feat: [WIP] Barrage Refactor Read/Write Chunk Factories and Default Type Mappings

engine/chunk/src/main/java/io/deephaven/chunk/BooleanChunk.java

@@ -7,6 +7,7 @@
 // @formatter:off
 package io.deephaven.chunk;
 
+import io.deephaven.util.QueryConstants;
 import io.deephaven.util.type.ArrayTypeUtils;
 import io.deephaven.chunk.attributes.Any;
 
@@ -74,6 +75,12 @@ public final boolean get(int index) {
         return data[offset + index];
     }
 
+    // region isNull
+    public final boolean isNull(int index) {
+        return false;
+    }
+    // endregion isNull
+
     @Override
     public BooleanChunk<ATTR> slice(int offset, int capacity) {
         ChunkHelpers.checkSliceArgs(size, offset, capacity);

engine/chunk/src/main/java/io/deephaven/chunk/ByteChunk.java

@@ -7,6 +7,7 @@
 // @formatter:off
 package io.deephaven.chunk;
 
+import io.deephaven.util.QueryConstants;
 import io.deephaven.util.type.ArrayTypeUtils;
 import io.deephaven.chunk.attributes.Any;
 
@@ -78,6 +79,12 @@ public final byte get(int index) {
         return data[offset + index];
     }
 
+    // region isNull
+    public final boolean isNull(int index) {
+        return data[offset + index] == QueryConstants.NULL_BYTE;
+    }
+    // endregion isNull
+
     @Override
     public ByteChunk<ATTR> slice(int offset, int capacity) {
         ChunkHelpers.checkSliceArgs(size, offset, capacity);

engine/chunk/src/main/java/io/deephaven/chunk/CharChunk.java

@@ -3,6 +3,7 @@
 //
 package io.deephaven.chunk;
 
+import io.deephaven.util.QueryConstants;
 import io.deephaven.util.type.ArrayTypeUtils;
 import io.deephaven.chunk.attributes.Any;
 
@@ -73,6 +74,12 @@ public final char get(int index) {
         return data[offset + index];
     }
 
+    // region isNull
+    public final boolean isNull(int index) {
+        return data[offset + index] == QueryConstants.NULL_CHAR;
+    }
+    // endregion isNull
+
     @Override
     public CharChunk<ATTR> slice(int offset, int capacity) {
         ChunkHelpers.checkSliceArgs(size, offset, capacity);

engine/chunk/src/main/java/io/deephaven/chunk/DoubleChunk.java

@@ -7,6 +7,7 @@
 // @formatter:off
 package io.deephaven.chunk;
 
+import io.deephaven.util.QueryConstants;
 import io.deephaven.util.type.ArrayTypeUtils;
 import io.deephaven.chunk.attributes.Any;
 
@@ -77,6 +78,12 @@ public final double get(int index) {
         return data[offset + index];
     }
 
+    // region isNull
+    public final boolean isNull(int index) {
+        return data[offset + index] == QueryConstants.NULL_DOUBLE;
+    }
+    // endregion isNull
+
     @Override
     public DoubleChunk<ATTR> slice(int offset, int capacity) {
         ChunkHelpers.checkSliceArgs(size, offset, capacity);

engine/chunk/src/main/java/io/deephaven/chunk/FloatChunk.java

@@ -7,6 +7,7 @@
 // @formatter:off
 package io.deephaven.chunk;
 
+import io.deephaven.util.QueryConstants;
 import io.deephaven.util.type.ArrayTypeUtils;
 import io.deephaven.chunk.attributes.Any;
 
@@ -77,6 +78,12 @@ public final float get(int index) {
         return data[offset + index];
     }
 
+    // region isNull
+    public final boolean isNull(int index) {
+        return data[offset + index] == QueryConstants.NULL_FLOAT;
+    }
+    // endregion isNull
+
     @Override
     public FloatChunk<ATTR> slice(int offset, int capacity) {
         ChunkHelpers.checkSliceArgs(size, offset, capacity);

engine/chunk/src/main/java/io/deephaven/chunk/IntChunk.java

@@ -7,6 +7,7 @@
 // @formatter:off
 package io.deephaven.chunk;
 
+import io.deephaven.util.QueryConstants;
 import io.deephaven.util.type.ArrayTypeUtils;
 import io.deephaven.chunk.attributes.Any;
 
@@ -77,6 +78,12 @@ public final int get(int index) {
         return data[offset + index];
     }
 
