| /* |
| * 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.schema; |
| |
| import org.apache.iotdb.commons.exception.runtime.SchemaExecutionException; |
| import org.apache.iotdb.commons.path.PartialPath; |
| import org.apache.iotdb.db.queryengine.common.header.ColumnHeader; |
| import org.apache.iotdb.db.queryengine.execution.driver.SchemaDriverContext; |
| import org.apache.iotdb.db.queryengine.execution.operator.OperatorContext; |
| import org.apache.iotdb.db.queryengine.execution.operator.schema.source.ISchemaSource; |
| import org.apache.iotdb.db.queryengine.execution.operator.source.SourceOperator; |
| import org.apache.iotdb.db.queryengine.plan.planner.plan.node.PlanNodeId; |
| import org.apache.iotdb.db.schemaengine.schemaregion.read.resp.info.ISchemaInfo; |
| import org.apache.iotdb.db.schemaengine.schemaregion.read.resp.reader.ISchemaReader; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| import com.google.common.util.concurrent.SettableFuture; |
| import org.apache.tsfile.common.conf.TSFileDescriptor; |
| import org.apache.tsfile.enums.TSDataType; |
| import org.apache.tsfile.read.common.block.TsBlock; |
| import org.apache.tsfile.read.common.block.TsBlockBuilder; |
| |
| import java.util.List; |
| import java.util.NoSuchElementException; |
| import java.util.stream.Collectors; |
| |
| import static com.google.common.util.concurrent.MoreExecutors.directExecutor; |
| |
| public class SchemaQueryScanOperator<T extends ISchemaInfo> implements SourceOperator { |
| private static final long DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES = |
| TSFileDescriptor.getInstance().getConfig().getMaxTsBlockSizeInBytes(); |
| private static final long MAX_SIZE = DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES; |
| |
| protected PlanNodeId sourceId; |
| |
| protected OperatorContext operatorContext; |
| |
| private final ISchemaSource<T> schemaSource; |
| |
| protected int limit; |
| protected int offset; |
| protected PartialPath partialPath; |
| protected boolean isPrefixPath; |
| |
| private String database; |
| |
| private final List<TSDataType> outputDataTypes; |
| |
| private ISchemaReader<T> schemaReader; |
| |
| private final TsBlockBuilder tsBlockBuilder; |
| private ListenableFuture<?> isBlocked; |
| private TsBlock next; |
| private boolean isFinished; |
| |
| public SchemaQueryScanOperator( |
| PlanNodeId sourceId, OperatorContext operatorContext, ISchemaSource<T> schemaSource) { |
| this.sourceId = sourceId; |
| this.operatorContext = operatorContext; |
| this.schemaSource = schemaSource; |
| this.outputDataTypes = |
| schemaSource.getInfoQueryColumnHeaders().stream() |
| .map(ColumnHeader::getColumnType) |
| .collect(Collectors.toList()); |
| this.tsBlockBuilder = new TsBlockBuilder(outputDataTypes); |
| } |
| |
| protected ISchemaReader<T> createSchemaReader() { |
| return schemaSource.getSchemaReader( |
| ((SchemaDriverContext) operatorContext.getDriverContext()).getSchemaRegion()); |
| } |
| |
| private void setColumns(T element, TsBlockBuilder builder) { |
| schemaSource.transformToTsBlockColumns(element, builder, getDatabase()); |
| } |
| |
| public PartialPath getPartialPath() { |
| return partialPath; |
| } |
| |
| public int getLimit() { |
| return limit; |
| } |
| |
| public int getOffset() { |
| return offset; |
| } |
| |
| public void setLimit(int limit) { |
| this.limit = limit; |
| } |
| |
| public void setOffset(int offset) { |
| this.offset = offset; |
| } |
| |
| public boolean isPrefixPath() { |
| return isPrefixPath; |
| } |
| |
| @Override |
| public OperatorContext getOperatorContext() { |
| return operatorContext; |
| } |
| |
| @Override |
| public ListenableFuture<?> isBlocked() { |
| if (isBlocked == null) { |
| isBlocked = tryGetNext(); |
| } |
| return isBlocked; |
| } |
| |
| /** |
| * Try to get next TsBlock. If the next is not ready, return a future. After success, {@link |
| * SchemaQueryScanOperator#next} will be set. |
| */ |
| private ListenableFuture<?> tryGetNext() { |
| if (schemaReader == null) { |
| schemaReader = createSchemaReader(); |
| } |
| while (true) { |
| try { |
| ListenableFuture<?> readerBlocked = schemaReader.isBlocked(); |
| if (!readerBlocked.isDone()) { |
| SettableFuture<?> settableFuture = SettableFuture.create(); |
| readerBlocked.addListener( |
| () -> { |
| next = tsBlockBuilder.build(); |
| tsBlockBuilder.reset(); |
| settableFuture.set(null); |
| }, |
| directExecutor()); |
| return settableFuture; |
| } else if (schemaReader.hasNext()) { |
| T element = schemaReader.next(); |
| setColumns(element, tsBlockBuilder); |
| if (tsBlockBuilder.getRetainedSizeInBytes() >= MAX_SIZE) { |
| next = tsBlockBuilder.build(); |
| tsBlockBuilder.reset(); |
| return NOT_BLOCKED; |
| } |
| } else { |
| if (tsBlockBuilder.isEmpty()) { |
| next = null; |
| isFinished = true; |
| } else { |
| next = tsBlockBuilder.build(); |
| } |
| tsBlockBuilder.reset(); |
| return NOT_BLOCKED; |
| } |
| } catch (Exception e) { |
| throw new SchemaExecutionException(e); |
| } |
| } |
| } |
| |
| @Override |
| public TsBlock next() throws Exception { |
| if (!hasNext()) { |
| throw new NoSuchElementException(); |
| } |
| TsBlock ret = next; |
| next = null; |
| isBlocked = null; |
| return ret; |
| } |
| |
| @Override |
| public boolean hasNext() throws Exception { |
| isBlocked().get(); // wait for the next TsBlock |
| if (!schemaReader.isSuccess()) { |
| throw new SchemaExecutionException(schemaReader.getFailure()); |
| } |
| return next != null; |
| } |
| |
| @Override |
| public boolean isFinished() throws Exception { |
| return isFinished; |
| } |
| |
| @Override |
| public PlanNodeId getSourceId() { |
| return sourceId; |
| } |
| |
| @Override |
| public long calculateMaxPeekMemory() { |
| return DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES; |
| } |
| |
| @Override |
| public long calculateMaxReturnSize() { |
| return DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES; |
| } |
| |
| @Override |
| public long calculateRetainedSizeAfterCallingNext() { |
| return 0L; |
| } |
| |
| protected String getDatabase() { |
| if (database == null) { |
| database = |
| ((SchemaDriverContext) operatorContext.getDriverContext()) |
| .getSchemaRegion() |
| .getDatabaseFullPath(); |
| } |
| return database; |
| } |
| |
| @Override |
| public void close() throws Exception { |
| if (schemaReader != null) { |
| schemaReader.close(); |
| schemaReader = null; |
| } |
| } |
| } |