io.streamthoughts.azkarra.api.query.internal.TimestampedWindowFetchQuery Maven / Gradle / Ivy

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/*
 * Copyright 2019-2020 StreamThoughts.
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.streamthoughts.azkarra.api.query.internal;

import io.streamthoughts.azkarra.api.model.KV;
import io.streamthoughts.azkarra.api.monad.Reader;
import io.streamthoughts.azkarra.api.monad.Try;
import io.streamthoughts.azkarra.api.query.GenericQueryParams;
import io.streamthoughts.azkarra.api.query.LocalStoreAccessProvider;
import io.streamthoughts.azkarra.api.query.LocalStoreAccessor;
import io.streamthoughts.azkarra.api.query.QueryRequest;
import io.streamthoughts.azkarra.api.query.StoreOperation;
import io.streamthoughts.azkarra.api.query.StoreType;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.streams.state.ReadOnlyWindowStore;
import org.apache.kafka.streams.state.ValueAndTimestamp;

import java.util.Collections;
import java.util.List;
import java.util.Optional;

public class TimestampedWindowFetchQuery extends BaseKeyedLocalStoreQuery {

    private final long time;

    /**
     * Creates a new {@link TimestampedWindowFetchQuery} instance.
     *
     * @param key           the record key.
     * @param keySerializer the key serializer.
     */
    TimestampedWindowFetchQuery(final String store,
                                final K key,
                                final Serializer keySerializer,
                                final long time) {
        super(new QueryRequest()
                .storeName(store)
                .storeType(StoreType.WINDOW)
                .storeOperation(StoreOperation.FETCH)
                .params(new GenericQueryParams()
                        .put(QueryConstants.QUERY_PARAM_KEY, key)
                        .put(QueryConstants.QUERY_PARAM_TIME, time)
                )
                , key, keySerializer);
        this.time = time;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Try>> execute(final LocalStoreAccessProvider provider, final long limit) {

        final LocalStoreAccessor>> accessor =
                provider.localTimestampedWindowStore(getStoreName());

        final Reader>, List>> reader =
            reader(getKey(), time).map(value -> Optional.ofNullable(value)
                .map(v -> Collections.singletonList(new KV<>(getKey(), v.value(), v.timestamp())))
                .orElse(Collections.emptyList()));

        return new LocalStoreQueryExecutor<>(accessor).execute(reader);
    }

    private Reader>, ValueAndTimestamp> reader(final K key,
                                                                                              final long time) {
        return Reader.of(store -> store.fetch(key, time));
    }
}