1.0

旧的java项目/itcast/server/session/Group.java

@@ -0,0 +1,24 @@
+package cn.itcast.server.session;
+
+import lombok.Data;
+
+import java.util.Collections;
+import java.util.Set;
+
+@Data
+/**
+ * 聊天组，即聊天室
+ */
+public class Group {
+    // 聊天室名称
+    private String name;
+    // 聊天室成员
+    private Set<String> members;
+
+    public static final Group EMPTY_GROUP = new Group("empty", Collections.emptySet());
+
+    public Group(String name, Set<String> members) {
+        this.name = name;
+        this.members = members;
+    }
+}

旧的java项目/itcast/server/session/GroupSession.java

@@ -0,0 +1,57 @@
+package cn.itcast.server.session;
+
+import io.netty.channel.Channel;
+
+import java.util.List;
+import java.util.Set;
+
+/**
+ * 聊天组会话管理接口
+ */
+public interface GroupSession {
+
+    /**
+     * 创建一个聊天组, 如果不存在才能创建成功, 否则返回 null
+     * @param name 组名
+     * @param members 成员
+     * @return 成功时返回组对象, 失败返回 null
+     */
+    Group createGroup(String name, Set<String> members);
+
+    /**
+     * 加入聊天组
+     * @param name 组名
+     * @param member 成员名
+     * @return 如果组不存在返回 null, 否则返回组对象
+     */
+    Group joinMember(String name, String member);
+
+    /**
+     * 移除组成员
+     * @param name 组名
+     * @param member 成员名
+     * @return 如果组不存在返回 null, 否则返回组对象
+     */
+    Group removeMember(String name, String member);
+
+    /**
+     * 移除聊天组
+     * @param name 组名
+     * @return 如果组不存在返回 null, 否则返回组对象
+     */
+    Group removeGroup(String name);
+
+    /**
+     * 获取组成员
+     * @param name 组名
+     * @return 成员集合, 没有成员会返回 empty set
+     */
+    Set<String> getMembers(String name);
+
+    /**
+     * 获取组成员的 channel 集合, 只有在线的 channel 才会返回
+     * @param name 组名
+     * @return 成员 channel 集合
+     */
+    List<Channel> getMembersChannel(String name);
+}

旧的java项目/itcast/server/session/GroupSessionFactory.java

@@ -0,0 +1,10 @@
+package cn.itcast.server.session;
+
+public abstract class GroupSessionFactory {
+
+    private static GroupSession session = new GroupSessionMemoryImpl();
+
+    public static GroupSession getGroupSession() {
+        return session;
+    }
+}

旧的java项目/itcast/server/session/GroupSessionMemoryImpl.java

@@ -0,0 +1,55 @@
+package cn.itcast.server.session;
+
+import io.netty.channel.Channel;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.stream.Collectors;
+
+public class GroupSessionMemoryImpl implements GroupSession {
+    private final Map<String, Group> groupMap = new ConcurrentHashMap<>();
+
+    @Override
+    public Group createGroup(String name, Set<String> members) {
+        Group group = new Group(name, members);
+        return groupMap.putIfAbsent(name, group);
+    }
+
+    @Override
+    public Group joinMember(String name, String member) {
+        return groupMap.computeIfPresent(name, (key, value) -> {
+//            value.getMembers().add(member);
+            return value;
+        });
+    }
+
+    @Override
+    public Group removeMember(String name, String member) {
+        return groupMap.computeIfPresent(name, (key, value) -> {
+//            value.getMembers().remove(member);
+            return value;
+        });
+    }
+
+    @Override
+    public Group removeGroup(String name) {
+        return groupMap.remove(name);
+    }
+
+    @Override
+    public Set<String> getMembers(String name) {
+//        return groupMap.getOrDefault(name, Group.EMPTY_GROUP).getMembers();
+        return null;
+    }
+
+    @Override
+    public List<Channel> getMembersChannel(String name) {
+        return getMembers(name).stream()
+                .map(member -> SessionFactory.getSession().getChannel(member))
+                .filter(Objects::nonNull)
+                .collect(Collectors.toList());
+    }
+}

旧的java项目/itcast/server/session/Session.java

@@ -0,0 +1,46 @@
+package cn.itcast.server.session;
+
+
+import io.netty.channel.Channel;
+
+/**
+ * 会话管理接口
+ */
+public interface Session {
+
+    /**
+     * 绑定会话
+     * @param channel 哪个 channel 要绑定会话
+     * @param username 会话绑定用户
+     */
+    void bind(Channel channel, String username);
+
+    /**
+     * 解绑会话
+     * @param channel 哪个 channel 要解绑会话
+     */
+    void unbind(Channel channel);
+
+    /**
+     * 获取属性
+     * @param channel 哪个 channel
+     * @param name 属性名
+     * @return 属性值
+     */
+    Object getAttribute(Channel channel, String name);
+
+    /**
+     * 设置属性
+     * @param channel 哪个 channel
+     * @param name 属性名
+     * @param value 属性值
+     */
+    void setAttribute(Channel channel, String name, Object value);
+
+    /**
+     * 根据用户名获取 channel
+     * @param username 用户名
+     * @return channel
+     */
+    Channel getChannel(String username);
+}

旧的java项目/itcast/server/session/SessionFactory.java

@@ -0,0 +1,10 @@
+package cn.itcast.server.session;
+
+public abstract class SessionFactory {
+
+    private static Session session = new SessionMemoryImpl();
+
+    public static Session getSession() {
+        return session;
+    }
+}

旧的java项目/itcast/server/session/SessionMemoryImpl.java

@@ -0,0 +1,47 @@
+package cn.itcast.server.session;
+
+import io.netty.channel.Channel;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class SessionMemoryImpl implements Session {
+
+    private final Map<String, Channel> usernameChannelMap = new ConcurrentHashMap<>();
+    private final Map<Channel, String> channelUsernameMap = new ConcurrentHashMap<>();
+    private final Map<Channel,Map<String,Object>> channelAttributesMap = new ConcurrentHashMap<>();
+
+    @Override
+    public void bind(Channel channel, String username) {
+        usernameChannelMap.put(username, channel);
+        channelUsernameMap.put(channel, username);
+        channelAttributesMap.put(channel, new ConcurrentHashMap<>());
+    }
+
+    @Override
+    public void unbind(Channel channel) {
+        String username = channelUsernameMap.remove(channel);
+        usernameChannelMap.remove(username);
+        channelAttributesMap.remove(channel);
+    }
+
+    @Override
+    public Object getAttribute(Channel channel, String name) {
+        return channelAttributesMap.get(channel).get(name);
+    }
+
+    @Override
+    public void setAttribute(Channel channel, String name, Object value) {
+        channelAttributesMap.get(channel).put(name, value);
+    }
+
+    @Override
+    public Channel getChannel(String username) {
+        return usernameChannelMap.get(username);
+    }
+
+    @Override
+    public String toString() {
+        return usernameChannelMap.toString();
+    }
+}