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[FLINK-2283] [streaming] Proper serialization of state in StreamGroup…
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...-streaming-core/src/main/java/org/apache/flink/streaming/api/state/KVMapCheckpointer.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,82 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.streaming.api.state; | ||
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| import org.apache.flink.api.common.state.StateCheckpointer; | ||
| import org.apache.flink.api.common.typeutils.TypeSerializer; | ||
| import org.apache.flink.api.java.typeutils.runtime.ByteArrayInputView; | ||
| import org.apache.flink.core.memory.DataOutputView; | ||
| import org.apache.flink.core.memory.OutputViewDataOutputStreamWrapper; | ||
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| import java.io.ByteArrayOutputStream; | ||
| import java.io.DataOutputStream; | ||
| import java.io.IOException; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
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| /** | ||
| * Implementation of the {@link StateCheckpointer} interface for a map storing | ||
| * types compatible with Flink's serialization system. | ||
| * | ||
| * @param <K> key type | ||
| * @param <V> value type | ||
| */ | ||
| public class KVMapCheckpointer<K, V> implements StateCheckpointer<HashMap<K, V>, byte[]> { | ||
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| private TypeSerializer<K> keySerializer; | ||
| private TypeSerializer<V> valueSerializer; | ||
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| public KVMapCheckpointer(TypeSerializer<K> keySerializer, TypeSerializer<V> valueSerializer) { | ||
| this.keySerializer = keySerializer; | ||
| this.valueSerializer = valueSerializer; | ||
| } | ||
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| @Override | ||
| public byte[] snapshotState(HashMap<K, V> stateMap, long checkpointId, long checkpointTimestamp) { | ||
| ByteArrayOutputStream bos = new ByteArrayOutputStream(stateMap.size() * 16); | ||
| DataOutputView out = new OutputViewDataOutputStreamWrapper(new DataOutputStream(bos)); | ||
| try { | ||
| out.writeInt(stateMap.size()); | ||
| for (Map.Entry<K, V> kv : stateMap.entrySet()) { | ||
| keySerializer.serialize(kv.getKey(), out); | ||
| valueSerializer.serialize(kv.getValue(), out); | ||
| } | ||
| } catch (IOException e) { | ||
| throw new RuntimeException("Failed to write snapshot", e); | ||
| } | ||
| return bos.toByteArray(); | ||
| } | ||
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| @Override | ||
| public HashMap<K, V> restoreState(byte[] stateSnapshot) { | ||
| ByteArrayInputView in = new ByteArrayInputView(stateSnapshot); | ||
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| HashMap<K, V> returnMap = new HashMap<>(); | ||
| try { | ||
| int size = in.readInt(); | ||
| for (int i = 0; i < size; i++) { | ||
| returnMap.put(keySerializer.deserialize(in), valueSerializer.deserialize(in)); | ||
| } | ||
| } catch (IOException e) { | ||
| throw new RuntimeException("Failed to read snapshot", e); | ||
| } | ||
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| return returnMap; | ||
| } | ||
| } |
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