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address PR comments, remove unused IPv6 WindmillServiceAddress, renam…
…e StreamingEngineConnectionsState to StreamingEngineBackends
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61 changes: 61 additions & 0 deletions
61
...ava/org/apache/beam/runners/dataflow/worker/streaming/harness/GlobalDataStreamSender.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| /* | ||
| * 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.runners.dataflow.worker.streaming.harness; | ||
|
|
||
| import com.google.common.base.Suppliers; | ||
| import java.io.Closeable; | ||
| import java.util.function.Supplier; | ||
| import javax.annotation.concurrent.ThreadSafe; | ||
| import org.apache.beam.runners.dataflow.worker.windmill.WindmillEndpoints.Endpoint; | ||
| import org.apache.beam.runners.dataflow.worker.windmill.client.WindmillStream.GetDataStream; | ||
| import org.apache.beam.sdk.annotations.Internal; | ||
|
|
||
| @Internal | ||
| @ThreadSafe | ||
| final class GlobalDataStreamSender implements Closeable, Supplier<GetDataStream> { | ||
| private final Endpoint endpoint; | ||
| private final Supplier<GetDataStream> delegate; | ||
| private volatile boolean started; | ||
|
|
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| GlobalDataStreamSender(Supplier<GetDataStream> delegate, Endpoint endpoint) { | ||
| this.delegate = Suppliers.memoize(delegate::get); | ||
| this.started = false; | ||
| this.endpoint = endpoint; | ||
| } | ||
|
|
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| @Override | ||
| public GetDataStream get() { | ||
| if (!started) { | ||
| started = true; | ||
| } | ||
| return delegate.get(); | ||
| } | ||
|
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| @Override | ||
| public void close() { | ||
| if (started) { | ||
| // get() may start the stream which is expensive, don't call it if the stream was never | ||
| // started. | ||
| delegate.get().shutdown(); | ||
| } | ||
| } | ||
|
|
||
| Endpoint endpoint() { | ||
| return endpoint; | ||
| } | ||
| } |
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