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/*
 * 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.deployment;

import org.apache.flink.runtime.io.network.ConnectionID;

import java.io.Serializable;

import static org.apache.flink.util.Preconditions.checkNotNull;

/**
 * Location of a result partition from the perspective of the consuming task.
 *
 * 

The location indicates both the instance, on which the partition is produced and the state of * the producing task. There are three possibilities: * *

    *
  1. Local: The partition is available at the same instance on which the * consuming task is (being) deployed and the producing task has registered the result partition. * *
  2. Remote: The result partition is available at a different instance from the * one, on which the consuming task is (being) deployed and the producing task has registered the * result partition. * *
  3. Unknown: The producing task has not yet registered the result partition. * When deploying the consuming task, the instance might be known or unknown. In any case, the * consuming task cannot request it yet. Instead, it will be updated at runtime after the * producing task is guaranteed to have registered the partition. A producing task is guaranteed * to have registered the partition after its state has switched to running. *
*/ public class ResultPartitionLocation implements Serializable { private static final long serialVersionUID = -6354238166937194463L; /** The type of location for the result partition. */ private final LocationType locationType; /** The connection ID of a remote result partition. */ private final ConnectionID connectionId; private enum LocationType { LOCAL, REMOTE, UNKNOWN } private ResultPartitionLocation(LocationType locationType, ConnectionID connectionId) { this.locationType = checkNotNull(locationType); this.connectionId = connectionId; } public static ResultPartitionLocation createRemote(ConnectionID connectionId) { return new ResultPartitionLocation(LocationType.REMOTE, checkNotNull(connectionId)); } public static ResultPartitionLocation createLocal() { return new ResultPartitionLocation(LocationType.LOCAL, null); } public static ResultPartitionLocation createUnknown() { return new ResultPartitionLocation(LocationType.UNKNOWN, null); } // ------------------------------------------------------------------------ public boolean isLocal() { return locationType == LocationType.LOCAL; } public boolean isRemote() { return locationType == LocationType.REMOTE; } public boolean isUnknown() { return locationType == LocationType.UNKNOWN; } public ConnectionID getConnectionId() { return connectionId; } @Override public String toString() { return "ResultPartitionLocation [" + locationType + (isRemote() ? " [" + connectionId + "]]" : "]"); } }




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