/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* Licensed 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 eu.stratosphere.pact.runtime.shipping;
/**
* Enumeration defining the different shipping types of the output, such as local forward, re-partitioning by hash,
* or re-partitioning by range.
*/
public enum ShipStrategyType {
/**
* Constant used as an indicator for an unassigned ship strategy.
*/
NONE(false, false, false),
/**
* Forwarding the data locally in memory.
*/
FORWARD(false, false, false),
/**
* Repartitioning the data randomly, typically when the degree of parallelism between two nodes changes.
*/
PARTITION_RANDOM(true, true, false),
/**
* Repartitioning the data deterministically through a hash function.
*/
PARTITION_HASH(true, true, true),
/**
* Repartitioning the data within a local instance with a hash function. Happens for example when the
* intra-node degree-of-parallelism is increased.
*/
PARTITION_LOCAL_HASH(false, true, true),
/**
* Partitioning the data in ranges according to a total order.
*/
PARTITION_RANGE(true, true, true),
/**
* Replicating the data set to all instances.
*/
BROADCAST(true, true, false);
// --------------------------------------------------------------------------------------------
private final boolean isNetwork;
private final boolean compensatesForLocalDOPChanges;
private final boolean requiresComparator;
private ShipStrategyType(boolean network, boolean compensatesForLocalDOPChanges, boolean requiresComparator) {
this.isNetwork = network;
this.compensatesForLocalDOPChanges = compensatesForLocalDOPChanges;
this.requiresComparator = requiresComparator;
}
public boolean isNetworkStrategy() {
return this.isNetwork;
}
public boolean compensatesForLocalDOPChanges() {
return this.compensatesForLocalDOPChanges;
}
public boolean requiresComparator() {
return this.requiresComparator;
}
}