iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/exchange/source/ISourceHandle.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.iotdb.db.queryengine.execution.exchange.source;

import org.apache.iotdb.commons.exception.IoTDBException;
import org.apache.iotdb.mpp.rpc.thrift.TFragmentInstanceId;
import org.apache.iotdb.tsfile.read.common.block.TsBlock;

import com.google.common.util.concurrent.ListenableFuture;

import java.nio.ByteBuffer;

public interface ISourceHandle {

  /** Get the local fragment instance ID that this source handle belongs to. */
  TFragmentInstanceId getLocalFragmentInstanceId();

  /** Get the local plan node ID that this source handle belongs to. */
  String getLocalPlanNodeId();

  /** Get the total amount of memory used by buffered tsblocks. */
  long getBufferRetainedSizeInBytes();

  /**
   * Get a {@link TsBlock}. If the source handle is blocked, a null will be returned. A {@link
   * RuntimeException} will be thrown if any error happened.
   */
  TsBlock receive();

  /**
   * Get the serialized {@link TsBlock} as the form of bytebuffer. This method share the same
   * iterator with receive(). When one of these two methods is called, the cursor in iterator will
   * forward.
   *
   * @throws IoTDBException throw IoTDBException
   */
  ByteBuffer getSerializedTsBlock() throws IoTDBException;

  /** If there are more TsBlocks. */
  boolean isFinished();

  /** Get a future that will be completed when the input buffer is not empty. */
  @SuppressWarnings("squid:S1452")
  ListenableFuture<?> isBlocked();

  /** If this handle is aborted. */
  boolean isAborted();

  /**
   * Abort the handle. Discard all tsblocks which may still be in the memory buffer and cancel the
   * future returned by {@link #isBlocked()}.
   *
   * <p>Should only be called in abnormal case
   */
  void abort();

  /**
   * Abort the handle. Discard all tsblocks which may still be in the memory buffer and cancel the
   * future returned by {@link #isBlocked()}.
   *
   * <p>Should only be called in abnormal case
   */
  void abort(Throwable t);

  /**
   * Close the handle. Discard all tsblocks which may still be in the memory buffer and complete the
   * future returned by {@link #isBlocked()}.
   *
   * <p>Should only be called in normal case
   */
  void close();

  /** Set max bytes this handle can reserve from memory pool. */
  void setMaxBytesCanReserve(long maxBytesCanReserve);
}