Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/2648#discussion_r83678698
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/ManagedInitializationContext.java
---
@@ -0,0 +1,53 @@
+/*
+ * 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.runtime.state;
+
+import org.apache.flink.api.common.state.KeyedStateStore;
+import org.apache.flink.api.common.state.OperatorStateStore;
+
+/**
+ * This interface provides a context in which operators can initialize by
registering to managed state (i.e. state that
+ * is managed by state backends).
+ * <p/>
+ *
+ * Operator state is available to all operators, while keyed state is only
available for operators after keyBy.
+ * <p/>
+ *
+ * For the purpose of initialization, the context signals if the state is
empty (new operator) or was restored from
+ * a previous execution of this operator.
+ *
+ */
+public interface ManagedInitializationContext {
--- End diff --
I think this interface and its sub interfaces/implementations should be in
the same module as `AbstractStreamOperator` and somewhere in the api package
space.
Also, the naming could be changed to something like
`StateInitializationContext` -> `FunctionInitializationContext` ->
`OperatorInitializationContext`. Or something reflecting their purpose but
`StateInitializationContext` should be at the bottom of the hierarchy.
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