Github user gyfora commented on a diff in the pull request:
https://github.com/apache/flink/pull/747#discussion_r32916334
--- Diff:
flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/state/PartitionedStreamOperatorState.java
---
@@ -0,0 +1,134 @@
+/*
+ * 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.state;
+
+import java.io.Serializable;
+import java.util.Map;
+
+import org.apache.flink.api.common.state.OperatorState;
+import org.apache.flink.api.common.state.StateCheckpointer;
+import org.apache.flink.api.java.functions.KeySelector;
+import org.apache.flink.runtime.state.PartitionedStateStore;
+import org.apache.flink.runtime.state.StateHandle;
+import org.apache.flink.runtime.state.StateHandleProvider;
+import org.apache.flink.streaming.api.operators.OneInputStreamOperator;
+
+/**
+ * Implementation of the {@link OperatorState} interface for partitioned
user
+ * states. It provides methods for checkpointing and restoring partitioned
+ * operator states upon failure.
+ *
+ * @param <IN>
+ * Input type of the underlying {@link OneInputStreamOperator}
+ * @param <S>
+ * Type of the underlying {@link OperatorState}.
+ * @param <C>
+ * Type of the state snapshot.
+ */
+public class PartitionedStreamOperatorState<IN, S, C extends Serializable>
extends
+ StreamOperatorState<S, C> {
+
+ // KeySelector for getting the state partition key for each input
+ private final KeySelector<IN, Serializable> keySelector;
+
+ private final PartitionedStateStore<S, C> stateStore;
+
+ private S defaultState;
+
+ // The currently processed input, used to extract the appropriate key
+ private IN currentInput;
+
+ public PartitionedStreamOperatorState(StateCheckpointer<S, C>
checkpointer,
+ StateHandleProvider<C> provider, KeySelector<IN,
Serializable> keySelector) {
+ super(checkpointer, provider);
+ this.keySelector = keySelector;
+ this.stateStore = new EagerStateStore<S, C>(checkpointer,
provider);
+ }
+
+ @SuppressWarnings("unchecked")
+ public PartitionedStreamOperatorState(StateHandleProvider<C> provider,
+ KeySelector<IN, Serializable> keySelector) {
+ this((StateCheckpointer<S, C>) new BasicCheckpointer(),
provider, keySelector);
+ }
+
+ @Override
+ public S getState() {
+ if (currentInput == null) {
+ return null;
+ } else {
+ try {
+ Serializable key =
keySelector.getKey(currentInput);
+ if(stateStore.containsKey(key)){
+ return stateStore.getStateForKey(key);
+ }else{
+ return defaultState;
+ }
+ } catch (Exception e) {
+ throw new RuntimeException(e);
+ }
+ }
+ }
+
+ @Override
+ public void updateState(S state) {
+ if (state == null) {
+ throw new RuntimeException("Cannot set state to null.");
+ }
+ if (currentInput == null) {
+ throw new RuntimeException("Need a valid input for
updating a state.");
+ } else {
+ try {
+
stateStore.setStateForKey(keySelector.getKey(currentInput), state);
+ } catch (Exception e) {
+ throw new RuntimeException(e);
--- End diff --
because otherwise I would need to make the updateState() method throw
Exception which I dont want
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