diff --git a/server/src/main/java/com/github/dtprj/dongting/raft/store/ChainWriter.java b/server/src/main/java/com/github/dtprj/dongting/raft/store/ChainWriter.java
index c8e5db33..e3bd44fb 100644
--- a/server/src/main/java/com/github/dtprj/dongting/raft/store/ChainWriter.java
+++ b/server/src/main/java/com/github/dtprj/dongting/raft/store/ChainWriter.java
@@ -32,16 +32,19 @@
 
 import java.nio.ByteBuffer;
 import java.util.LinkedList;
+import java.util.function.Consumer;
 import java.util.function.Supplier;
 
 /**
  * @author huangli
  */
-public abstract class ChainWriter {
+public class ChainWriter {
     private static final DtLog log = DtLogs.getLogger(ChainWriter.class);
 
     private final PerfCallback perfCallback;
     private final RaftGroupConfigEx config;
+    private final Consumer<WriteTask> writeCallback;
+    private final Consumer<WriteTask> forceCallback;
 
     private int writePerfType1;
     private int writePerfType2;
@@ -62,9 +65,13 @@ public abstract class ChainWriter {
 
     private boolean close;
 
-    public ChainWriter(String fiberNamePrefix, RaftGroupConfigEx config) {
+    public ChainWriter(String fiberNamePrefix, RaftGroupConfigEx config, Consumer<WriteTask> writeCallback,
+                       Consumer<WriteTask> forceCallback) {
         this.config = config;
         this.perfCallback = config.getPerfCallback();
+        this.writeCallback = writeCallback;
+        this.forceCallback = forceCallback;
+
         DispatcherThread t = config.getFiberGroup().getThread();
         this.directPool = t.getDirectPool();
         this.needForceCondition = config.getFiberGroup().newCondition("needForceCond");
@@ -72,10 +79,6 @@ public ChainWriter(String fiberNamePrefix, RaftGroupConfigEx config) {
                 new ForceLoopFrame());
     }
 
-    protected abstract void writeFinish(WriteTask writeTask);
-
-    protected abstract void forceFinish(WriteTask writeTask);
-
     public void start() {
         forceFiber.start();
     }
@@ -187,7 +190,9 @@ private void afterWrite(Throwable ioEx, WriteTask task, long startTime) {
         }
         if (lastTaskNeedCallback != null) {
             needForceCondition.signal();
-            writeFinish(lastTaskNeedCallback);
+            if (writeCallback != null) {
+                writeCallback.accept(lastTaskNeedCallback);
+            }
         }
     }
 
@@ -256,7 +261,7 @@ private FrameCallResult afterForce(WriteTask task, long perfStartTime) {
                 return Fiber.frameReturn();
             }
 
-            forceFinish(task);
+            forceCallback.accept(task);
             return Fiber.resume(null, this);
         }
     }
diff --git a/server/src/main/java/com/github/dtprj/dongting/raft/store/IdxFileQueue.java b/server/src/main/java/com/github/dtprj/dongting/raft/store/IdxFileQueue.java
index 7d7f91f6..4f5b3ee9 100644
--- a/server/src/main/java/com/github/dtprj/dongting/raft/store/IdxFileQueue.java
+++ b/server/src/main/java/com/github/dtprj/dongting/raft/store/IdxFileQueue.java
@@ -75,7 +75,7 @@ class IdxFileQueue extends FileQueue implements IdxOps {
     private final FiberCondition needFlushCondition;
     final FiberCondition flushDoneCondition;
 
-    final IdxChainWriter chainWriter;
+    final ChainWriter chainWriter;
 
     private boolean closed;
 
@@ -99,7 +99,7 @@ public IdxFileQueue(File dir, StatusManager statusManager, RaftGroupConfigEx gro
         this.needFlushCondition = groupConfig.getFiberGroup().newCondition("IdxNeedFlush-" + groupConfig.getGroupId());
         this.flushDoneCondition = groupConfig.getFiberGroup().newCondition("IdxFlushDone-" + groupConfig.getGroupId());
 
-        this.chainWriter = new IdxChainWriter(groupConfig);
+        this.chainWriter = new ChainWriter("IdxForce", groupConfig, null, this::forceFinish);
         chainWriter.setWritePerfType1(0);
         chainWriter.setWritePerfType2(PerfConsts.RAFT_D_IDX_WRITE);
         chainWriter.setForcePerfType(PerfConsts.RAFT_D_IDX_FORCE);
@@ -171,28 +171,15 @@ protected FrameCallResult handle(Throwable ex) throws Throwable {
         }
     }
 
