
dev.miku.r2dbc.mysql.codec.lob.MultiLob Maven / Gradle / Ivy
/*
* Copyright 2018-2020 the original author or authors.
*
* 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 dev.miku.r2dbc.mysql.codec.lob;
import dev.miku.r2dbc.mysql.util.OperatorUtils;
import io.netty.buffer.ByteBuf;
import io.netty.util.ReferenceCountUtil;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Consumer;
/**
* Base class considers multiple {@link ByteBuf}s and drains/disposes {@link ByteBuf}s on cancellation.
*/
abstract class MultiLob {
private static final Consumer RELEASE = ByteBuf::release;
private final AtomicReference> buffers;
MultiLob(List buffers) {
this.buffers = new AtomicReference<>(buffers);
}
public final Flux stream() {
return Flux.defer(() -> {
List buffers = this.buffers.getAndSet(null);
if (buffers == null) {
return Flux.error(new IllegalStateException("Source has been released"));
}
return OperatorUtils.discardOnCancel(Flux.fromIterable(buffers))
.doOnDiscard(ByteBuf.class, RELEASE)
.map(this::consume);
});
}
public final Mono discard() {
return Mono.fromRunnable(() -> {
List buffers = this.buffers.getAndSet(null);
if (buffers != null) {
for (ByteBuf buf : buffers) {
ReferenceCountUtil.safeRelease(buf);
}
}
});
}
protected abstract T convert(ByteBuf buf);
private T consume(ByteBuf buf) {
try {
return convert(buf);
} finally {
buf.release();
}
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy