/
CachedPublishers.java
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/
CachedPublishers.java
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/*
* Copyright 2020 Google LLC
*
* Licensed 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 com.google.cloud.pubsublite.spark.internal;
import com.google.api.core.ApiService;
import com.google.cloud.pubsublite.MessageMetadata;
import com.google.cloud.pubsublite.internal.Publisher;
import com.google.cloud.pubsublite.spark.PslWriteDataSourceOptions;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import javax.annotation.concurrent.GuardedBy;
/** Cached {@link Publisher}s to reuse publisher of same settings in the same task. */
public class CachedPublishers {
// TODO(jiangmichaellll): Use com.google.cloud.pubsublite.internal.wire.SystemExecutors
// once new PSL client library is released.
private final Executor listenerExecutor = Executors.newSingleThreadExecutor();
@GuardedBy("this")
private final Map<PslWriteDataSourceOptions, Publisher<MessageMetadata>> publishers =
new HashMap<>();
public synchronized Publisher<MessageMetadata> getOrCreate(
PslWriteDataSourceOptions writeOptions) {
Publisher<MessageMetadata> publisher = publishers.get(writeOptions);
if (publisher != null && publisher.state() == ApiService.State.RUNNING) {
return publisher;
}
publisher = writeOptions.createNewPublisher();
publishers.put(writeOptions, publisher);
publisher.addListener(
new ApiService.Listener() {
@Override
public void failed(ApiService.State s, Throwable t) {
removePublisher(writeOptions);
}
},
listenerExecutor);
publisher.startAsync().awaitRunning();
return publisher;
}
private synchronized void removePublisher(PslWriteDataSourceOptions writeOptions) {
publishers.remove(writeOptions);
}
}