[jira] [Created] (HDFS-16718) Improve Code with Lambda in org.apahce.hadoop.hdfs.server.datanode packages

["ZanderXu (Jira)" <ji...@apache.org>]

ZanderXu created HDFS-16718:
-------------------------------

             Summary: Improve Code with Lambda in org.apahce.hadoop.hdfs.server.datanode packages
                 Key: HDFS-16718
                 URL: https://issues.apache.org/jira/browse/HDFS-16718
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: ZanderXu
            Assignee: ZanderXu


Improve Code with Lambda in org.apahce.hadoop.hdfs.server.datanode packages.

For example:
Current logic:
{code:java}
synchronized void startAll() throws IOException {
  try {
    UserGroupInformation.getLoginUser().doAs(
        new PrivilegedExceptionAction<Object>() {
          @Override
          public Object run() throws Exception {
            for (BPOfferService bpos : offerServices) {
              bpos.start();
            }
            return null;
          }
        });
  } catch (InterruptedException ex) {
    IOException ioe = new IOException();
    ioe.initCause(ex.getCause());
    throw ioe;
  }
}{code}
Improved Code with Lambda:
{code:java}
synchronized void startAll() throws IOException {
  try {
    UserGroupInformation.getLoginUser().doAs(
        (PrivilegedExceptionAction<Object>) () -> {
          for (BPOfferService bpos : offerServices) {
            bpos.start();
          }
          return null;
        });
  } catch (InterruptedException ex) {
    IOException ioe = new IOException();
    ioe.initCause(ex.getCause());
    throw ioe;
  }
}{code}
 



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