io.fluxcapacitor.javaclient.modeling.Aggregate Maven / Gradle / Ivy

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Default Java client library for interfacing with Flux Capacitor.

There is a newer version: 0.1015.0

/*
 * Copyright (c) 2016-2018 Flux Capacitor.
 *
 * 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 io.fluxcapacitor.javaclient.modeling;

import io.fluxcapacitor.common.api.Metadata;
import io.fluxcapacitor.javaclient.common.Message;
import io.fluxcapacitor.javaclient.tracking.handling.validation.ValidationUtils;

import java.time.Instant;
import java.util.function.Function;
import java.util.function.Predicate;

public interface Aggregate {

    String AGGREGATE_ID_METADATA_KEY = "$aggregateId";
    String AGGREGATE_TYPE_METADATA_KEY = "$aggregateType";

    T get();
    
    String lastEventId();
    
    Instant timestamp();

    Aggregate apply(Message eventMessage);

    default Aggregate apply(Object event) {
        return apply(new Message(event));
    }

    default Aggregate apply(Object event, Metadata metadata) {
        return apply(new Message(event, metadata));
    }

    default Aggregate apply(Function eventFunction) {
        return apply(eventFunction.apply(get()));
    }

    default  Aggregate assertLegal(Object command) throws E {
        ValidationUtils.assertLegal(command, get());
        return this;
    }

    default  Aggregate assertThat(Validator validator) throws E {
        validator.validate(this.get());
        return this;
    }

    default  Aggregate ensure(Predicate check, Function errorProvider) throws E {
        if (!check.test(get())) {
            throw errorProvider.apply(get());
        }
        return this;
    }

    @FunctionalInterface
    interface Validator {
        void validate(T model) throws E;
    }
}