[GitHub] [carbondata] jackylk commented on a change in pull request #2465: [CARBONDATA-2863] Refactored CarbonFile interface

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jackylk commented on a change in pull request #2465: [CARBONDATA-2863] 
Refactored CarbonFile interface
URL: https://github.com/apache/carbondata/pull/2465#discussion_r349920438
 
 

 ##########
 File path: 
core/src/main/java/org/apache/carbondata/core/datastore/filesystem/AbstractDFSCarbonFile.java
 ##########
 @@ -58,85 +59,82 @@
    */
   private static final Logger LOGGER =
       LogServiceFactory.getLogService(AbstractDFSCarbonFile.class.getName());
-  protected FileStatus fileStatus;
-  public FileSystem fs;
+  protected FileSystem fileSystem;
   protected Configuration hadoopConf;
+  protected Path path;
 
-  public AbstractDFSCarbonFile(String filePath) {
+  AbstractDFSCarbonFile(String filePath) {
     this(filePath, FileFactory.getConfiguration());
   }
 
-  public AbstractDFSCarbonFile(String filePath, Configuration hadoopConf) {
-    this.hadoopConf = hadoopConf;
-    filePath = filePath.replace("\\", "/");
-    Path path = new Path(filePath);
-    try {
-      fs = path.getFileSystem(this.hadoopConf);
-      fileStatus = fs.getFileStatus(path);
-    } catch (IOException e) {
-      LOGGER.debug("Exception occurred:" + e.getMessage(), e);
-    }
+  AbstractDFSCarbonFile(String filePath, Configuration hadoopConf) {
+    this(new Path(filePath), hadoopConf);
   }
 
-  public AbstractDFSCarbonFile(Path path) {
+  AbstractDFSCarbonFile(Path path) {
     this(path, FileFactory.getConfiguration());
   }
 
-  public AbstractDFSCarbonFile(Path path, Configuration hadoopConf) {
+  AbstractDFSCarbonFile(Path path, Configuration hadoopConf) {
     this.hadoopConf = hadoopConf;
-    FileSystem fs;
     try {
-      fs = path.getFileSystem(this.hadoopConf);
-      fileStatus = fs.getFileStatus(path);
+      Path newPath = new Path(path.toString().replace("\\", "/"));
+      fileSystem = newPath.getFileSystem(this.hadoopConf);
+      this.path = newPath;
     } catch (IOException e) {
-      LOGGER.debug("Exception occurred:" + e.getMessage(), e);
+      throw new CarbonFileException("Error while getting File System: ", e);
     }
   }
 
-  public AbstractDFSCarbonFile(FileStatus fileStatus) {
-    this.hadoopConf = FileFactory.getConfiguration();
-    this.fileStatus = fileStatus;
+  AbstractDFSCarbonFile(FileStatus fileStatus) {
+    this(fileStatus.getPath());
   }
 
   @Override
   public boolean createNewFile() {
-    Path path = fileStatus.getPath();
-    FileSystem fs;
     try {
-      fs = fileStatus.getPath().getFileSystem(hadoopConf);
-      return fs.createNewFile(path);
+      return fileSystem.createNewFile(path);
     } catch (IOException e) {
-      return false;
+      throw new CarbonFileException("Unable to create file: " + 
path.toString(), e);
     }
   }
 
   @Override
   public String getAbsolutePath() {
-    return fileStatus.getPath().toString();
+    try {
+      return fileSystem.getFileStatus(path).getPath().toString();
+    } catch (IOException e) {
+      throw new CarbonFileException("Unable to get file status: ", e);
+    }
   }
 
   @Override
   public String getName() {
-    return fileStatus.getPath().getName();
+    return path.getName();
   }
 
   @Override
   public boolean isDirectory() {
-    return fileStatus.isDirectory();
+    try {
+      return fileSystem.getFileStatus(path).isDirectory();
 
 Review comment:
   Why remove the fileStatus member? Here it will call getFileStatus multiple 
times

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