/*
* 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 org.apache.flink.streaming.api.graph;
import java.util.HashMap;
import java.util.Map;
import org.apache.flink.util.StringUtils;
/**
* StreamGraphHasher that works with user provided hashes. This is useful in case we want to set (alternative) hashes
* explicitly, e.g. to provide a way of manual backwards compatibility between versions when the mechanism of generating
* hashes has changed in an incompatible way.
*
*/
public class StreamGraphUserHashHasher implements StreamGraphHasher {
@Override
public Map<Integer, byte[]> traverseStreamGraphAndGenerateHashes(StreamGraph streamGraph) {
HashMap<Integer, byte[]> hashResult = new HashMap<>();
for (StreamNode streamNode : streamGraph.getStreamNodes()) {
String userHash = streamNode.getUserHash();
if (null != userHash) {
hashResult.put(streamNode.getId(), StringUtils.hexStringToByte(userHash));
}
}
return hashResult;
}
}