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Trino - Hudi connector
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/*
 * 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.trino.plugin.hudi;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.inject.Injector;
import io.airlift.bootstrap.LifeCycleManager;
import io.trino.plugin.base.classloader.ClassLoaderSafeConnectorMetadata;
import io.trino.plugin.base.session.SessionPropertiesProvider;
import io.trino.plugin.hive.HiveTransactionHandle;
import io.trino.spi.classloader.ThreadContextClassLoader;
import io.trino.spi.connector.Connector;
import io.trino.spi.connector.ConnectorMetadata;
import io.trino.spi.connector.ConnectorNodePartitioningProvider;
import io.trino.spi.connector.ConnectorPageSourceProvider;
import io.trino.spi.connector.ConnectorSession;
import io.trino.spi.connector.ConnectorSplitManager;
import io.trino.spi.connector.ConnectorTransactionHandle;
import io.trino.spi.connector.SystemTable;
import io.trino.spi.session.PropertyMetadata;
import io.trino.spi.transaction.IsolationLevel;

import java.util.List;
import java.util.Set;

import static com.google.common.collect.ImmutableList.toImmutableList;
import static io.trino.spi.transaction.IsolationLevel.SERIALIZABLE;
import static io.trino.spi.transaction.IsolationLevel.checkConnectorSupports;
import static java.util.Objects.requireNonNull;

public class HudiConnector
        implements Connector
{
    private final Injector injector;
    private final LifeCycleManager lifeCycleManager;
    private final HudiTransactionManager transactionManager;
    private final ConnectorSplitManager splitManager;
    private final ConnectorPageSourceProvider pageSourceProvider;
    private final ConnectorNodePartitioningProvider nodePartitioningProvider;
    private final Set systemTables;
    private final List> sessionProperties;
    private final List> tableProperties;

    public HudiConnector(
            Injector injector,
            LifeCycleManager lifeCycleManager,
            HudiTransactionManager transactionManager,
            ConnectorSplitManager splitManager,
            ConnectorPageSourceProvider pageSourceProvider,
            ConnectorNodePartitioningProvider nodePartitioningProvider,
            Set systemTables,
            Set sessionPropertiesProviders,
            List> tableProperties)
    {
        this.injector = requireNonNull(injector, "injector is null");
        this.lifeCycleManager = requireNonNull(lifeCycleManager, "lifeCycleManager is null");
        this.transactionManager = requireNonNull(transactionManager, "transactionManager is null");
        this.splitManager = requireNonNull(splitManager, "splitManager is null");
        this.pageSourceProvider = requireNonNull(pageSourceProvider, "pageSourceProvider is null");
        this.nodePartitioningProvider = requireNonNull(nodePartitioningProvider, "nodePartitioningProvider is null");
        this.systemTables = ImmutableSet.copyOf(requireNonNull(systemTables, "systemTables is null"));
        this.sessionProperties = requireNonNull(sessionPropertiesProviders, "sessionPropertiesProviders is null").stream()
                .flatMap(sessionPropertiesProvider -> sessionPropertiesProvider.getSessionProperties().stream())
                .collect(toImmutableList());
        this.tableProperties = ImmutableList.copyOf(requireNonNull(tableProperties, "tableProperties is null"));
    }

    @Override
    public ConnectorMetadata getMetadata(ConnectorSession session, ConnectorTransactionHandle transactionHandle)
    {
        ConnectorMetadata metadata = transactionManager.get(transactionHandle, session.getIdentity());
        return new ClassLoaderSafeConnectorMetadata(metadata, getClass().getClassLoader());
    }

    @Override
    public ConnectorSplitManager getSplitManager()
    {
        return splitManager;
    }

    @Override
    public ConnectorPageSourceProvider getPageSourceProvider()
    {
        return pageSourceProvider;
    }

    @Override
    public ConnectorNodePartitioningProvider getNodePartitioningProvider()
    {
        return nodePartitioningProvider;
    }

    @Override
    public Set getSystemTables()
    {
        return systemTables;
    }

    @Override
    public List> getSessionProperties()
    {
        return sessionProperties;
    }

    @Override
    public List> getTableProperties()
    {
        return tableProperties;
    }

    @Override
    public ConnectorTransactionHandle beginTransaction(IsolationLevel isolationLevel, boolean readOnly, boolean autoCommit)
    {
        checkConnectorSupports(SERIALIZABLE, isolationLevel);
        ConnectorTransactionHandle transaction = new HiveTransactionHandle(true);
        try (ThreadContextClassLoader _ = new ThreadContextClassLoader(getClass().getClassLoader())) {
            transactionManager.put(transaction);
        }
        return transaction;
    }

    @Override
    public void commit(ConnectorTransactionHandle transaction)
    {
        transactionManager.commit(transaction);
    }

    @Override
    public void rollback(ConnectorTransactionHandle transaction)
    {
        transactionManager.rollback(transaction);
    }

    @Override
    public final void shutdown()
    {
        lifeCycleManager.stop();
    }

    @VisibleForTesting
    public Injector getInjector()
    {
        return injector;
    }
}