org.apache.flink.runtime.state.StatePartitionStreamProvider Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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
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*/
package org.apache.flink.runtime.state;
import org.apache.flink.annotation.PublicEvolving;
import org.apache.flink.runtime.util.NonClosingInputStreamDecorator;
import org.apache.flink.util.Preconditions;
import java.io.IOException;
import java.io.InputStream;
/**
* This class provides access to input streams that contain data of one state partition of a partitionable state.
*
* TODO use bounded stream that fail fast if the limit is exceeded on corrupted reads.
*/
@PublicEvolving
public class StatePartitionStreamProvider {
/** A ready-made stream that contains data for one state partition */
private final InputStream stream;
/** Holds potential exception that happened when actually trying to create the stream */
private final IOException creationException;
public StatePartitionStreamProvider(IOException creationException) {
this.creationException = Preconditions.checkNotNull(creationException);
this.stream = null;
}
public StatePartitionStreamProvider(InputStream stream) {
this.stream = new NonClosingInputStreamDecorator(Preconditions.checkNotNull(stream));
this.creationException = null;
}
/**
* Returns a stream with the data of one state partition.
*/
public InputStream getStream() throws IOException {
if (creationException != null) {
throw new IOException(creationException);
}
return stream;
}
}