Merge pull request #66 from GravityMatrix/feature/deque替换stack

使用Deque替换Stack

bizlog-sdk/src/main/java/com/mzt/logapi/context/LogRecordContext.java

@@ -2,37 +2,35 @@
 
 import com.google.common.collect.Maps;
 
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Stack;
+import java.util.*;
 
 /**
  * @author muzhantong
  * create on 2021/2/9 2:22 下午
  */
 public class LogRecordContext {
 
-    private static final InheritableThreadLocal<Stack<Map<String, Object>>> variableMapStack = new InheritableThreadLocal<>();
+    private static final InheritableThreadLocal<Deque<Map<String, Object>>> variableMapStack = new InheritableThreadLocal<>();
 
     public static void putVariable(String name, Object value) {
         if (variableMapStack.get() == null) {
-            Stack<Map<String, Object>> stack = new Stack<>();
+            Deque<Map<String, Object>> stack = new ArrayDeque<>();
             variableMapStack.set(stack);
         }
-        Stack<Map<String, Object>> mapStack = variableMapStack.get();
+        Deque<Map<String, Object>> mapStack = variableMapStack.get();
         if (mapStack.size() == 0) {
-            variableMapStack.get().push(new HashMap<>());
+            variableMapStack.get().push(Maps.newHashMap());
         }
-        variableMapStack.get().peek().put(name, value);
+        variableMapStack.get().element().put(name, value);
     }
 
     public static Object getVariable(String key) {
         Map<String, Object> variableMap = variableMapStack.get().peek();
-        return variableMap.get(key);
+        return variableMap == null ? null : variableMap.get(key);
     }
 
     public static Map<String, Object> getVariables() {
-        Stack<Map<String, Object>> mapStack = variableMapStack.get();
+        Deque<Map<String, Object>> mapStack = variableMapStack.get();
         return mapStack.peek();
     }
 
@@ -47,9 +45,9 @@ public static void clear() {
      * 每进入一个方法初始化一个 span 放入到 stack中，方法执行完后 pop 掉这个span
      */
     public static void putEmptySpan() {
-        Stack<Map<String, Object>> mapStack = variableMapStack.get();
+        Deque<Map<String, Object>> mapStack = variableMapStack.get();
         if (mapStack == null) {
-            Stack<Map<String, Object>> stack = new Stack<>();
+            Deque<Map<String, Object>> stack = new ArrayDeque<>();
             variableMapStack.set(stack);
         }
         variableMapStack.get().push(Maps.newHashMap());