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ResultVisitor.java
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ResultVisitor.java
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/*
* Copyright (c) 2019 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.internal.utils.persistentactors.results;
import java.util.concurrent.CompletionStage;
import org.eclipse.ditto.base.model.exceptions.DittoRuntimeException;
import org.eclipse.ditto.base.model.headers.WithDittoHeaders;
import org.eclipse.ditto.base.model.signals.commands.Command;
import org.eclipse.ditto.base.model.signals.events.Event;
/**
* Evaluator of results of command strategies.
*
* @param <E> type of events.
*/
public interface ResultVisitor<E extends Event<?>> {
/**
* Evaluate the empty result. Do nothing by default.
*/
default void onEmpty() {
// do nothing on empty result by default
}
/**
* Evaluate a mutation result.
*
* @param command command that caused the mutation.
* @param event event of the mutation.
* @param response response of the command.
* @param becomeCreated whether the actor should behave as if the entity is created.
* @param becomeDeleted whether the actor should behave as if the entity is deleted.
*/
void onMutation(Command<?> command, CompletionStage<E> event, CompletionStage<WithDittoHeaders> response,
boolean becomeCreated, boolean becomeDeleted);
/**
* Evaluate a query result.
*
* @param command the query command.
* @param response the response.
*/
void onQuery(Command<?> command, CompletionStage<WithDittoHeaders> response);
/**
* Evaluate an error result.
*
* @param error the error.
*/
void onError(DittoRuntimeException error, Command<?> errorCausingCommand);
}