damondouglas commented on a change in pull request #15645:
URL: https://github.com/apache/beam/pull/15645#discussion_r722513958



##########
File path: playground/backend/internal/fs_tool/fs_test.go
##########
@@ -0,0 +1,49 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fs_tool
+
+import (
+       pb "beam.apache.org/playground/backend/internal/api"

Review comment:
       @pabloem FYI I don't think this is a blocker but the code for 
playground/backend/internal/api is not part of this PR.  It's a simple enough 
test that I'm ok moving forward and trusting everything will come together in 
time.

##########
File path: playground/backend/internal/fs_tool/fs.go
##########
@@ -0,0 +1,57 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fs_tool
+
+import (
+       pb "beam.apache.org/playground/backend/internal/api"
+       "fmt"
+       "github.com/google/uuid"
+)
+
+// FileSystemService interface for all type(Java/Go/Python/Scio) of FileSystem 
services.
+type FileSystemService interface {

Review comment:
       May we consider breaking up this interface to follow more of the typical 
interface to method 1:1 carnality we see with go?  Brainstorming out loud, what 
do we think about the following?  The following isn't complete but just a 
conversation starter.  I removed the `bool` from the return signatures as it 
could be part of the error.
   
   ```
   import "io/fs"
   
   type Setup interface {
       Create() (fs.FS, error)
   }
   
   type Teardown interface {
       Delete() error
   }
   
   type LifeCycle struct {
       sdk pb.Sdk
       root fs.FS
       folderGlobs []string
   }
   
   func New(ctx context.Context, sdk pb.Sdk) (*LifeCycle, error) {
           switch sdk {
        case pb.Sdk_SDK_JAVA:
                return &LifeCycle{
                        sdk: sdk,
                        root: javaFS, // See java_fs.go
                        folderGlobs: javaGlobs,
                   }, nil
        default:
                return nil, fmt.Errorf("%s isn't supported now", sdk)
        }
   }
   
   func (lc *LifeCycle) Create() (fs.FS, error) {
       for _, k := range lc.folderGlobs {
           if err := MkdirAll( ... ); err != nil {
                ...
           }
       }
   }
   
   func (lc *LifeCycle) Delete() error {
       ....
   }
   ```

##########
File path: playground/backend/internal/fs_tool/java_fs.go
##########
@@ -0,0 +1,140 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fs_tool
+
+import (
+       "fmt"
+       "github.com/google/uuid"
+       "io/fs"
+       "io/ioutil"
+       "os"
+       "path/filepath"
+)
+
+const (
+       parentBaseFileFolder   = "internal"
+       javaBaseFileFolder     = parentBaseFileFolder + "/executable_files"
+       javaSrcFileFolder      = javaBaseFileFolder + "/src"
+       javaBinFileFolder      = javaBaseFileFolder + "/bin"
+       javaExecutableFileType = "java"
+       javaCompiledFileType   = "class"
+)
+

Review comment:
       In addition to comments on the interface in 
playground/backend/internal/fs_tool/fs.go:
   
   ```
   var (
   
     javaGlobs = []string{
          parentBaseFileFolder,
          javaBaseFileFolder,
          javaSrcFileFolder,
          javaBinFileFolder,
     }
   
      javaFs = os.DirFS(parentBaseFileFolder)
   )
   
   ```
   
           

##########
File path: playground/backend/internal/fs_tool/java_fs.go
##########
@@ -0,0 +1,140 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fs_tool
+
+import (
+       "fmt"
+       "github.com/google/uuid"
+       "io/fs"
+       "io/ioutil"
+       "os"
+       "path/filepath"
+)
+
+const (
+       parentBaseFileFolder   = "internal"
+       javaBaseFileFolder     = parentBaseFileFolder + "/executable_files"
+       javaSrcFileFolder      = javaBaseFileFolder + "/src"
+       javaBinFileFolder      = javaBaseFileFolder + "/bin"
+       javaExecutableFileType = "java"
+       javaCompiledFileType   = "class"
+)
+
+type JavaFileSystemService struct{}

Review comment:
       The comments above may remove the need for a specific 
JavaFileSystemService struct.




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