Add JRuby supoort by copy all binary exectuables on pure Ruby platform

.gitignore

@@ -6,3 +6,4 @@
 /pkg
 /exe/
 !/exe/thrust
+.DS_Store

exe/thrust

@@ -1,11 +1,15 @@
 #! /usr/bin/env ruby
 
-PLATFORM = [ :cpu, :os ].map { |m| Gem::Platform.local.send(m) }.join("-")
-EXECUTABLE = File.expand_path(File.join(__dir__, PLATFORM, "thrust"))
+EXECUTE_PLATFORM = if RUBY_PLATFORM == 'java'
+  %w[target_cpu target_os].map { |m| RbConfig::CONFIG[m] }.join("-").gsub('-musl','')
+else
+  [ :cpu, :os ].map { |m| Gem::Platform.local.send(m) }.join("-")
+end
+EXECUTABLE = File.expand_path(File.join(__dir__, EXECUTE_PLATFORM, "thrust"))
 
 if File.exist?(EXECUTABLE)
   exec(EXECUTABLE, *ARGV)
 else
-  STDERR.puts("ERROR: Unsupported platform: #{PLATFORM}")
+  STDERR.puts("ERROR: Unsupported platform: #{EXECUTE_PLATFORM}")
   exit 1
 end

rakelib/package.rake

@@ -21,14 +21,14 @@ namespace :build do
 end
 task :gem => "build:native"
 
+
 NATIVE_PLATFORMS.each do |platform, executable|
   BASE_GEMSPEC.dup.tap do |gemspec|
     exedir = File.join(gemspec.bindir, platform)
     exepath = File.join(exedir, "thrust")
 
     gemspec.platform = platform
     gemspec.files << exepath
-
     gem_path = Gem::PackageTask.new(gemspec).define
     desc "Build the #{platform} gem"
     task "gem:#{platform}" => [gem_path]
@@ -43,4 +43,21 @@ NATIVE_PLATFORMS.each do |platform, executable|
   end
 end
 
+gemspec = BASE_GEMSPEC.dup
+exe_paths = NATIVE_PLATFORMS.map do |native_platform, native_executable|
+  exedir = File.join(gemspec.bindir, native_platform)
+  exepath = File.join(exedir, "thrust")
+  directory exedir
+  file exepath => [ exedir ] do
+    FileUtils.cp native_executable, exepath
+    FileUtils.chmod(0755, exepath )
+  end
+  exepath
+end
+gemspec.files += exe_paths
+gemspec.platform = 'java'
+gem_path = Gem::PackageTask.new(gemspec).define
+desc "Build the java gem"
+task "gem:java" => [gem_path]
+
 CLOBBER.add("dist")

thruster.gemspec

@@ -14,8 +14,14 @@ Gem::Specification.new do |s|
     "homepage_uri" => s.homepage,
     "rubygems_mfa_required" => "true"
   }
+
 
   s.files = Dir[ "{lib}/**/*", "MIT-LICENSE", "README.md" ]
   s.bindir = "exe"
+  if RUBY_PLATFORM =~ /java/
+    s.platform = 'java'
+    s.files + ["exe/aarch64-linux/thrust", "exe/arm64-darwin/thrust", "exe/x86_64-darwin/thrust", "exe/x86_64-linux/thrust"]
+  end
+
   s.executables << "thrust"
 end