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Nick Hill 4fa7b99da2 Introduce ByteBuf.maxFastWritableBytes() method (#9086)
Motivation

ByteBuf capacity is automatically increased as needed up to maxCapacity
when writing beyond the buffer's current capacity. However there's no
way to tell in general whether such an increase will result in a
relatively costly internal buffer re-allocation.

For unpooled buffers it always does, in pooled cases it depends on the
size of the associated chunk of allocated memory, which I don't think is
currently exposed in any way.

It would sometimes be useful to know where this limit is when making
external decisions about whether to reuse or preemptively reallocate.

It would also be advantageous to take this limit into account when
auto-increasing the capacity during writes, to defer such reallocation
until really necessary.

Modifications

Introduce new AbstractByteBuf.maxFastWritableBytes() method which will
return a value >= writableBytes() and <= maxWritableBytes().

Make use of the new method in the sizing decision made by the
AbstractByteBuf.ensureWritable(...) methods.

Result

Less reallocation/copying.
2019-05-22 20:11:56 +02:00
.github Use GitHub Issue/PR Template Feature 2016-12-07 11:40:26 -08:00
.mvn support publishing snapshots from docker based ci (#8634) 2018-12-07 06:16:39 +01:00
all Always include classes from all native transports no matter on which platfrom netty-all is build (#9111) 2019-04-30 23:24:14 +02:00
bom Remove OIO transport (and transports that depend on it). (#8580) 2018-11-21 15:23:18 +01:00
buffer Introduce ByteBuf.maxFastWritableBytes() method (#9086) 2019-05-22 20:11:56 +02:00
codec Ensure "full" ownership of msgs passed to EmbeddedChannel.writeInbound() (#9058) 2019-05-22 12:35:03 +02:00
codec-dns Add support for TCP fallback when we receive a truncated DnsResponse (#9139) 2019-05-17 14:47:10 +02:00
codec-haproxy migrate java8: use requireNonNull (#8840) 2019-02-04 10:32:25 +01:00
codec-http Remove deprecated GraalVM native-image flags (#9118) 2019-05-22 19:22:03 +02:00
codec-http2 Remove deprecated GraalVM native-image flags (#9118) 2019-05-22 19:22:03 +02:00
codec-memcache codec-memcache: copy metadata in binary full request response (#9160) 2019-05-22 11:06:16 +02:00
codec-mqtt migrate java8: use requireNonNull (#8840) 2019-02-04 10:32:25 +01:00
codec-redis migrate java8: use requireNonNull (#8840) 2019-02-04 10:32:25 +01:00
codec-smtp SmtpRequestEncoderTest ByteBuf leak (#9075) 2019-04-19 08:47:28 +02:00
codec-socks migrate java8: use requireNonNull (#8840) 2019-02-04 10:32:25 +01:00
codec-stomp use checkPositive/checkPositiveOrZero (#8835) 2019-02-04 15:55:07 +01:00
codec-xml Update to new checkstyle plugin (#8777) 2019-01-24 16:24:19 +01:00
common Only use static Exception instances when we can ensure addSuppressed … (#9152) 2019-05-17 22:42:53 +02:00
dev-tools Update version number to start working on Netty 5 2018-11-20 15:49:57 +01:00
docker Remove deprecated GraalVM native-image flags (#9118) 2019-05-22 19:22:03 +02:00
example Allow to specify KeyStore type in SslContext (#9003) 2019-05-10 07:51:20 +02:00
handler Correctly detect that KeyManagerFactory is not supported when using OpenSSL 1.1.0+ (#9170) 2019-05-22 19:08:40 +02:00
handler-proxy Remove code that accounts for changing EventExecutors in DefaultPromise (#8996) 2019-04-03 10:36:55 +02:00
license Add the NOTICE of the forked portion of Apache Harmony 2018-01-30 11:22:51 +01:00
microbench Ensure "full" ownership of msgs passed to EmbeddedChannel.writeInbound() (#9058) 2019-05-22 12:35:03 +02:00
resolver migrate java8: use requireNonNull (#8840) 2019-02-04 10:32:25 +01:00
resolver-dns Only try to use reflection to access default nameservers when using Java8 and lower (#9157) 2019-05-18 08:21:59 +02:00
tarball Update version number to start working on Netty 5 2018-11-20 15:49:57 +01:00
testsuite KQueueEventLoop | EpollEventLoop may incorrectly update registration when FD is reused. 2019-05-22 10:11:42 +02:00
testsuite-autobahn Deprecate ChannelInboundHandlerAdapter and ChannelOutboundHandlerAdapter (#8929) 2019-03-13 09:46:10 +01:00
testsuite-http2 Deprecate ChannelInboundHandlerAdapter and ChannelOutboundHandlerAdapter (#8929) 2019-03-13 09:46:10 +01:00
testsuite-native-image Add SVM metadata and minimal substitutions to build graalvm native image applications. (#8963) 2019-04-29 09:12:09 +02:00
testsuite-osgi Adjust testsuite-osgi to resolve bundles from local build (#8944) 2019-03-18 09:56:08 +01:00
testsuite-shading Use maven plugin to prevent API/ABI breakage as part of build process (#8904) 2019-03-01 19:48:29 +01:00
transport Use correct object to synchronize on in DefaultChannelPipeline (#9171) 2019-05-22 18:50:28 +02:00
transport-native-epoll KQueueEventLoop | EpollEventLoop may incorrectly update registration when FD is reused. 2019-05-22 10:11:42 +02:00
transport-native-kqueue KQueueEventLoop | EpollEventLoop may incorrectly update registration when FD is reused. 2019-05-22 10:11:42 +02:00
transport-native-unix-common Only use static Exception instances when we can ensure addSuppressed … (#9152) 2019-05-17 22:42:53 +02:00
transport-native-unix-common-tests Merge ChannelInboundHandler and ChannelOutboundHandler into ChannelHa… (#8957) 2019-03-28 09:28:27 +00:00
transport-sctp Deprecate ChannelInboundHandlerAdapter and ChannelOutboundHandlerAdapter (#8929) 2019-03-13 09:46:10 +01:00
.fbprefs Updated Find Bugs configuration 2009-03-04 10:33:09 +00:00
.gitattributes Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
.gitignore Add .gitignore for docker-sync stuff 2019-03-19 14:04:21 +01:00
CONTRIBUTING.md Move the pull request guide to the developer guide 2014-03-12 13:13:58 +09:00
LICENSE.txt Relicensed to Apache License v2 2009-08-28 07:15:49 +00:00
mvnw Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
mvnw.cmd Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
NOTICE.txt Add the NOTICE of the forked portion of Apache Harmony 2018-01-30 11:22:51 +01:00
pom.xml Remove deprecated GraalVM native-image flags (#9118) 2019-05-22 19:22:03 +02:00
README.md Provide an Automatic-Module-Name for the netty-all artifact fixes #7644 2018-01-27 20:31:16 +01:00
run-example.sh Drop SPDY support (#8845) 2019-02-07 09:25:31 +01:00

