io.netty.channel.nio.AbstractNioByteChannel Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including
all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and
Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* Copyright 2012 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:
*
* 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.netty.channel.nio;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.Channel;
import io.netty.channel.ChannelConfig;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelOutboundBuffer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.FileRegion;
import io.netty.channel.RecvByteBufAllocator;
import io.netty.channel.socket.ChannelInputShutdownEvent;
import io.netty.util.internal.StringUtil;
import java.io.IOException;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
/**
* {@link AbstractNioChannel} base class for {@link Channel}s that operate on bytes.
*/
public abstract class AbstractNioByteChannel extends AbstractNioChannel {
private static final String EXPECTED_TYPES =
" (expected: " + StringUtil.simpleClassName(ByteBuf.class) + ", " +
StringUtil.simpleClassName(FileRegion.class) + ')';
private Runnable flushTask;
/**
* Create a new instance
*
* @param parent the parent {@link Channel} by which this instance was created. May be {@code null}
* @param ch the underlying {@link SelectableChannel} on which it operates
*/
protected AbstractNioByteChannel(Channel parent, SelectableChannel ch) {
super(parent, ch, SelectionKey.OP_READ);
}
@Override
protected AbstractNioUnsafe newUnsafe() {
return new NioByteUnsafe();
}
protected class NioByteUnsafe extends AbstractNioUnsafe {
private RecvByteBufAllocator.Handle allocHandle;
private void closeOnRead(ChannelPipeline pipeline) {
SelectionKey key = selectionKey();
setInputShutdown();
if (isOpen()) {
if (Boolean.TRUE.equals(config().getOption(ChannelOption.ALLOW_HALF_CLOSURE))) {
key.interestOps(key.interestOps() & ~readInterestOp);
pipeline.fireUserEventTriggered(ChannelInputShutdownEvent.INSTANCE);
} else {
close(voidPromise());
}
}
}
private void handleReadException(ChannelPipeline pipeline,
ByteBuf byteBuf, Throwable cause, boolean close) {
if (byteBuf != null) {
if (byteBuf.isReadable()) {
setReadPending(false);
pipeline.fireChannelRead(byteBuf);
} else {
byteBuf.release();
}
}
pipeline.fireChannelReadComplete();
pipeline.fireExceptionCaught(cause);
if (close || cause instanceof IOException) {
closeOnRead(pipeline);
}
}
@Override
public final void read() {
final ChannelConfig config = config();
if (!config.isAutoRead() && !isReadPending()) {
// ChannelConfig.setAutoRead(false) was called in the meantime
removeReadOp();
return;
}
final ChannelPipeline pipeline = pipeline();
final ByteBufAllocator allocator = config.getAllocator();
final int maxMessagesPerRead = config.getMaxMessagesPerRead();
RecvByteBufAllocator.Handle allocHandle = this.allocHandle;
if (allocHandle == null) {
this.allocHandle = allocHandle = config.getRecvByteBufAllocator().newHandle();
}
ByteBuf byteBuf = null;
int messages = 0;
boolean close = false;
try {
int totalReadAmount = 0;
boolean readPendingReset = false;
do {
byteBuf = allocHandle.allocate(allocator);
int writable = byteBuf.writableBytes();
int localReadAmount = doReadBytes(byteBuf);
if (localReadAmount <= 0) {
// not was read release the buffer
byteBuf.release();
byteBuf = null;
close = localReadAmount < 0;
break;
}
if (!readPendingReset) {
readPendingReset = true;
setReadPending(false);
}
pipeline.fireChannelRead(byteBuf);
byteBuf = null;
if (totalReadAmount >= Integer.MAX_VALUE - localReadAmount) {
// Avoid overflow.
totalReadAmount = Integer.MAX_VALUE;
break;
}
totalReadAmount += localReadAmount;
// stop reading
if (!config.isAutoRead()) {
break;
}
if (localReadAmount < writable) {
// Read less than what the buffer can hold,
// which might mean we drained the recv buffer completely.
break;
}
} while (++ messages < maxMessagesPerRead);
pipeline.fireChannelReadComplete();
allocHandle.record(totalReadAmount);
if (close) {
closeOnRead(pipeline);
close = false;
}
} catch (Throwable t) {
handleReadException(pipeline, byteBuf, t, close);
} finally {
// Check if there is a readPending which was not processed yet.
