sijie commented on a change in pull request #1281: Issue #570: Introducing 
EntryLogManager.
URL: https://github.com/apache/bookkeeper/pull/1281#discussion_r180944411
 
 

 ##########
 File path: 
bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/EntryLogger.java
 ##########
 @@ -788,89 +852,340 @@ private long readLastLogId(File f) {
         }
     }
 
-    /**
-     * Flushes all rotated log channels. After log channels are flushed,
-     * move leastUnflushedLogId ptr to current logId.
-     */
-    void checkpoint() throws IOException {
-        flushRotatedLogs();
+    interface EntryLogManager {
+
+        /*
+         * add entry to the corresponding entrylog and return the position of
+         * the entry in the entrylog
+         */
+        long addEntry(Long ledger, ByteBuf entry, boolean rollLog) throws 
IOException;
+
+        /*
+         * gets the active logChannel with the given entryLogId. null if it is
+         * not existing.
+         */
+        BufferedLogChannel getCurrentLogIfPresent(long entryLogId);
+
+        /*
+         * Returns eligible writable ledger dir for the creation next entrylog
+         */
+        File getDirForNextEntryLog(List<File> writableLedgerDirs);
+
+        /*
+         * Do the operations required for checkpoint.
+         */
+        void checkpoint() throws IOException;
+
+        /*
+         * roll entryLogs.
+         */
+        void rollLogs() throws IOException;
+
+        /*
+         * flush rotated logs.
+         */
+        void flushRotatedLogs() throws IOException;
+
+        /*
+         * flush current logs.
+         */
+        void flushCurrentLogs() throws IOException;
+
+        /*
+         * close current logs.
+         */
+        void closeCurrentLogs() throws IOException;
+
+        /*
+         * force close current logs.
+         */
+        void forceCloseCurrentLogs();
+
+        /*
+         * this method should be called before doing entrymemtable flush, it
+         * would save the state of the entrylogger before entrymemtable flush
+         * and commitEntryMemTableFlush would take appropriate action after
+         * entrymemtable flush.
+         */
+        void prepareEntryMemTableFlush();
+
         /*
-         * In the case of entryLogPerLedgerEnabled we need to flush both
-         * rotatedlogs and currentlogs. This is needed because syncThread
-         * periodically does checkpoint and at this time all the logs should
-         * be flushed.
+         * this method should be called after doing entrymemtable flush,it 
would
+         * take appropriate action after entrymemtable flush depending on the
+         * current state of the entrylogger and the state of the entrylogger
+         * during prepareEntryMemTableFlush.
          *
-         * TODO: When EntryLogManager is introduced in the subsequent 
sub-tasks of
-         * this Issue, I will move this logic to individual implamentations of
-         * EntryLogManager and it would be free of this booalen flag based 
logic.
+         * It is assumed that there would be corresponding
+         * prepareEntryMemTableFlush for every commitEntryMemTableFlush and 
both
+         * would be called from the same thread.
          *
+         * returns boolean value indicating whether EntryMemTable should do 
checkpoint
+         * after this commit method.
          */
-        if (entryLogPerLedgerEnabled) {
-            flushCurrentLog();
-        }
+        boolean commitEntryMemTableFlush() throws IOException;
     }
 
-    void flushRotatedLogs() throws IOException {
-        List<BufferedLogChannel> channels = null;
-        long flushedLogId = INVALID_LID;
-        synchronized (this) {
-            channels = logChannelsToFlush;
-            logChannelsToFlush = null;
+    abstract class EntryLogManagerBase implements EntryLogManager {
+        final Set<BufferedLogChannel> rotatedLogChannels;
 
 Review comment:
   >  it is incorrect to have non-synchronized version of List for 
rotatedLogChannels. I'll use CopyOnWriteArrayList, so that the list can be 
modified while its iterator is being used.
   
   why? the original code is synchronizing the rotatedLogChannels list 
properly. If you just move the logic into the abstraction, this logic should 
work. 

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