8294037: Using alias template to unify hashtables in AsyncLogWriter

Reviewed-by: coleenp, simonis

Author: Xin Liu

src/hotspot/share/logging/logAsyncWriter.cpp

@@ -116,10 +116,7 @@ AsyncLogWriter::AsyncLogWriter()
 
 void AsyncLogWriter::write() {
   ResourceMark rm;
-  // Similar to AsyncLogMap but on resource_area
-  ResourceHashtable<LogFileStreamOutput*, uint32_t,
-                          17/*table_size*/, ResourceObj::RESOURCE_AREA,
-                          mtLogging> snapshot;
+  AsyncLogMap<ResourceObj::RESOURCE_AREA> snapshot;
 
   // lock protection. This guarantees I/O jobs don't block logsites.
   {

src/hotspot/share/logging/logAsyncWriter.hpp

@@ -58,11 +58,12 @@ class AsyncLogWriter : public NonJavaThread {
   friend class AsyncLogTest;
   friend class AsyncLogTest_logBuffer_vm_Test;
   class AsyncLogLocker;
+
+  // account for dropped messages
+  template <ResourceObj::allocation_type ALLOC_TYPE>
   using AsyncLogMap = ResourceHashtable<LogFileStreamOutput*,
-                          uint32_t,
-                          17, /*table_size*/
-                          ResourceObj::C_HEAP,
-                          mtLogging>;
+                          uint32_t, 17, /*table_size*/
+                          ALLOC_TYPE, mtLogging>;
 
   // Messsage is the envelop of a log line and its associative data.
   // Its length is variable because of the zero-terminated c-str. It is only valid when we create it using placement new
@@ -154,7 +155,7 @@ class AsyncLogWriter : public NonJavaThread {
   PlatformMonitor _lock;
   bool _data_available;
   volatile bool _initialized;
-  AsyncLogMap _stats; // statistics for dropped messages
+  AsyncLogMap<ResourceObj::C_HEAP> _stats;
 
   // ping-pong buffers
   Buffer* _buffer;