io.fluxcapacitor.javaclient.eventsourcing.CacheInvalidatingInterceptor 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.eventsourcing;

import io.fluxcapacitor.common.api.tracking.MessageBatch;
import io.fluxcapacitor.javaclient.tracking.BatchInterceptor;
import io.fluxcapacitor.javaclient.tracking.Tracker;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;

import java.util.function.Consumer;

@Slf4j
@RequiredArgsConstructor
public class CacheInvalidatingInterceptor implements BatchInterceptor {
    private final EventSourcing eventSourcing;
    private int[] lastSegment;

    @Override
    public Consumer intercept(Consumer consumer, Tracker tracker) {
        return batch -> {
            if (shouldInvalidateCache(batch.getSegment())) {
                log.info("Consumer segment changed. Invalidating event model caches.");
                try {
                    eventSourcing.invalidateCache();
                } catch (Exception e) {
                    log.error("Failed to invalidate event model cache", e);
                }
            }
            if (batch.getSegment()[0] != batch.getSegment()[1]) {
                lastSegment = batch.getSegment();
            }
            consumer.accept(batch);
        };
    }

    private boolean shouldInvalidateCache(int[] newSegment) {
        return lastSegment != null
                && newSegment[0] != newSegment[1]
                && (newSegment[0] > lastSegment[0] || newSegment[1] < lastSegment[1]);
    }
}