| /* |
| * 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.operator.source; |
| |
| import org.apache.iotdb.db.queryengine.execution.exchange.source.ISourceHandle; |
| import org.apache.iotdb.db.queryengine.execution.operator.OperatorContext; |
| import org.apache.iotdb.db.queryengine.plan.planner.plan.node.PlanNodeId; |
| import org.apache.iotdb.tsfile.common.conf.TSFileDescriptor; |
| import org.apache.iotdb.tsfile.read.common.block.TsBlock; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| import com.google.common.util.concurrent.SettableFuture; |
| |
| public class ExchangeOperator implements SourceOperator { |
| |
| private final OperatorContext operatorContext; |
| |
| private final ISourceHandle sourceHandle; |
| |
| private final PlanNodeId sourceId; |
| |
| private ListenableFuture<?> isBlocked = NOT_BLOCKED; |
| |
| private long maxReturnSize = |
| TSFileDescriptor.getInstance().getConfig().getMaxTsBlockSizeInBytes(); |
| |
| private SettableFuture<Void> blockedDependencyDriver = null; |
| |
| public ExchangeOperator( |
| OperatorContext operatorContext, ISourceHandle sourceHandle, PlanNodeId sourceId) { |
| this.operatorContext = operatorContext; |
| this.sourceHandle = sourceHandle; |
| this.sourceId = sourceId; |
| } |
| |
| /** |
| * For ExchangeOperator in pipeline, the maxReturnSize is equal to the maxReturnSize of the child |
| * operator. |
| * |
| * @param maxReturnSize max return size of child operator |
| */ |
| public ExchangeOperator( |
| OperatorContext operatorContext, |
| ISourceHandle sourceHandle, |
| PlanNodeId sourceId, |
| long maxReturnSize) { |
| this.operatorContext = operatorContext; |
| this.sourceHandle = sourceHandle; |
| this.sourceId = sourceId; |
| this.maxReturnSize = maxReturnSize; |
| } |
| |
| @Override |
| public OperatorContext getOperatorContext() { |
| return operatorContext; |
| } |
| |
| @Override |
| public TsBlock next() throws Exception { |
| return sourceHandle.receive(); |
| } |
| |
| @Override |
| public boolean hasNext() throws Exception { |
| return !sourceHandle.isFinished(); |
| } |
| |
| @Override |
| public boolean isFinished() throws Exception { |
| return sourceHandle.isFinished(); |
| } |
| |
| @Override |
| public long calculateMaxPeekMemory() { |
| return maxReturnSize; |
| } |
| |
| @Override |
| public long calculateMaxReturnSize() { |
| return maxReturnSize; |
| } |
| |
| @Override |
| public long calculateRetainedSizeAfterCallingNext() { |
| return 0L; |
| } |
| |
| @Override |
| public PlanNodeId getSourceId() { |
| return sourceId; |
| } |
| |
| public ISourceHandle getSourceHandle() { |
| return sourceHandle; |
| } |
| |
| @Override |
| public ListenableFuture<?> isBlocked() { |
| // Avoid registering a new callback in the source handle when one is already pending |
| if (isBlocked.isDone()) { |
| isBlocked = sourceHandle.isBlocked(); |
| if (isBlocked.isDone()) { |
| isBlocked = NOT_BLOCKED; |
| } |
| } |
| return isBlocked; |
| } |
| |
| @Override |
| public void close() throws Exception { |
| sourceHandle.close(); |
| if (blockedDependencyDriver != null) { |
| blockedDependencyDriver.set(null); |
| } |
| } |
| |
| public SettableFuture<Void> getBlockedDependencyDriver() { |
| if (blockedDependencyDriver == null) { |
| blockedDependencyDriver = SettableFuture.create(); |
| } |
| return blockedDependencyDriver; |
| } |
| } |