-    class IdxChainWriter extends ChainWriter {
-
-        public IdxChainWriter(RaftGroupConfigEx config) {
-            super("IdxForce", config);
-        }
-
-        @Override
-        protected void writeFinish(WriteTask writeTask) {
-            // nothing to do
-        }
-
-        @Override
-        protected void forceFinish(WriteTask writeTask) {
-            // if we set syncForce to false, lastRaftIndex(committed) may less than lastForceLogIndex
-            long idx = Math.min(writeTask.getLastRaftIndex(), raftStatus.getLastForceLogIndex());
-            if (idx > persistedIndexInStatusFile && !raftStatus.isInstallSnapshot()) {
-                statusManager.getProperties().put(KEY_PERSIST_IDX_INDEX, String.valueOf(idx));
-                statusManager.persistAsync(true);
-            }
-            persistedIndex = writeTask.getLastRaftIndex();
-            flushDoneCondition.signalAll();
+    private void forceFinish(ChainWriter.WriteTask writeTask) {
+        // if we set syncForce to false, lastRaftIndex(committed) may less than lastForceLogIndex
+        long idx = Math.min(writeTask.getLastRaftIndex(), raftStatus.getLastForceLogIndex());
+        if (idx > persistedIndexInStatusFile && !raftStatus.isInstallSnapshot()) {
+            statusManager.getProperties().put(KEY_PERSIST_IDX_INDEX, String.valueOf(idx));
+            statusManager.persistAsync(true);
         }
+        persistedIndex = writeTask.getLastRaftIndex();
+        flushDoneCondition.signalAll();
     }
 
     public long indexToPos(long index) {
diff --git a/server/src/main/java/com/github/dtprj/dongting/raft/store/LogFileQueue.java b/server/src/main/java/com/github/dtprj/dongting/raft/store/LogFileQueue.java
index 8b19debd..e7a732f9 100644
--- a/server/src/main/java/com/github/dtprj/dongting/raft/store/LogFileQueue.java
+++ b/server/src/main/java/com/github/dtprj/dongting/raft/store/LogFileQueue.java
@@ -73,33 +73,24 @@ public LogFileQueue(File dir, RaftGroupConfigEx groupConfig, IdxOps idxOps, long
         this.heapPool = t.getHeapPool();
         this.directPool = t.getDirectPool();
 
-        LogChainWriter chainWriter = new LogChainWriter(groupConfig);
+        ChainWriter chainWriter = new ChainWriter("LogForce", groupConfig, this::writeFinish, this::forceFinish);
         chainWriter.setWritePerfType1(PerfConsts.RAFT_D_LOG_WRITE1);
         chainWriter.setWritePerfType2(PerfConsts.RAFT_D_LOG_WRITE2);
         chainWriter.setForcePerfType(PerfConsts.RAFT_D_LOG_SYNC);
         this.logAppender = new LogAppender(idxOps, this, groupConfig, chainWriter);
     }
 
-    private class LogChainWriter extends ChainWriter {
-
-        public LogChainWriter(RaftGroupConfigEx config) {
-            super("LogForce", config);
-        }
-
-        @Override
-        protected void writeFinish(WriteTask writeTask) {
-            if (writeTask.getLastRaftIndex() > 0) {
-                raftStatus.getLogWriteFinishCondition().signalAll();
-                raftStatus.setLastWriteLogIndex(writeTask.getLastRaftIndex());
-            }
+    private void writeFinish(ChainWriter.WriteTask writeTask) {
+        if (writeTask.getLastRaftIndex() > 0) {
+            raftStatus.getLogWriteFinishCondition().signalAll();
+            raftStatus.setLastWriteLogIndex(writeTask.getLastRaftIndex());
         }
+    }
 
-        @Override
-        protected void forceFinish(WriteTask writeTask) {
-            // assert lastRaftIndex > 0
-            raftStatus.setLastForceLogIndex(writeTask.getLastRaftIndex());
-            raftStatus.getLogForceFinishCondition().signalAll();
-        }
+    private void forceFinish(ChainWriter.WriteTask writeTask) {
+        // assert lastRaftIndex > 0
+        raftStatus.setLastForceLogIndex(writeTask.getLastRaftIndex());
+        raftStatus.getLogForceFinishCondition().signalAll();
     }
 
     public long fileLength() {