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/**
 * Copyright (c) 2016-2022 Deephaven Data Labs and Patent Pending
 */
package io.deephaven.engine.table.impl.sources.regioned;

import io.deephaven.base.verify.Require;
import io.deephaven.chunk.attributes.Any;
import io.deephaven.engine.table.SharedContext;
import io.deephaven.chunk.*;
import io.deephaven.engine.rowset.RowSequence;
import org.jetbrains.annotations.NotNull;

import javax.annotation.OverridingMethodsMustInvokeSuper;
import java.util.function.Supplier;

/**
 * Base deferred region implementation.
 */
public abstract class DeferredColumnRegionBase>
        extends GenericColumnRegionBase
        implements DeferredColumnRegion {

    private Supplier resultRegionFactory;

    private volatile REGION_TYPE resultRegion;

    DeferredColumnRegionBase(final long pageMask, @NotNull final Supplier resultRegionFactory) {
        super(pageMask);
        this.resultRegionFactory = Require.neqNull(resultRegionFactory, "resultRegionFactory");
    }

    @Override
    public void invalidate() {
        super.invalidate();
        synchronized (this) {
            if (resultRegion != null) {
                resultRegion.invalidate();
            }
        }
    }

    @Override
    public final REGION_TYPE getResultRegion() {
        if (resultRegion == null) {
            synchronized (this) {
                if (resultRegion == null) {
                    resultRegion = Require.neqNull(resultRegionFactory.get(), "resultRegionFactory.get()");
                    resultRegionFactory = null;
                }
            }
        }
        return resultRegion;
    }

    /**
     * Get the result region if it has already been supplied (because of a call to {@link #getResultRegion()}).
     *
     * @return The result region
     */
    private REGION_TYPE getResultRegionIfSupplied() {
        return resultRegion;
    }

    @Override
    @OverridingMethodsMustInvokeSuper
    public void releaseCachedResources() {
        DeferredColumnRegion.super.releaseCachedResources();
        final REGION_TYPE localResultRegion = getResultRegionIfSupplied();
        if (localResultRegion != null) {
            localResultRegion.releaseCachedResources();
        }
    }

    @Override
    public ChunkType getChunkType() {
        return getResultRegion().getChunkType();
    }

    @Override
    public void fillChunk(@NotNull FillContext context, @NotNull WritableChunk destination,
            @NotNull RowSequence rowSequence) {
        getResultRegion().fillChunk(context, destination, rowSequence);
    }

    @Override
    public void fillChunkAppend(
            @NotNull final FillContext context,
            @NotNull final WritableChunk destination,
            @NotNull final RowSequence.Iterator rowSequenceIterator) {
        getResultRegion().fillChunkAppend(context, destination, rowSequenceIterator);
    }

    @Override
    public Chunk getChunk(@NotNull GetContext context, @NotNull RowSequence rowSequence) {
        return getResultRegion().getChunk(context, rowSequence);
    }

    @Override
    public Chunk getChunk(@NotNull GetContext context, long firstKey, long lastKey) {
        return getResultRegion().getChunk(context, firstKey, lastKey);
    }
}