = fn.apply(message, context); | ||
| return EventRoute.withId(id); | ||
| } | ||
| } |
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