// This could be for two reasons:
// * The user called Channel.read() or ChannelHandlerContext.read() in channelRead(...) method
// * The user called Channel.read() or ChannelHandlerContext.read() in channelReadComplete(...) method
//
// See https://github.com/netty/netty/issues/2254
if (!config.isAutoRead() && !isReadPending()) {
removeReadOp();
}
}
}
}
@Override
protected void doWrite(ChannelOutboundBuffer in) throws Exception {
int writeSpinCount = -1;
boolean setOpWrite = false;
for (;;) {
Object msg = in.current();
if (msg == null) {
// Wrote all messages.
clearOpWrite();
// Directly return here so incompleteWrite(...) is not called.
return;
}
if (msg instanceof ByteBuf) {
ByteBuf buf = (ByteBuf) msg;
int readableBytes = buf.readableBytes();
if (readableBytes == 0) {
in.remove();
continue;
}
boolean done = false;
long flushedAmount = 0;
if (writeSpinCount == -1) {
writeSpinCount = config().getWriteSpinCount();
}
for (int i = writeSpinCount - 1; i >= 0; i --) {
int localFlushedAmount = doWriteBytes(buf);
if (localFlushedAmount == 0) {
setOpWrite = true;
break;
}
flushedAmount += localFlushedAmount;
if (!buf.isReadable()) {
done = true;
break;
}
}
in.progress(flushedAmount);
if (done) {
in.remove();
} else {
// Break the loop and so incompleteWrite(...) is called.
break;
}
} else if (msg instanceof FileRegion) {
FileRegion region = (FileRegion) msg;
boolean done = region.transfered() >= region.count();
if (!done) {
long flushedAmount = 0;
if (writeSpinCount == -1) {
writeSpinCount = config().getWriteSpinCount();
}
for (int i = writeSpinCount - 1; i >= 0; i--) {
long localFlushedAmount = doWriteFileRegion(region);
if (localFlushedAmount == 0) {
setOpWrite = true;
break;
}
flushedAmount += localFlushedAmount;
if (region.transfered() >= region.count()) {
done = true;
break;
}
}
in.progress(flushedAmount);
}
if (done) {
in.remove();
} else {
// Break the loop and so incompleteWrite(...) is called.
break;
}
} else {
// Should not reach here.
throw new Error();
}
}
incompleteWrite(setOpWrite);
}
@Override
protected final Object filterOutboundMessage(Object msg) {
if (msg instanceof ByteBuf) {
ByteBuf buf = (ByteBuf) msg;
if (buf.isDirect()) {
return msg;
}
return newDirectBuffer(buf);
}
if (msg instanceof FileRegion) {
return msg;
}
throw new UnsupportedOperationException(
"unsupported message type: " + StringUtil.simpleClassName(msg) + EXPECTED_TYPES);
}
protected final void incompleteWrite(boolean setOpWrite) {
// Did not write completely.
if (setOpWrite) {
setOpWrite();
} else {
// Schedule flush again later so other tasks can be picked up in the meantime
Runnable flushTask = this.flushTask;
if (flushTask == null) {
flushTask = this.flushTask = new Runnable() {
@Override
public void run() {
flush();
}
};
}
eventLoop().execute(flushTask);
}
}
/**
* Write a {@link FileRegion}
*
* @param region the {@link FileRegion} from which the bytes should be written
* @return amount the amount of written bytes
*/
protected abstract long doWriteFileRegion(FileRegion region) throws Exception;
/**
* Read bytes into the given {@link ByteBuf} and return the amount.
*/
protected abstract int doReadBytes(ByteBuf buf) throws Exception;
/**
* Write bytes form the given {@link ByteBuf} to the underlying {@link java.nio.channels.Channel}.
* @param buf the {@link ByteBuf} from which the bytes should be written
* @return amount the amount of written bytes
*/
protected abstract int doWriteBytes(ByteBuf buf) throws Exception;
protected final void setOpWrite() {
final SelectionKey key = selectionKey();
// Check first if the key is still valid as it may be canceled as part of the deregistration
// from the EventLoop
// See https://github.com/netty/netty/issues/2104
if (!key.isValid()) {
return;
}
final int interestOps = key.interestOps();
if ((interestOps & SelectionKey.OP_WRITE) == 0) {
key.interestOps(interestOps | SelectionKey.OP_WRITE);
}
}
protected final void clearOpWrite() {
final SelectionKey key = selectionKey();
// Check first if the key is still valid as it may be canceled as part of the deregistration
// from the EventLoop
// See https://github.com/netty/netty/issues/2104
if (!key.isValid()) {
return;
}
final int interestOps = key.interestOps();
if ((interestOps & SelectionKey.OP_WRITE) != 0) {
key.interestOps(interestOps & ~SelectionKey.OP_WRITE);
}
}
}
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