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Create a GrpcApiApplication That Exposes a Blink Table of Export Stat…
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80
server/src/main/java/io/deephaven/server/grpc_api_app/GrpcApiApplication.java
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| package io.deephaven.server.grpc_api_app; | ||
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| import com.google.auto.service.AutoService; | ||
| import io.deephaven.appmode.ApplicationState; | ||
| import io.deephaven.engine.context.ExecutionContext; | ||
| import io.deephaven.engine.table.Table; | ||
| import io.deephaven.engine.table.impl.sources.ring.RingTableTools; | ||
| import io.deephaven.engine.util.TableTools; | ||
| import io.deephaven.proto.backplane.grpc.ExportNotification; | ||
| import io.deephaven.server.session.SessionState; | ||
| import io.deephaven.stream.StreamToBlinkTableAdapter; | ||
| import io.grpc.stub.StreamObserver; | ||
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| /** | ||
| * The {@value APP_NAME}, application id {@value APP_ID}, produces stream {@link io.deephaven.engine.table.Table tables} | ||
| * {@value NOTIFICATION_INFO}; and derived table {@value NOTIFICATION_INFO_RING}. This data is modeled after the | ||
| * {@link ExportNotification} event information from {@link SessionState#addExportListener(StreamObserver)}. | ||
| * | ||
| * @see #ENABLED | ||
| * @see #RING_SIZE | ||
| */ | ||
| @AutoService(ApplicationState.Factory.class) | ||
| public final class GrpcApiApplication implements ApplicationState.Factory { | ||
| private static final String APP_ID = "GRPC_API_APP"; | ||
| private static final String APP_NAME = "GRPC API Application"; | ||
| private static final String NOTIFICATION_INFO = "session_export_notification_info"; | ||
| private static final String NOTIFICATION_INFO_RING = "session_export_notification_info_ring"; | ||
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| private static final String ENABLED = "enabled"; | ||
| private static final String RING_SIZE = "ringSize"; | ||
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| private static Table updateStreamTable = TableTools.emptyTable(0); | ||
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| public static Table getExportObjectUpdateStreamTable() { | ||
| return updateStreamTable; | ||
| } | ||
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| /** | ||
| * Looks up the system property {@value ENABLED}, defaults to {@code false}. | ||
| * | ||
| * @return if the gRPC API application is enabled | ||
| */ | ||
| private static boolean enabled() { | ||
| return "true".equals(System.getProperty(GrpcApiApplication.class + "." + ENABLED, "false")); | ||
| } | ||
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| /** | ||
| * Looks up the system property {@value RING_SIZE}, defaults to {@code 1024}. The | ||
| * {@value NOTIFICATION_INFO_RING} table is disabled when {@code 0} or less. | ||
| * | ||
| * @return the {@value NOTIFICATION_INFO_RING} table size | ||
| */ | ||
| private static int ringSize() { | ||
| return Integer.getInteger(GrpcApiApplication.class + "." + RING_SIZE, 1024); | ||
| } | ||
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| @Override | ||
| public ApplicationState create(ApplicationState.Listener listener) { | ||
| final ApplicationState state = new ApplicationState(listener, APP_ID, APP_NAME); | ||
| if (!enabled()) { | ||
| return state; | ||
| } | ||
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| final SessionStateExportObjectUpdateStream updateStream = new SessionStateExportObjectUpdateStream(); | ||
| SessionState.LISTENER = updateStream::onExportObjectStateUpdate; | ||
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| // noinspection resource | ||
| final StreamToBlinkTableAdapter adapter = new StreamToBlinkTableAdapter( | ||
| SessionStateExportObjectUpdateStream.definition(), updateStream, | ||
| ExecutionContext.getContext().getUpdateGraph(), NOTIFICATION_INFO); | ||
| updateStreamTable = adapter.table(); | ||
| state.setField(NOTIFICATION_INFO, updateStreamTable); | ||
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| final int ringSize = ringSize(); | ||
| if (ringSize > 0) { | ||
| state.setField(NOTIFICATION_INFO_RING, RingTableTools.of(updateStreamTable, ringSize)); | ||
| } | ||
| return state; | ||
| } | ||
| } |
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