flink-runtime/src/main/java/org/apache/flink/runtime/operators/TaskContext.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.flink.runtime.operators;

import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.common.typeutils.TypeComparator;
import org.apache.flink.api.common.typeutils.TypeSerializerFactory;
import org.apache.flink.metrics.groups.OperatorMetricGroup;
import org.apache.flink.runtime.io.disk.iomanager.IOManager;
import org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable;
import org.apache.flink.runtime.memory.MemoryManager;
import org.apache.flink.runtime.operators.util.TaskConfig;
import org.apache.flink.runtime.taskmanager.TaskManagerRuntimeInfo;
import org.apache.flink.util.Collector;
import org.apache.flink.util.MutableObjectIterator;

/**
 * The task context gives a driver (e.g., {@link MapDriver}, or {@link JoinDriver}) access to the
 * runtime components and configuration that they can use to fulfil their task.
 *
 * @param <S> The UDF type.
 * @param <OT> The produced data type.
 * @see Driver
 */
public interface TaskContext<S, OT> {

    TaskConfig getTaskConfig();

    TaskManagerRuntimeInfo getTaskManagerInfo();

    ClassLoader getUserCodeClassLoader();

    MemoryManager getMemoryManager();

    IOManager getIOManager();

    <X> MutableObjectIterator<X> getInput(int index);

    <X> TypeSerializerFactory<X> getInputSerializer(int index);

    <X> TypeComparator<X> getDriverComparator(int index);

    S getStub();

    ExecutionConfig getExecutionConfig();

    Collector<OT> getOutputCollector();

    AbstractInvokable getContainingTask();

    String formatLogString(String message);

    OperatorMetricGroup getMetricGroup();
}