| /* |
| * 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.wayang.jdbc.channels; |
| |
| import org.apache.wayang.core.optimizer.OptimizationContext; |
| import org.apache.wayang.core.plan.executionplan.Channel; |
| import org.apache.wayang.core.plan.executionplan.ExecutionTask; |
| import org.apache.wayang.core.plan.wayangplan.ExecutionOperator; |
| import org.apache.wayang.core.plan.wayangplan.OutputSlot; |
| import org.apache.wayang.core.platform.AbstractChannelInstance; |
| import org.apache.wayang.core.platform.ChannelDescriptor; |
| import org.apache.wayang.core.platform.ChannelInstance; |
| import org.apache.wayang.core.platform.Executor; |
| import org.apache.wayang.core.platform.Platform; |
| import org.apache.wayang.jdbc.platform.JdbcPlatformTemplate; |
| |
| import java.util.Objects; |
| |
| /** |
| * Implementation of a {@link Channel} that is given by a SQL query. |
| */ |
| public class SqlQueryChannel extends Channel { |
| |
| public SqlQueryChannel(ChannelDescriptor descriptor, OutputSlot<?> outputSlot) { |
| super(descriptor, outputSlot); |
| } |
| |
| private SqlQueryChannel(SqlQueryChannel parent) { |
| super(parent); |
| } |
| |
| @Override |
| public SqlQueryChannel copy() { |
| return new SqlQueryChannel(this); |
| } |
| |
| @Override |
| public SqlQueryChannel.Instance createInstance(Executor executor, |
| OptimizationContext.OperatorContext producerOperatorContext, |
| int producerOutputIndex) { |
| return new Instance(executor, producerOperatorContext, producerOutputIndex); |
| } |
| |
| /** |
| * {@link ChannelInstance} implementation for {@link SqlQueryChannel}s. |
| */ |
| public class Instance extends AbstractChannelInstance { |
| |
| private String sqlQuery = null; |
| |
| /** |
| * Creates a new instance and registers it with its {@link Executor}. |
| * |
| * @param executor that maintains this instance |
| * @param producerOperatorContext the {@link OptimizationContext.OperatorContext} for the producing |
| * {@link ExecutionOperator} |
| * @param producerOutputIndex the output index of the producer {@link ExecutionTask} |
| */ |
| protected Instance(Executor executor, OptimizationContext.OperatorContext producerOperatorContext, int producerOutputIndex) { |
| super(executor, producerOperatorContext, producerOutputIndex); |
| } |
| |
| @Override |
| public SqlQueryChannel getChannel() { |
| return SqlQueryChannel.this; |
| } |
| |
| @Override |
| protected void doDispose() throws Throwable { |
| // Nothing to do. |
| } |
| |
| public void setSqlQuery(String sqlQuery) { |
| this.sqlQuery = sqlQuery; |
| } |
| |
| public String getSqlQuery() { |
| return this.sqlQuery; |
| } |
| } |
| |
| /** |
| * Describes a specific class of {@link SqlQueryChannel}s belonging to a certain {@link JdbcPlatformTemplate}. |
| */ |
| public static class Descriptor extends ChannelDescriptor { |
| |
| /** |
| * {@link Platform} to which corresponding {@link Channel}s belong. |
| */ |
| private final JdbcPlatformTemplate platform; |
| |
| public Descriptor(JdbcPlatformTemplate platform) { |
| super(SqlQueryChannel.class, false, false); |
| this.platform = platform; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| if (!super.equals(o)) return false; |
| Descriptor that = (Descriptor) o; |
| return Objects.equals(platform, that.platform); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(super.hashCode(), platform); |
| } |
| } |
| } |