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85 lines
2.5 KiB
ReStructuredText
85 lines
2.5 KiB
ReStructuredText
This directory contains the java worker, with the following components.
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- java/api: Ray API definition
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- java/common: utilities
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- java/runtime-common: common implementation of the runtime in worker
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- java/runtime-dev: a pure-java mock implementation of the runtime for
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fast development
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- java/runtime-native: a native implementation of the runtime
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- java/test: various tests
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- src/local\_scheduler/lib/java: JNI client library for local scheduler
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- src/plasma/lib/java: JNI client library for plasma storage
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Quick start
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===========
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Starting Ray
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------------
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.. code:: java
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Ray.init();
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Read and write remote objects
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-----------------------------
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Each remote object is considered a ``RayObject<T>`` where ``T`` is the
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type for this object. You can use ``Ray.put`` and ``RayObject<T>.get``
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to write and read the objects.
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.. code:: java
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Integer x = 1;
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RayObject<Integer> obj = Ray.put(x);
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Integer x1 = obj.get();
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assert (x.equals(x1));
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Remote functions
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----------------
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Here is an ordinary java code piece for composing
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``hello world example``.
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.. code:: java
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public class ExampleClass {
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public static void main(String[] args) {
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String str1 = add("hello", "world");
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String str = add(str1, "example");
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System.out.println(str);
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}
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public static String add(String a, String b) {
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return a + " " + b;
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}
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}
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We use ``@RayRemote`` to indicate that a function is remote, and use
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``Ray.call`` to invoke it. The result from the latter is a
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``RayObject<R>`` where ``R`` is the return type of the target function.
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The following shows the changed example with ``add`` annotated, and
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correspondent calls executed on remote machines.
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.. code:: java
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public class ExampleClass {
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public static void main(String[] args) {
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Ray.init();
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RayObject<String> objStr1 = Ray.call(ExampleClass::add, "hello", "world");
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RayObject<String> objStr2 = Ray.call(ExampleClass::add, objStr1, "example");
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String str = objStr2.get();
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System.out.println(str);
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}
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@RayRemote
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public static String add(String a, String b) {
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return a + " " + b;
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}
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}
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More information
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================
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- `Installation <https://github.com/ray-project/ray/tree/master/java/doc/installation.rst>`_
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- `API document <https://github.com/ray-project/ray/tree/master/java/doc/api.rst>`_
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- `Tutorial <https://github.com/ray-project/ray/tree/master/java/tutorial>`_
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