/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* 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 backtype.storm.utils;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import backtype.storm.messaging.IConnection;
import backtype.storm.messaging.TaskMessage;
public class TransferDrainer {
private HashMap<String, ArrayList<ArrayList<TaskMessage>>> bundles = new HashMap();
public void add(HashMap<String, ArrayList<TaskMessage>> workerTupleSetMap) {
for (String key : workerTupleSetMap.keySet()) {
ArrayList<ArrayList<TaskMessage>> bundle = bundles.get(key);
if (null == bundle) {
bundle = new ArrayList<ArrayList<TaskMessage>>();
bundles.put(key, bundle);
}
ArrayList tupleSet = workerTupleSetMap.get(key);
if (null != tupleSet && tupleSet.size() > 0) {
bundle.add(tupleSet);
}
}
}
public void send(HashMap<String, IConnection> connections) {
for (String hostPort : bundles.keySet()) {
IConnection connection = connections.get(hostPort);
if (null != connection) {
ArrayList<ArrayList<TaskMessage>> bundle = bundles.get(hostPort);
Iterator<TaskMessage> iter = getBundleIterator(bundle);
if (null != iter && iter.hasNext()) {
connection.send(iter);
}
}
}
}
private Iterator<TaskMessage> getBundleIterator(final ArrayList<ArrayList<TaskMessage>> bundle) {
if (null == bundle) {
return null;
}
return new Iterator<TaskMessage> () {
private int offset = 0;
private int size = 0;
{
for (ArrayList<TaskMessage> list : bundle) {
size += list.size();
}
}
private int bundleOffset = 0;
private Iterator<TaskMessage> iter = bundle.get(bundleOffset).iterator();
@Override
public boolean hasNext() {
if (offset < size) {
return true;
}
return false;
}
@Override
public TaskMessage next() {
TaskMessage msg = null;
if (iter.hasNext()) {
msg = iter.next();
} else {
bundleOffset++;
iter = bundle.get(bundleOffset).iterator();
msg = iter.next();
}
if (null != msg) {
offset++;
}
return msg;
}
@Override
public void remove() {
throw new RuntimeException("not supported");
}
};
}
public void clear() {
bundles.clear();
}
}