chore: 导入后端 s-file(alita-bjy-uygur, f分支)至 backend/

backend/src/main/java/com/senmesh/common/cache/DefaultCacheProvider.java

@@ -0,0 +1,31 @@
+package com.senmesh.common.cache;
+
+import java.util.Map;
+
+import org.apache.commons.collections.MapUtils;
+
+import com.google.common.collect.Maps;
+
+/**
+ * @author sr on 2020-07-07
+ */
+public class DefaultCacheProvider implements ICacheProvider {
+
+  private Map<String, Long> numLimitMap = Maps.newConcurrentMap();
+
+  @Override
+  public boolean outLimit(final String key, Long maxNumLimit) {
+    Long currentNumLimit = null;
+    final Object lockKey = key.intern();
+    synchronized (lockKey) {
+      currentNumLimit = MapUtils.getLong(numLimitMap, key, 0L);
+      if (currentNumLimit >= maxNumLimit) {
+        return true;
+      }
+      currentNumLimit++;
+      numLimitMap.put(key, currentNumLimit);
+    }
+    return false;
+  }
+  
+}