/
ObjectThreader.java
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/
ObjectThreader.java
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/* Copyright 2019 Pascal Christoph (hbz), and others.
*
* 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 org.metafacture.flowcontrol;
import org.metafacture.framework.FluxCommand;
import org.metafacture.framework.ObjectPipe;
import org.metafacture.framework.ObjectReceiver;
import org.metafacture.framework.Tee;
import org.metafacture.framework.annotations.Description;
import org.metafacture.framework.annotations.In;
import org.metafacture.framework.annotations.Out;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
/**
* Divides incoming objects and distributes them to added receivers. These
* receivers are coupled with an
* {@link org.metafacture.flowcontrol.ObjectPipeDecoupler}, so each added
* receiver runs in its own thread.
*
* @param <T> Object type
*
* @author Pascal Christoph (dr0i)
* @author Fabian Steeg (fsteeg)
*
*/
@In(Object.class)
@Out(Object.class)
@Description("Incoming objects are distributed to the added receivers, running in their own threads.")
@FluxCommand("thread-object-tee")
public class ObjectThreader<T> implements Tee<ObjectReceiver<T>>, ObjectPipe<T, ObjectReceiver<T>> {
private static final Logger LOG = LoggerFactory.getLogger(ObjectThreader.class);
private final List<ObjectReceiver<T>> receivers = new ArrayList<ObjectReceiver<T>>();
private int objectNumber;
/**
* Creates an instance of {@link ObjectThreader}.
*/
public ObjectThreader() {
}
@Override
public void process(final T obj) {
receivers.get(objectNumber).process(obj);
if (objectNumber == receivers.size() - 1) {
objectNumber = 0;
}
else {
++objectNumber;
}
}
@Override
public Tee<ObjectReceiver<T>> addReceiver(final ObjectReceiver<T> receiver) {
LOG.info("Adding thread {}", receivers.size() + 1);
final ObjectPipeDecoupler<T> opd = new ObjectPipeDecoupler<>();
opd.setReceiver(receiver);
receivers.add(opd);
return this;
}
@Override
public <R extends ObjectReceiver<T>> R setReceiver(final R receiver) {
receivers.clear();
addReceiver(receiver);
return receiver;
}
@Override
public <R extends ObjectReceiver<T>> R setReceivers(final R receiver, final ObjectReceiver<T> lateralReceiver) {
receivers.clear();
addReceiver(receiver);
addReceiver(lateralReceiver);
return receiver;
}
@Override
public void resetStream() {
receivers.forEach(ObjectReceiver::resetStream);
}
@Override
public void closeStream() {
receivers.forEach(ObjectReceiver::closeStream);
}
@Override
public Tee<ObjectReceiver<T>> removeReceiver(final ObjectReceiver<T> receiver) {
receivers.remove(receiver);
return this;
}
@Override
public Tee<ObjectReceiver<T>> clearReceivers() {
receivers.clear();
return this;
}
}