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AppMaker.java
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AppMaker.java
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package org.apache.s4.appbuilder;
import java.util.Collection;
import java.util.Map;
import org.apache.s4.base.Event;
import org.apache.s4.core.App;
import org.apache.s4.core.ProcessingElement;
import com.google.common.collect.LinkedListMultimap;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
abstract public class AppMaker {
/**
* NOTES: reflection+guice:
* <code>http://groups.google.com/group/google-guice/browse_thread/thread/23f4bf986a999e00/73f83a98c288a3e1?lnk=gst&q=binding+api#73f83a98c288a3e1</code>
*/
/**
* The app graph is stored as follows:
* <p>
* PE to Stream
* <p>
* PE[1]: S[1,1], S[1,2], ...
* <p>
* PE[2]: S[2,1], S[2,2], ...
* <p>
* Stream to PE
* <p>
* S[1]: PE[1]
* <p>
* S[2] : PE[2]
*
*/
private Multimap<PEMaker, StreamMaker> psGraph = LinkedListMultimap.create();
private Map<StreamMaker, PEMaker> spGraph = Maps.newHashMap();
public AppMaker() {
}
abstract protected void define();
void add(PEMaker pem, StreamMaker stream) {
psGraph.put(pem, stream);
}
void add(StreamMaker stream, PEMaker pem) {
spGraph.put(stream, pem);
}
public PEMaker addPE(Class<? extends ProcessingElement> type) {
return new PEMaker(this, type);
}
/**
* Add a stream.
*
* @param eventType
* the type of events emitted by this PE.
*
* @return a stream maker.
*/
public StreamMaker addStream(Class<? extends Event> type) {
return new StreamMaker(this, type);
}
public App make() {
return null;
}
public String toString() {
StringBuilder sb = new StringBuilder();
Map<PEMaker, Collection<StreamMaker>> psMap = psGraph.asMap();
for (Map.Entry<PEMaker, Collection<StreamMaker>> entry : psMap.entrySet()) {
sb.append(entry.getKey() + ": ");
for (StreamMaker sm : entry.getValue()) {
sb.append(sm + " ");
}
sb.append("\n");
}
for (Map.Entry<StreamMaker, PEMaker> entry : spGraph.entrySet()) {
sb.append(entry.getKey() + ": " + entry.getValue());
sb.append("\n");
}
return sb.toString();
}
}