/***********************************************************************************************************************
* 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.nephele.executiongraph;
import java.util.Collection;
import java.util.concurrent.CopyOnWriteArrayList;
import eu.stratosphere.runtime.io.gates.GateID;
import eu.stratosphere.runtime.io.channels.ChannelType;
/**
* Objects of this class represent either an {@link InputGate} or {@link OutputGate} within an {@link ExecutionGraph},
* Nephele's internal scheduling representation for jobs.
* <p>
* This class is thread-safe.
*
*/
public final class ExecutionGate {
private final GateID gateID;
private volatile ExecutionVertex vertex;
private final ExecutionGroupEdge groupEdge;
private final boolean isInputGate;
private final CopyOnWriteArrayList<ExecutionEdge> edges = new CopyOnWriteArrayList<ExecutionEdge>();
ExecutionGate(final GateID gateID, final ExecutionVertex vertex, final ExecutionGroupEdge groupEdge,
final boolean isInputGate) {
this.gateID = gateID;
this.vertex = vertex;
this.groupEdge = groupEdge;
this.isInputGate = isInputGate;
}
public GateID getGateID() {
return this.gateID;
}
public ExecutionVertex getVertex() {
return this.vertex;
}
public boolean isInputGate() {
return this.isInputGate;
}
public int getNumberOfEdges() {
return this.edges.size();
}
public ExecutionEdge getEdge(final int index) {
return this.edges.get(index);
}
void replaceAllEdges(final Collection<ExecutionEdge> newEdges) {
this.edges.clear();
this.edges.addAll(newEdges);
}
public ChannelType getChannelType() {
return this.groupEdge.getChannelType();
}
ExecutionGroupEdge getGroupEdge() {
return this.groupEdge;
}
}