io.helidon.security.jersey.SubscriberOutputStream Maven / Gradle / Ivy
/*
* Copyright (c) 2018 Oracle and/or its affiliates. All rights reserved.
*
* 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 io.helidon.security.jersey;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.util.function.Consumer;
import io.helidon.common.reactive.Flow;
/**
* An {@link Flow.Subscriber subscriber} that can subscribe to a source of {@code ByteBuffer} data chunks and then
* write these data chunks into an underlying {@link OutputStream output stream}.
*/
@SuppressWarnings("WeakerAccess")
class SubscriberOutputStream implements Flow.Subscriber {
private final OutputStream outputStream;
private final Consumer completionCallback;
private volatile Flow.Subscription subscription;
/**
* Create new subscriber that writes all the receive data chunks serially into a supplied output stream.
*
* @param outputStream underlying output stream to send the data to.
* @param completionCallback a callback to be invoked when the {@link #onComplete()} method is invoked and the underlying
* output stream has been closed. The callback accepts an error, that may be either {@code null}
* in case of a successful completion, or may contain information about any failure related to
* closing the underlying output stream.
*/
SubscriberOutputStream(OutputStream outputStream, Consumer completionCallback) {
this.outputStream = outputStream;
this.completionCallback = completionCallback;
}
@Override
public void onSubscribe(Flow.Subscription subscription) {
this.subscription = subscription;
subscription.request(1);
}
@Override
public void onNext(ByteBuffer dataBuffer) {
try {
if (dataBuffer.hasArray()) {
outputStream.write(
dataBuffer.array(), dataBuffer.arrayOffset() + dataBuffer.position(), dataBuffer.remaining());
} else {
byte[] data = new byte[dataBuffer.remaining()];
outputStream.write(data);
}
subscription.request(1);
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override
public void onError(Throwable throwable) {
// ignored
}
@Override
public void onComplete() {
try {
outputStream.close();
completionCallback.accept(null);
} catch (IOException e) {
completionCallback.accept(e);
}
}
}