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* Licensed to the Apache Software Foundation (ASF) under one
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* 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.graph;
import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.common.aggregators.Aggregator;
import org.apache.flink.graph.spargel.GatherFunction;
import org.apache.flink.util.Preconditions;
import java.util.HashMap;
import java.util.Map;
/**
* This is used as a base class for vertex-centric iteration or gather-sum-apply iteration
* configuration.
*/
public abstract class IterationConfiguration {
// the iteration name
private String name;
// the iteration parallelism
private int parallelism = -1;
// the iteration aggregators
private Map> aggregators = new HashMap<>();
// flag that defines whether the solution set is kept in managed memory
private boolean unmanagedSolutionSet = false;
// flag that defines whether the number of vertices option is set
private boolean optNumVertices = false;
public IterationConfiguration() {}
/**
* Sets the name for the iteration. The name is displayed in logs and messages.
*
* @param name The name for the iteration.
*/
public void setName(String name) {
this.name = name;
}
/**
* Gets the name of the iteration.
*
* @param defaultName
* @return The name of the iteration.
*/
public String getName(String defaultName) {
if (name != null) {
return name;
} else {
return defaultName;
}
}
/**
* Sets the parallelism for the iteration.
*
* @param parallelism The parallelism.
*/
public void setParallelism(int parallelism) {
Preconditions.checkArgument(
parallelism > 0 || parallelism == ExecutionConfig.PARALLELISM_DEFAULT,
"The parallelism must be at least one, or ExecutionConfig.PARALLELISM_DEFAULT (use system default).");
this.parallelism = parallelism;
}
/**
* Gets the iteration's parallelism.
*
* @return The iterations parallelism, or -1, if not set.
*/
public int getParallelism() {
return parallelism;
}
/**
* Defines whether the solution set is kept in managed memory (Flink's internal way of keeping
* object in serialized form) or as a simple object map. By default, the solution set runs in
* managed memory.
*
* @param unmanaged True, to keep the solution set in unmanaged memory, false otherwise.
*/
public void setSolutionSetUnmanagedMemory(boolean unmanaged) {
this.unmanagedSolutionSet = unmanaged;
}
/**
* Gets whether the solution set is kept in managed memory (Flink's internal way of keeping
* object in serialized form) or as a simple object map. By default, the solution set runs in
* managed memory.
*
* @return True, if the solution set is in unmanaged memory, false otherwise.
*/
public boolean isSolutionSetUnmanagedMemory() {
return this.unmanagedSolutionSet;
}
/**
* Gets whether the number of vertices option is set. By default, the number of vertices option
* is not set.
*
* @return True, if the number of vertices option is set, false otherwise.
*/
public boolean isOptNumVertices() {
return optNumVertices;
}
/**
* Sets the number of vertices option. By default, the number of vertices option is not set.
*
* @param optNumVertices True, to set this option, false otherwise.
*/
public void setOptNumVertices(boolean optNumVertices) {
this.optNumVertices = optNumVertices;
}
/**
* Registers a new aggregator. Aggregators registered here are available during the execution of
* the vertex updates via {@link GatherFunction#getIterationAggregator(String)} and {@link
* GatherFunction#getPreviousIterationAggregate(String)}.
*
* @param name The name of the aggregator, used to retrieve it and its aggregates during
* execution.
* @param aggregator The aggregator.
*/
public void registerAggregator(String name, Aggregator aggregator) {
this.aggregators.put(name, aggregator);
}
/**
* Gets the set of aggregators that are registered for this vertex-centric iteration.
*
* @return a Map of the registered aggregators, where the key is the aggregator name and the
* value is the Aggregator object
*/
public Map> getAggregators() {
return this.aggregators;
}
}