org.talend.sdk.component.runtime.input.PartitionMapperImpl Maven / Gradle / Ivy

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/**
 * Copyright (C) 2006-2021 Talend Inc. - www.talend.com
 *
 * 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 org.talend.sdk.component.runtime.input;

import static java.util.Collections.emptySet;
import static java.util.Optional.ofNullable;
import static java.util.stream.Collectors.toList;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;

import org.talend.sdk.component.api.input.Assessor;
import org.talend.sdk.component.api.input.Emitter;
import org.talend.sdk.component.api.input.Split;
import org.talend.sdk.component.api.service.configuration.LocalConfiguration;
import org.talend.sdk.component.runtime.base.Delegated;
import org.talend.sdk.component.runtime.base.LifecycleImpl;
import org.talend.sdk.component.runtime.serialization.ContainerFinder;
import org.talend.sdk.component.runtime.serialization.EnhancedObjectInputStream;

import lombok.AllArgsConstructor;

public class PartitionMapperImpl extends LifecycleImpl implements Mapper, Delegated {

    private static final Object[] NO_ARG = new Object[0];

    private String inputName;

    private boolean stream;

    private transient Method assessor;

    private transient Method split;

    private transient Method inputFactory;

    private transient Function splitArgSupplier;

    public PartitionMapperImpl(final String rootName, final String name, final String inputName, final String plugin,
            final boolean stream, final Serializable instance) {
        super(instance, rootName, name, plugin);
        this.stream = stream;
        this.inputName = inputName;
    }

    protected PartitionMapperImpl() {
        // no-op
    }

    @Override
    public long assess() {
        lazyInit();
        if (assessor != null) {
            return Number.class.cast(doInvoke(assessor)).longValue();
        }
        return 1;
    }

    @Override
    public List split(final long desiredSize) {
        lazyInit();
        return ((Collection) doInvoke(split, splitArgSupplier.apply(desiredSize)))
                .stream()
                .map(Serializable.class::cast)
                .map(mapper -> new PartitionMapperImpl(rootName(), name(), inputName, plugin(), stream, mapper))
                .collect(toList());
    }

    @Override
    public Input create() {
        lazyInit();
        // note: we can surely mutualize/cache the reflection a bit here but let's wait
        // to see it is useful before doing it,
        // java 7/8 made enough progress to probably make it smooth OOTB
        final Serializable input = Serializable.class.cast(doInvoke(inputFactory));
        if (isStream()) {
            return new StreamingInputImpl(rootName(), inputName, plugin(), input, loadRetryConfiguration());
        }
        return new InputImpl(rootName(), inputName, plugin(), input);
    }

    private StreamingInputImpl.RetryConfiguration loadRetryConfiguration() {
        // note: this configuratoin could be read on the mapper too and distributed
        final LocalConfiguration configuration = ofNullable(ContainerFinder.Instance.get().find(plugin()))
                .map(it -> it.findService(LocalConfiguration.class))
                .orElseGet(() -> new LocalConfiguration() {

                    @Override
                    public String get(final String key) {
                        return null;
                    }

                    @Override
                    public Set keys() {
                        return emptySet();
                    }
                });
        final int maxRetries = ofNullable(configuration.get("talend.input.streaming.retry.maxRetries"))
                .map(Integer::parseInt)
                .orElse(Integer.MAX_VALUE);
        return new StreamingInputImpl.RetryConfiguration(maxRetries, getStrategy(configuration));
    }

    private StreamingInputImpl.RetryStrategy getStrategy(final LocalConfiguration configuration) {
        switch (ofNullable(configuration.get("talend.input.streaming.retry.strategy")).orElse("constant")) {
        case "exponential":
            return new StreamingInputImpl.RetryConfiguration.ExponentialBackoff(
                    ofNullable(configuration.get("talend.input.streaming.retry.exponential.exponent"))
                            .map(Double::parseDouble)
                            .orElse(1.5),
                    ofNullable(configuration.get("talend.input.streaming.retry.exponential.randomizationFactor"))
                            .map(Double::parseDouble)
                            .orElse(.5),
                    ofNullable(configuration.get("talend.input.streaming.retry.exponential.maxDuration"))
                            .map(Long::parseLong)
                            .orElse(TimeUnit.MINUTES.toMillis(5)),
                    ofNullable(configuration.get("talend.input.streaming.retry.exponential.initialBackOff"))
                            .map(Long::parseLong)
                            .orElse(TimeUnit.SECONDS.toMillis(1)),
                    0);
        case "constant":
        default:
            return new StreamingInputImpl.RetryConfiguration.Constant(
                    ofNullable(configuration.get("talend.input.streaming.retry.constant.timeout"))
                            .map(Long::parseLong)
                            .orElse(500L));
        }
    }

    @Override
    public boolean isStream() {
        return stream;
    }

    @Override
    public Object getDelegate() {
        return delegate;
    }

    private void lazyInit() {
        if (split == null || inputFactory == null) {
            inputName = inputName == null || inputName.isEmpty() ? name() : inputName;
            assessor = findMethods(Assessor.class).findFirst().orElse(null);
            split = findMethods(Split.class).findFirst().get();
            inputFactory = findMethods(Emitter.class).findFirst().get();

            switch (split.getParameterCount()) {
            case 1:
                if (int.class == split.getParameterTypes()[0]) {
                    splitArgSupplier = desiredSize -> new Object[] { desiredSize.intValue() };
                } else if (long.class == split.getParameterTypes()[0]) {
                    splitArgSupplier = desiredSize -> new Object[] { desiredSize };
                } else {
                    throw new IllegalArgumentException("@PartitionSize only supports int and long");
                }
                break;
            case 0:
            default:
                splitArgSupplier = desiredSize -> NO_ARG;
            }
        }
    }

    Object writeReplace() throws ObjectStreamException {
        return new SerializationReplacer(plugin(), rootName(), name(), inputName, stream, serializeDelegate());
    }

    @AllArgsConstructor
    private static class SerializationReplacer implements Serializable {

        private final String plugin;

        private final String component;

        private final String name;

        private final String input;

        private final boolean stream;

        private final byte[] value;

        Object readResolve() throws ObjectStreamException {
            try {
                return new PartitionMapperImpl(component, name, input, plugin, stream, loadDelegate());
            } catch (final IOException | ClassNotFoundException e) {
                final InvalidObjectException invalidObjectException = new InvalidObjectException(e.getMessage());
                invalidObjectException.initCause(e);
                throw invalidObjectException;
            }
        }

        private Serializable loadDelegate() throws IOException, ClassNotFoundException {
            try (final ObjectInputStream ois = new EnhancedObjectInputStream(new ByteArrayInputStream(value),
                    ContainerFinder.Instance.get().find(plugin).classloader())) {
                final Object obj = ois.readObject();
                return Serializable.class.cast(obj);
            }
        }
    }
}