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file_server_interface.go
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/
file_server_interface.go
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// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package java
import (
"bytes"
"fmt"
"log"
"path"
"v.io/x/ref/lib/vdl/compile"
"v.io/x/ref/lib/vdl/vdlutil"
)
const serverInterfaceTmpl = header + `
// Source: {{ .Source }}
package {{ .PackagePath }};
{{ .ServerDoc }}
@io.v.v23.vdl.VServer(
serverWrapper = {{ .ServerWrapperPath }}.class
)
public interface {{ .ServiceName }}Server {{ .Extends }} {
{{ range $method := .Methods }}
{{/* If this method has multiple return arguments, generate the class. */}}
{{ if $method.IsMultipleRet }}
/**
* Multi-return value for method {@link #{{$method.Name}}}.
*/
@io.v.v23.vdl.MultiReturn
public static class {{ $method.UppercaseMethodName }}Out {
{{ range $retArg := $method.RetArgs }}
public {{ $retArg.Type }} {{ $retArg.Name }};
{{ end }}
}
{{ end }}
{{/* Generate the method signature. */}}
{{ $method.Doc }}
@javax.annotation.CheckReturnValue
com.google.common.util.concurrent.ListenableFuture<{{ $method.RetType }}> {{ $method.Name }}(io.v.v23.context.VContext context, io.v.v23.rpc.ServerCall call{{ $method.Args }});
{{ end }}
}
`
func serverInterfaceOutArg(iface *compile.Interface, method *compile.Method, env *compile.Env) string {
switch len(method.OutArgs) {
case 0:
return "java.lang.Void"
case 1:
return javaType(method.OutArgs[0].Type, true, env)
default:
return javaPath(path.Join(interfaceFullyQualifiedName(iface)+"Server", method.Name+"Out"))
}
}
func serverInterfaceStreamingArgType(method *compile.Method, env *compile.Env) string {
sendType := javaType(method.OutStream, true, env)
recvType := javaType(method.InStream, true, env)
switch {
case method.OutStream != nil && method.InStream != nil:
return fmt.Sprintf("io.v.v23.vdl.ServerStream<%s, %s>", sendType, recvType)
case method.OutStream != nil:
return fmt.Sprintf("io.v.v23.vdl.ServerSendStream<%s>", sendType)
case method.InStream != nil:
return fmt.Sprintf("io.v.v23.vdl.ServerRecvStream<%s>", recvType)
default:
panic(fmt.Errorf("Streaming method without stream sender and receiver: %v", method))
}
}
type serverInterfaceArg struct {
Type string
Name string
}
type serverInterfaceMethod struct {
Args string
Doc string
Name string
IsMultipleRet bool
RetArgs []serverInterfaceArg
RetType string
UppercaseMethodName string
}
func processServerInterfaceMethod(method *compile.Method, iface *compile.Interface, env *compile.Env) serverInterfaceMethod {
args := javaDeclarationArgStr(method.InArgs, env, true)
if isStreamingMethod(method) {
args += ", " + serverInterfaceStreamingArgType(method, env) + " stream"
}
retArgs := make([]serverInterfaceArg, len(method.OutArgs))
for i := 0; i < len(method.OutArgs); i++ {
if method.OutArgs[i].Name != "" {
retArgs[i].Name = vdlutil.FirstRuneToLower(method.OutArgs[i].Name)
} else {
retArgs[i].Name = fmt.Sprintf("ret%d", i+1)
}
retArgs[i].Type = javaType(method.OutArgs[i].Type, false, env)
}
return serverInterfaceMethod{
Args: args,
Doc: javaDoc(method.Doc, method.DocSuffix),
Name: vdlutil.FirstRuneToLower(method.Name),
IsMultipleRet: len(retArgs) > 1,
RetArgs: retArgs,
RetType: serverInterfaceOutArg(iface, method, env),
UppercaseMethodName: method.Name,
}
}
// genJavaServerInterfaceFile generates the Java interface file for the provided
// interface.
func genJavaServerInterfaceFile(iface *compile.Interface, env *compile.Env) JavaFileInfo {
methods := make([]serverInterfaceMethod, len(iface.Methods))
for i, method := range iface.Methods {
methods[i] = processServerInterfaceMethod(method, iface, env)
}
javaServiceName := vdlutil.FirstRuneToUpper(iface.Name)
data := struct {
FileDoc string
Extends string
Methods []serverInterfaceMethod
PackagePath string
ServerDoc string
ServerVDLPath string
ServiceName string
ServerWrapperPath string
Source string
}{
FileDoc: iface.File.Package.FileDoc,
Extends: javaServerExtendsStr(iface.Embeds),
Methods: methods,
PackagePath: javaPath(javaGenPkgPath(iface.File.Package.GenPath)),
ServerDoc: javaDoc(iface.Doc, iface.DocSuffix),
ServiceName: javaServiceName,
ServerVDLPath: path.Join(iface.File.Package.GenPath, iface.Name+"ServerMethods"),
ServerWrapperPath: javaPath(javaGenPkgPath(path.Join(iface.File.Package.GenPath, javaServiceName+"ServerWrapper"))),
Source: iface.File.BaseName,
}
var buf bytes.Buffer
err := parseTmpl("server interface", serverInterfaceTmpl).Execute(&buf, data)
if err != nil {
log.Fatalf("vdl: couldn't execute struct template: %v", err)
}
return JavaFileInfo{
Name: javaServiceName + "Server.java",
Data: buf.Bytes(),
}
}