Introduce StateInternalsFactory This class vends a StateInternals for a particular key. Various DoFns that access StateInternals via ProcessContext will be ported to instead accept a StateInternalsFactory.
The StateInternalsFatory must be provided by the runner to enable provisioning of the appropriate run-time StateInternals. Project: http://git-wip-us.apache.org/repos/asf/incubator-beam/repo Commit: http://git-wip-us.apache.org/repos/asf/incubator-beam/commit/d2594e0f Tree: http://git-wip-us.apache.org/repos/asf/incubator-beam/tree/d2594e0f Diff: http://git-wip-us.apache.org/repos/asf/incubator-beam/diff/d2594e0f Branch: refs/heads/master Commit: d2594e0fc588849dba905e168523deacd4f1f4dd Parents: 20244ba Author: Kenneth Knowles <[email protected]> Authored: Mon Jul 18 13:56:22 2016 -0700 Committer: Kenneth Knowles <[email protected]> Committed: Mon Jul 25 09:30:32 2016 -0700 ---------------------------------------------------------------------- .../sdk/util/state/StateInternalsFactory.java | 36 ++++++++++++++++++++ 1 file changed, 36 insertions(+) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/d2594e0f/sdks/java/core/src/main/java/org/apache/beam/sdk/util/state/StateInternalsFactory.java ---------------------------------------------------------------------- diff --git a/sdks/java/core/src/main/java/org/apache/beam/sdk/util/state/StateInternalsFactory.java b/sdks/java/core/src/main/java/org/apache/beam/sdk/util/state/StateInternalsFactory.java new file mode 100644 index 0000000..54355c7 --- /dev/null +++ b/sdks/java/core/src/main/java/org/apache/beam/sdk/util/state/StateInternalsFactory.java @@ -0,0 +1,36 @@ +/* + * 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.beam.sdk.util.state; + +import org.apache.beam.sdk.annotations.Experimental; +import org.apache.beam.sdk.annotations.Experimental.Kind; + +import java.io.Serializable; + +/** + * A factory for providing {@link StateInternals} for a particular key. + * + * <p>Because it will generally be embedded in a {@link DoFn}, albeit at execution time, + * it is marked {@link Serializable}. + */ +@Experimental(Kind.STATE) +public interface StateInternalsFactory<K> { + + /** Returns {@link StateInternals} for the provided key. */ + StateInternals<K> stateInternalsForKey(K key); +}
