init

.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/LRUCache.iml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="Go" enabled="true" />
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/LRUCache.iml" filepath="$PROJECT_DIR$/.idea/LRUCache.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

go.mod

@@ -0,0 +1,3 @@
+module github.com/doublepi123/LRUCache
+
+go 1.14

lru.go

@@ -0,0 +1,42 @@
+package LRUCache
+
+import "container/list"
+
+type item struct {
+	key   string
+	value string
+	pos   *list.Element
+}
+
+type LRU struct {
+	ul      list.List
+	data    map[string]*item
+	Maxsize int
+}
+
+func (lru LRU) Get(key string) string {
+	i := lru.data[key]
+	if i != nil {
+		lru.ul.Remove(i.pos)
+		lru.ul.PushBack(i)
+		return i.value
+	} else {
+		return ""
+	}
+}
+
+func (lru LRU) Set(key string, value string) {
+	i := &item{key: key, value: value}
+	lru.data[key] = i
+	lru.ul.Remove(i.pos)
+	lru.ul.PushBack(i)
+	if lru.ul.Len() > lru.Maxsize {
+		lru.ul.Remove(lru.ul.Front())
+	}
+	i.pos = lru.ul.Back()
+}
+
+func (lru LRU) init() {
+	lru.data = make(map[string]*item)
+	lru.ul = list.List{}
+}