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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;
import static io.netty.util.internal.ObjectUtil.checkPositive;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.util.UncheckedBooleanSupplier;
/**
* Default implementation of {@link MaxMessagesRecvByteBufAllocator} which respects {@link ChannelConfig#isAutoRead()}
* and also prevents overflow.
*/
public abstract class DefaultMaxMessagesRecvByteBufAllocator implements MaxMessagesRecvByteBufAllocator {
private final boolean ignoreBytesRead;
private volatile int maxMessagesPerRead;
private volatile boolean respectMaybeMoreData = true;
public DefaultMaxMessagesRecvByteBufAllocator() {
this(1);
}
public DefaultMaxMessagesRecvByteBufAllocator(int maxMessagesPerRead) {
this(maxMessagesPerRead, false);
}
DefaultMaxMessagesRecvByteBufAllocator(int maxMessagesPerRead, boolean ignoreBytesRead) {
this.ignoreBytesRead = ignoreBytesRead;
maxMessagesPerRead(maxMessagesPerRead);
}
@Override
public int maxMessagesPerRead() {
return maxMessagesPerRead;
}
@Override
public MaxMessagesRecvByteBufAllocator maxMessagesPerRead(int maxMessagesPerRead) {
checkPositive(maxMessagesPerRead, "maxMessagesPerRead");
this.maxMessagesPerRead = maxMessagesPerRead;
return this;
}
/**
* Determine if future instances of {@link #newHandle()} will stop reading if we think there is no more data.
* @param respectMaybeMoreData
*
* - {@code true} to stop reading if we think there is no more data. This may save a system call to read from
* the socket, but if data has arrived in a racy fashion we may give up our {@link #maxMessagesPerRead()}
* quantum and have to wait for the selector to notify us of more data.
* - {@code false} to keep reading (up to {@link #maxMessagesPerRead()}) or until there is no data when we
* attempt to read.
*
* @return {@code this}.
*/
public DefaultMaxMessagesRecvByteBufAllocator respectMaybeMoreData(boolean respectMaybeMoreData) {
this.respectMaybeMoreData = respectMaybeMoreData;
return this;
}
/**
* Get if future instances of {@link #newHandle()} will stop reading if we think there is no more data.
* @return
*
* - {@code true} to stop reading if we think there is no more data. This may save a system call to read from
* the socket, but if data has arrived in a racy fashion we may give up our {@link #maxMessagesPerRead()}
* quantum and have to wait for the selector to notify us of more data.
* - {@code false} to keep reading (up to {@link #maxMessagesPerRead()}) or until there is no data when we
* attempt to read.
*
*/
public final boolean respectMaybeMoreData() {
return respectMaybeMoreData;
}
/**
* Focuses on enforcing the maximum messages per read condition for {@link #continueReading()}.
*/
public abstract class MaxMessageHandle implements ExtendedHandle {
private ChannelConfig config;
private int maxMessagePerRead;
private int totalMessages;
private int totalBytesRead;
private int attemptedBytesRead;
private int lastBytesRead;
private final boolean respectMaybeMoreData = DefaultMaxMessagesRecvByteBufAllocator.this.respectMaybeMoreData;
private final UncheckedBooleanSupplier defaultMaybeMoreSupplier = new UncheckedBooleanSupplier() {
@Override
public boolean get() {
return attemptedBytesRead == lastBytesRead;
}
};
/**
* Only {@link ChannelConfig#getMaxMessagesPerRead()} is used.
*/
@Override
public void reset(ChannelConfig config) {
this.config = config;
maxMessagePerRead = maxMessagesPerRead();
totalMessages = totalBytesRead = 0;
}
@Override
public ByteBuf allocate(ByteBufAllocator alloc) {
return alloc.ioBuffer(guess());
}
@Override
public final void incMessagesRead(int amt) {
totalMessages += amt;
}
@Override
public void lastBytesRead(int bytes) {
lastBytesRead = bytes;
if (bytes > 0) {
totalBytesRead += bytes;
}
}
@Override
public final int lastBytesRead() {
return lastBytesRead;
}
@Override
public boolean continueReading() {
return continueReading(defaultMaybeMoreSupplier);
}
@Override
public boolean continueReading(UncheckedBooleanSupplier maybeMoreDataSupplier) {
return config.isAutoRead() &&
(!respectMaybeMoreData || maybeMoreDataSupplier.get()) &&
totalMessages < maxMessagePerRead && (ignoreBytesRead || totalBytesRead > 0);
}
@Override
public void readComplete() {
}
@Override
public int attemptedBytesRead() {
return attemptedBytesRead;
}
@Override
public void attemptedBytesRead(int bytes) {
attemptedBytesRead = bytes;
}
protected final int totalBytesRead() {
return totalBytesRead < 0 ? Integer.MAX_VALUE : totalBytesRead;
}
}
}
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