/*
* 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.flink.runtime.operators.chaining;
import org.apache.flink.api.common.functions.Function;
import org.apache.flink.api.common.functions.RuntimeContext;
import org.apache.flink.runtime.execution.Environment;
import org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable;
import org.apache.flink.runtime.operators.RegularPactTask;
import org.apache.flink.runtime.operators.util.DistributedRuntimeUDFContext;
import org.apache.flink.runtime.operators.util.TaskConfig;
import org.apache.flink.util.Collector;
/**
* The interface to be implemented by drivers that do not run in an own pact task context, but are chained to other
* tasks.
*/
public abstract class ChainedDriver<IT, OT> implements Collector<IT> {
protected TaskConfig config;
protected String taskName;
protected Collector<OT> outputCollector;
protected ClassLoader userCodeClassLoader;
private DistributedRuntimeUDFContext udfContext;
public void setup(TaskConfig config, String taskName, Collector<OT> outputCollector,
AbstractInvokable parent, ClassLoader userCodeClassLoader)
{
this.config = config;
this.taskName = taskName;
this.outputCollector = outputCollector;
this.userCodeClassLoader = userCodeClassLoader;
if (parent instanceof RegularPactTask) {
this.udfContext = ((RegularPactTask<?, ?>) parent).createRuntimeContext(taskName);
} else {
Environment env = parent.getEnvironment();
this.udfContext = new DistributedRuntimeUDFContext(taskName, env.getCurrentNumberOfSubtasks(),
env.getIndexInSubtaskGroup(), userCodeClassLoader, env.getCopyTask());
}
setup(parent);
}
public abstract void setup(AbstractInvokable parent);
public abstract void openTask() throws Exception;
public abstract void closeTask() throws Exception;
public abstract void cancelTask();
public abstract Function getStub();
public abstract String getTaskName();
@Override
public abstract void collect(IT record);
protected RuntimeContext getUdfRuntimeContext() {
return this.udfContext;
}
@SuppressWarnings("unchecked")
public void setOutputCollector(Collector<?> outputCollector) {
this.outputCollector = (Collector<OT>) outputCollector;
}
public Collector<OT> getOutputCollector() {
return outputCollector;
}
public TaskConfig getTaskConfig() {
return this.config;
}
}