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Trino - Memory 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.memory;

import com.google.inject.Inject;
import io.airlift.bootstrap.LifeCycleManager;
import io.trino.spi.connector.Connector;
import io.trino.spi.connector.ConnectorCapabilities;
import io.trino.spi.connector.ConnectorMetadata;
import io.trino.spi.connector.ConnectorPageSinkProvider;
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.transaction.IsolationLevel;

import java.util.Set;

import static com.google.common.collect.Sets.immutableEnumSet;
import static io.trino.spi.connector.ConnectorCapabilities.NOT_NULL_COLUMN_CONSTRAINT;
import static java.util.Objects.requireNonNull;

public class MemoryConnector
        implements Connector
{
    private final LifeCycleManager lifeCycleManager;
    private final MemoryMetadata metadata;
    private final MemorySplitManager splitManager;
    private final MemoryPageSourceProvider pageSourceProvider;
    private final MemoryPageSinkProvider pageSinkProvider;

    @Inject
    public MemoryConnector(
            LifeCycleManager lifeCycleManager,
            MemoryMetadata metadata,
            MemorySplitManager splitManager,
            MemoryPageSourceProvider pageSourceProvider,
            MemoryPageSinkProvider pageSinkProvider)
    {
        this.lifeCycleManager = requireNonNull(lifeCycleManager, "lifeCycleManager is null");
        this.metadata = requireNonNull(metadata, "metadata is null");
        this.splitManager = requireNonNull(splitManager, "splitManager is null");
        this.pageSourceProvider = requireNonNull(pageSourceProvider, "pageSourceProvider is null");
        this.pageSinkProvider = requireNonNull(pageSinkProvider, "pageSinkProvider is null");
    }

    @Override
    public ConnectorTransactionHandle beginTransaction(IsolationLevel isolationLevel, boolean readOnly, boolean autoCommit)
    {
        return MemoryTransactionHandle.INSTANCE;
    }

    @Override
    public ConnectorMetadata getMetadata(ConnectorSession session, ConnectorTransactionHandle transactionHandle)
    {
        return metadata;
    }

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

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

    @Override
    public ConnectorPageSinkProvider getPageSinkProvider()
    {
        return pageSinkProvider;
    }

    @Override
    public Set getCapabilities()
    {
        return immutableEnumSet(NOT_NULL_COLUMN_CONSTRAINT);
    }

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