Netty Project

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.

How to build

For the detailed information about building and developing Netty, please visit the developer guide. This page only gives very basic information.

You require the following to build Netty:

Note that this is build-time requirement. JDK 5 (for 3.x) or 6 (for 4.0+) is enough to run your Netty-based application.

Branches to look

Development of all versions takes place in each branch whose name is identical to <majorVersion>.<minorVersion>. For example, the development of 3.9 and 4.0 resides in the branch '3.9' and the branch '4.0' respectively.

Usage with JDK 9

Netty can be used in modular JDK9 applications as a collection of automatic modules. The module names follow the reverse-DNS style, and are derived from subproject names rather than root packages due to historical reasons. They are listed below:

  • io.netty.all
  • io.netty.buffer
  • io.netty.codec
  • io.netty.codec.dns
  • io.netty.codec.haproxy
  • io.netty.codec.http
  • io.netty.codec.http2
  • io.netty.codec.memcache
  • io.netty.codec.mqtt
  • io.netty.codec.redis
  • io.netty.codec.smtp
  • io.netty.codec.socks
  • io.netty.codec.stomp
  • io.netty.codec.xml
  • io.netty.common
  • io.netty.handler
  • io.netty.handler.proxy
  • io.netty.resolver
  • io.netty.resolver.dns
  • io.netty.transport
  • io.netty.transport.epoll (native omitted - reserved keyword in Java)
  • io.netty.transport.kqueue (native omitted - reserved keyword in Java)
  • io.netty.transport.unix.common (native omitted - reserved keyword in Java)
  • io.netty.transport.rxtx
  • io.netty.transport.sctp
  • io.netty.transport.udt

Automatic modules do not provide any means to declare dependencies, so you need to list each used module separately in your module-info file.