+    // region isNull
+    public final boolean isNull(int index) {
+        return data[offset + index] == QueryConstants.NULL_INT;
+    }
+    // endregion isNull
+
     @Override
     public IntChunk<ATTR> slice(int offset, int capacity) {
         ChunkHelpers.checkSliceArgs(size, offset, capacity);

engine/chunk/src/main/java/io/deephaven/chunk/LongChunk.java

@@ -7,6 +7,7 @@
 // @formatter:off
 package io.deephaven.chunk;
 
+import io.deephaven.util.QueryConstants;
 import io.deephaven.util.type.ArrayTypeUtils;
 import io.deephaven.chunk.attributes.Any;
 
@@ -77,6 +78,12 @@ public final long get(int index) {
         return data[offset + index];
     }
 
+    // region isNull
+    public final boolean isNull(int index) {
+        return data[offset + index] == QueryConstants.NULL_LONG;
+    }
+    // endregion isNull
+
     @Override
     public LongChunk<ATTR> slice(int offset, int capacity) {
         ChunkHelpers.checkSliceArgs(size, offset, capacity);

engine/chunk/src/main/java/io/deephaven/chunk/ObjectChunk.java

@@ -7,6 +7,7 @@
 // @formatter:off
 package io.deephaven.chunk;
 
+import io.deephaven.util.QueryConstants;
 import io.deephaven.util.type.ArrayTypeUtils;
 import io.deephaven.chunk.attributes.Any;
 
@@ -77,6 +78,12 @@ public final T get(int index) {
         return data[offset + index];
     }
 
+    // region isNull
+    public final boolean isNull(int index) {
+        return data[offset + index] == null;
+    }
+    // endregion isNull
+
     @Override
     public ObjectChunk<T, ATTR> slice(int offset, int capacity) {
         ChunkHelpers.checkSliceArgs(size, offset, capacity);

engine/chunk/src/main/java/io/deephaven/chunk/ShortChunk.java

@@ -7,6 +7,7 @@
 // @formatter:off
 package io.deephaven.chunk;
 
+import io.deephaven.util.QueryConstants;
 import io.deephaven.util.type.ArrayTypeUtils;
 import io.deephaven.chunk.attributes.Any;
 
@@ -77,6 +78,12 @@ public final short get(int index) {
         return data[offset + index];
     }
 
+    // region isNull
+    public final boolean isNull(int index) {
+        return data[offset + index] == QueryConstants.NULL_SHORT;
+    }
+    // endregion isNull
+
     @Override
     public ShortChunk<ATTR> slice(int offset, int capacity) {
         ChunkHelpers.checkSliceArgs(size, offset, capacity);

engine/table/src/main/java/io/deephaven/engine/table/impl/preview/ArrayPreview.java

@@ -3,6 +3,7 @@
 //
 package io.deephaven.engine.table.impl.preview;
 
+import io.deephaven.util.type.TypeUtils;
 import io.deephaven.vector.Vector;
 import io.deephaven.vector.VectorFactory;
 import org.jetbrains.annotations.NotNull;
@@ -34,7 +35,9 @@ public static ArrayPreview fromArray(final Object array) {
         if (componentType == boolean.class) {
             return new ArrayPreview(convertToString((boolean[]) array));
         }
-        return new ArrayPreview(VectorFactory.forElementType(componentType)
+        // Boxed primitives need the Object wrapper.
+        final Class<?> elementType = TypeUtils.isBoxedType(componentType) ? Object.class : componentType;
+        return new ArrayPreview(VectorFactory.forElementType(elementType)
                 .vectorWrap(array)
                 .toString(ARRAY_SIZE_CUTOFF));
     }

engine/table/src/main/java/io/deephaven/engine/table/impl/sources/ReinterpretUtils.java

@@ -265,6 +265,7 @@ public static ChunkType maybeConvertToWritablePrimitiveChunkType(@NotNull final
         }
         if (dataType == Instant.class) {
             // Note that storing ZonedDateTime as a primitive is lossy on the time zone.
+            // TODO (https://github.com/deephaven/deephaven-core/issues/5241): Inconsistent handling of ZonedDateTime
             return ChunkType.Long;
         }
         return ChunkType.fromElementType(dataType);
@@ -283,6 +284,8 @@ public static Class<?> maybeConvertToPrimitiveDataType(@NotNull final Class<?> d
             return byte.class;
         }
         if (dataType == Instant.class || dataType == ZonedDateTime.class) {
+            // Note: not all ZonedDateTime sources are convertible to long, so this doesn't match column source behavior
+            // TODO (https://github.com/deephaven/deephaven-core/issues/5241): Inconsistent handling of ZonedDateTime
             return long.class;
         }
         return dataType;

extensions/barrage/src/main/java/io/deephaven/extensions/barrage/BarrageStreamGenerator.java → extensions/barrage/src/main/java/io/deephaven/extensions/barrage/BarrageMessageWriter.java

