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@@ -1,3 +1,135 @@
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+2016-05-16 version 3.0.0-beta-3 (C++/Java/Python/Ruby/Nano/Objective-C/C#/JavaScript)
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+ General
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+ * Supported Proto3 lite-runtime in C++/Java for mobile platforms.
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+ * Any type now supports APIs to specify prefixes other than
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+ type.googleapis.com
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+ * Removed javanano_use_deprecated_package option; Nano will always has its own
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+ ".nano" package.
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+
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+ C++ (Beta)
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+ * Improved hash maps.
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+ - Improved hash maps comments. In particular, please note that equal hash
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+ maps will not necessarily have the same iteration order and
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+ serialization.
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+ - Added a new hash maps implementation that will become the default in a
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+ later release.
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+ * Arenas
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+ - Several inlined methods in Arena were moved to out-of-line to improve
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+ build performance and code size.
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+ - Added SpaceAllocatedAndUsed() to report both space used and allocated
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+ - Added convenient class UnsafeArenaAllocatedRepeatedPtrFieldBackInserter
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+ * Any
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+ - Allow custom type URL prefixes in Any packing.
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+ - TextFormat now expand the Any type rather than printing bytes.
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+ * Performance optimizations and various bug fixes.
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+
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+ Java (Beta)
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+ * Introduced an ExperimentalApi annotation. Annotated APIs are experimental
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+ and are subject to change in a backward incompatible way in future releases.
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+ * Introduced zero-copy serialization as an ExperimentalApi
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+ - Introduction of the `ByteOutput` interface. This is similar to
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+ `OutputStream` but provides semantics for lazy writing (i.e. no
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+ immediate copy required) of fields that are considered to be immutable.
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+ - `ByteString` now supports writing to a `ByteOutput`, which will directly
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+ expose the internals of the `ByteString` (i.e. `byte[]` or `ByteBuffer`)
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+ to the `ByteOutput` without copying.
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+ - `CodedOutputStream` now supports writing to a `ByteOutput`. `ByteString`
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+ instances that are too large to fit in the internal buffer will be
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+ (lazily) written to the `ByteOutput` directly.
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+ - This allows applications using large `ByteString` fields to avoid
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+ duplication of these fields entirely. Such an application can supply a
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+ `ByteOutput` that chains together the chunks received from
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+ `CodedOutputStream` before forwarding them onto the IO system.
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+ * Other related changes to `CodedOutputStream`
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+ - Additional use of `sun.misc.Unsafe` where possible to perform fast
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+ access to `byte[]` and `ByteBuffer` values and avoiding unnecessary
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+ range checking.
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+ - `ByteBuffer`-backed `CodedOutputStream` now writes directly to the
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+ `ByteBuffer` rather than to an intermediate array.
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+ * Improved lite-runtime.
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+ - Lite protos now implement deep equals/hashCode/toString
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+ - Significantly improved the performance of Builder#mergeFrom() and
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+ Builder#mergeDelimitedFrom()
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+ * Various bug fixes and small feature enhancement.
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+ - Fixed stack overflow when in hashCode() for infinite recursive oneofs.
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+ - Fixed the lazy field parsing in lite to merge rather than overwrite.
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+ - TextFormat now supports reporting line/column numbers on errors.
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+ - Updated to add appropriate @Override for better compiler errors.
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+
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+ Python (Beta)
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+ * Added JSON format for Any, Struct, Value and ListValue
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+ * [ ] is now accepted for both repeated scalar fields and repeated message
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+ fields in text format parser.
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+ * Numerical field name is now supported in text format.
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+ * Added DiscardUnknownFields API for python protobuf message.
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+
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+ Objective-C (Beta)
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+ * Proto comments now come over as HeaderDoc comments in the generated sources
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+ so Xcode can pick them up and display them.
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+ * The library headers have been updated to use HeaderDoc comments so Xcode can
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+ pick them up and display them.
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+ * The per message and per field overhead in both generated code and runtime
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+ object sizes was reduced.
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+ * Generated code now include deprecated annotations when the proto file
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+ included them.
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+
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+ C# (Beta)
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+ In general: some changes are breaking, which require regenerating messages.
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+ Most user-written code will not be impacted *except* for the renaming of enum
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+ values.
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+
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+ * Allow custom type URL prefixes in `Any` packing, and ignore them when
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+ unpacking
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+ * `protoc` is now in a separate NuGet package (Google.Protobuf.Tools)
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+ * New option: `internal_access` to generate internal classes
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+ * Enum values are now PascalCased, and if there's a prefix which matches the
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+ name of the enum, that is removed (so an enum `COLOR` with a value
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+ `COLOR_BLUE` would generate a value of just `Blue`). An option
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+ (`legacy_enum_values`) is temporarily available to disable this, but the
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+ option will be removed for GA.
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+ * `json_name` option is now honored
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+ * If group tags are encountered when parsing, they are validated more
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+ thoroughly (although we don't support actual groups)
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+ * NuGet dependencies are better specified
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+ * Breaking: `Preconditions` is renamed to `ProtoPreconditions`
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+ * Breaking: `GeneratedCodeInfo` is renamed to `GeneratedClrTypeInfo`
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+ * `JsonFormatter` now allows writing to a `TextWriter`
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+ * New interface, `ICustomDiagnosticMessage` to allow more compact
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+ representations from `ToString`
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+ * `CodedInputStream` and `CodedOutputStream` now implement `IDisposable`,
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+ which simply disposes of the streams they were constructed with
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+ * Map fields no longer support null values (in line with other languages)
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+ * Improvements in JSON formatting and parsing
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+
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+ Javascript (Alpha)
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+ * Better support for "bytes" fields: bytes fields can be read as either a
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+ base64 string or UInt8Array (in environments where TypedArray is supported).
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+ * New support for CommonJS imports. This should make it easier to use the
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+ JavaScript support in Node.js and tools like WebPack. See js/README.md for
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+ more information.
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+ * Some significant internal refactoring to simplify and modularize the code.
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+
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+ Ruby (Alpha)
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+ * JSON serialization now properly uses camelCased names, with a runtime option
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+ that will preserve original names from .proto files instead.
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+ * Well-known types are now included in the distribution.
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+ * Release now includes binary gems for Windows, Mac, and Linux instead of just
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+ source gems.
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+ * Bugfix for serializing oneofs.
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+
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+ C++/Java Lite (Alpha)
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+ A new "lite" generator parameter was introduced in the protoc for C++ and
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+ Java for Proto3 syntax messages. Example usage:
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+
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+ ./protoc --cpp_out=lite:$OUTPUT_PATH foo.proto
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+
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+ The protoc will treat the current input and all the transitive dependencies
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+ as LITE. The same generator parameter must be used to generate the
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+ dependencies.
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+
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+ In Proto3 syntax files, "optimized_for=LITE_RUNTIME" is no longer supported.
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+
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+
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2015-12-30 version 3.0.0-beta-2 (C++/Java/Python/Ruby/Nano/Objective-C/C#/JavaScript)
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General
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* Introduced a new language implementation: JavaScript.
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Jisi Liu