/*
* Copyright (C) 2015 SoftIndex LLC.
*
* 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 io.datakernel.datagraph.node;
import com.google.common.base.MoreObjects;
import io.datakernel.datagraph.graph.StreamId;
import io.datakernel.datagraph.graph.TaskContext;
import io.datakernel.stream.processor.StreamUnion;
import java.util.Collection;
import java.util.List;
import static java.util.Collections.singletonList;
public final class NodeUnion<T> implements Node {
private final List<StreamId> inputs;
private final StreamId output = new StreamId();
public NodeUnion(List<StreamId> inputs) {
this.inputs = inputs;
}
@Override
public Collection<StreamId> getOutputs() {
return singletonList(output);
}
public StreamId getOutput() {
return output;
}
@Override
public void createAndBind(TaskContext taskContext) {
StreamUnion<T> streamUnion = StreamUnion.create(taskContext.getEventloop());
for (StreamId input : inputs) {
taskContext.bindChannel(input, streamUnion.newInput());
}
taskContext.export(output, streamUnion.getOutput());
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this)
.add("inputs", inputs)
.add("output", output)
.toString();
}
}