@@ -4,8 +4,11 @@
 package io.deephaven.extensions.barrage;
 
 import com.google.flatbuffers.FlatBufferBuilder;
+import io.deephaven.chunk.Chunk;
+import io.deephaven.chunk.attributes.Values;
 import io.deephaven.engine.rowset.RowSet;
 import io.deephaven.engine.table.impl.util.BarrageMessage;
+import io.deephaven.extensions.barrage.chunk.ChunkWriter;
 import io.deephaven.extensions.barrage.util.DefensiveDrainable;
 import io.deephaven.util.SafeCloseable;
 import org.jetbrains.annotations.NotNull;
@@ -17,10 +20,10 @@
 import java.util.function.ToIntFunction;
 
 /**
- * A StreamGenerator takes a BarrageMessage and re-uses portions of the serialized payload across different subscribers
- * that may subscribe to different viewports and columns.
+ * A {@code BarrageMessageWriter} takes a {@link BarrageMessage} and re-uses portions of the serialized payload across
+ * different subscribers that may subscribe to different viewports and columns.
  */
-public interface BarrageStreamGenerator extends SafeCloseable {
+public interface BarrageMessageWriter extends SafeCloseable {
 
     /**
      * Represents a single update, which might be sent as multiple distinct payloads as necessary based in the
@@ -32,16 +35,18 @@ interface MessageView {
 
     interface Factory {
         /**
-         * Create a StreamGenerator that now owns the BarrageMessage.
+         * Create a {@code BarrageMessageWriter} that now owns the {@link BarrageMessage}.
          *
          * @param message the message that contains the update that we would like to propagate
          * @param metricsConsumer a method that can be used to record write metrics
          */
-        BarrageStreamGenerator newGenerator(
-                BarrageMessage message, BarragePerformanceLog.WriteMetricsConsumer metricsConsumer);
+        BarrageMessageWriter newMessageWriter(
+                @NotNull BarrageMessage message,
+                @NotNull ChunkWriter<Chunk<Values>>[] chunkWriters,
+                @NotNull BarragePerformanceLog.WriteMetricsConsumer metricsConsumer);
 
         /**
-         * Create a MessageView of the Schema to send as the initial message to a new subscriber.
+         * Create a {@link MessageView} of the Schema to send as the initial message to a new subscriber.
          *
          * @param schemaPayloadWriter a function that writes schema data to a {@link FlatBufferBuilder} and returns the
          *        schema offset
@@ -51,21 +56,22 @@ BarrageStreamGenerator newGenerator(
     }
 
     /**
-     * @return the BarrageMessage that this generator is operating on
+     * @return the {@link BarrageMessage} that this writer is operating on
      */
     BarrageMessage getMessage();
 
     /**
-     * Obtain a Full-Subscription View of this StreamGenerator that can be sent to a single subscriber.
+     * Obtain a Full-Subscription {@link MessageView} of this {@code BarrageMessageWriter} that can be sent to a single
+     * subscriber.
      *
      * @param options serialization options for this specific view
-     * @param isInitialSnapshot indicates whether or not this is the first snapshot for the listener
+     * @param isInitialSnapshot indicates whether this is the first snapshot for the listener
      * @return a MessageView filtered by the subscription properties that can be sent to that subscriber
      */
     MessageView getSubView(BarrageSubscriptionOptions options, boolean isInitialSnapshot);
 
     /**
-     * Obtain a View of this StreamGenerator that can be sent to a single subscriber.
+     * Obtain a {@link MessageView} of this {@code BarrageMessageWriter} that can be sent to a single subscriber.
      *
      * @param options serialization options for this specific view
      * @param isInitialSnapshot indicates whether or not this is the first snapshot for the listener
@@ -79,15 +85,16 @@ MessageView getSubView(BarrageSubscriptionOptions options, boolean isInitialSnap
             boolean reverseViewport, @Nullable RowSet keyspaceViewport, BitSet subscribedColumns);
 
     /**
-     * Obtain a Full-Snapshot View of this StreamGenerator that can be sent to a single requestor.
+     * Obtain a Full-Snapshot {@link MessageView} of this {@code BarrageMessageWriter} that can be sent to a single
+     * requestor.
      *
      * @param options serialization options for this specific view
      * @return a MessageView filtered by the snapshot properties that can be sent to that requestor
      */
     MessageView getSnapshotView(BarrageSnapshotOptions options);
 
     /**
-     * Obtain a View of this StreamGenerator that can be sent to a single requestor.
+     * Obtain a {@link MessageView} of this {@code BarrageMessageWriter} that can be sent to a single requestor.
      *
      * @param options serialization options for this specific view
      * @param viewport is the position-space viewport