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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/*
* Copyright 2015 The Netty Project
*
* The Netty Project 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:
*
* https://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.netty.channel.epoll;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.RecvByteBufAllocator.DelegatingHandle;
import io.netty.channel.RecvByteBufAllocator.ExtendedHandle;
import io.netty.channel.unix.PreferredDirectByteBufAllocator;
import io.netty.util.UncheckedBooleanSupplier;
class EpollRecvByteAllocatorHandle extends DelegatingHandle implements ExtendedHandle {
private final PreferredDirectByteBufAllocator preferredDirectByteBufAllocator =
new PreferredDirectByteBufAllocator();
private final UncheckedBooleanSupplier defaultMaybeMoreDataSupplier = new UncheckedBooleanSupplier() {
@Override
public boolean get() {
return maybeMoreDataToRead();
}
};
private boolean isEdgeTriggered;
private boolean receivedRdHup;
EpollRecvByteAllocatorHandle(ExtendedHandle handle) {
super(handle);
}
final void receivedRdHup() {
receivedRdHup = true;
}
final boolean isReceivedRdHup() {
return receivedRdHup;
}
boolean maybeMoreDataToRead() {
/**
* EPOLL ET requires that we read until we get an EAGAIN
* (see Q9 in epoll man). However in order to
* respect auto read we supporting reading to stop if auto read is off. It is expected that the
* {@link #EpollSocketChannel} implementations will track if we are in edgeTriggered mode and all data was not
* read, and will force a EPOLLIN ready event.
*
* It is assumed RDHUP is handled externally by checking {@link #isReceivedRdHup()}.
*/
return (isEdgeTriggered && lastBytesRead() > 0) ||
(!isEdgeTriggered && lastBytesRead() == attemptedBytesRead());
}
final void edgeTriggered(boolean edgeTriggered) {
isEdgeTriggered = edgeTriggered;
}
final boolean isEdgeTriggered() {
return isEdgeTriggered;
}
@Override
public final ByteBuf allocate(ByteBufAllocator alloc) {
// We need to ensure we always allocate a direct ByteBuf as we can only use a direct buffer to read via JNI.
preferredDirectByteBufAllocator.updateAllocator(alloc);
return delegate().allocate(preferredDirectByteBufAllocator);
}
@Override
public final boolean continueReading(UncheckedBooleanSupplier maybeMoreDataSupplier) {
return ((ExtendedHandle) delegate()).continueReading(maybeMoreDataSupplier);
}
@Override
public final boolean continueReading() {
// We must override the supplier which determines if there maybe more data to read.
return continueReading(defaultMaybeMoreDataSupplier);
}
}
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