ing

.gitignore

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+# Created by .ignore support plugin (hsz.mobi)
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff:
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/dictionaries
+
+# Sensitive or high-churn files:
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.xml
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+
+# Gradle:
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Mongo Explorer plugin:
+.idea/**/mongoSettings.xml
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+/out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+### Maven template
+
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+
+# Avoid ignoring Maven wrapper jar file (.jar files are usually ignored)
+!/.mvn/wrapper/maven-wrapper.jar
+### Java template
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+14
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+.idea/
+*.iml
+/target/
+.settings/
+.classpath
+.project

.vscode/launch.json

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+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+
+    {
+      "type": "java",
+      "name": "Debug",
+      "request": "launch",
+      "cwd": "${workspaceFolder}",
+      "console": "internalConsole",
+      "stopOnEntry": false,
+      "mainClass": "com.loafle.overflow.central.Central",
+      "projectName": "central",
+      "args": "50006"
+    },
+    {
+      "type": "java",
+      "name": "Debug (Attach)",
+      "request": "attach",
+      "hostName": "localhost",
+      "port": 0
+    }
+  ]
+}

.vscode/settings.json

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+{
+  "java.configuration.updateBuildConfiguration": "automatic"
+}

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>com.loafle</groupId>
+        <artifactId>maven_parent_jar</artifactId>
+        <version>1.0.0-RELEASE</version>
+    </parent>
+
+    <groupId>com.loafle.commons</groupId>
+    <artifactId>rpc-java</artifactId>
+    <packaging>jar</packaging>
+    <version>1.0.0-SNAPSHOT</version>
+    <name>com.loafle.commons.rpc-java</name>
+
+    <properties>
+        <gson.version>2.8.2</gson.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>${gson.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+    </build>
+</project>

src/main/java/com/loafle/commons/rpc/RPCException.java

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+package com.loafle.commons.rpc;
+
+/**
+ * RPCException
+ */
+public class RPCException extends Exception {
+
+}

src/main/java/com/loafle/commons/rpc/protocol/RPCError.java

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+package com.loafle.commons.rpc.protocol;
+
+/**
+ * Error
+ */
+public class RPCError {
+  public final int code;
+  public final String message;
+  public final Object data;
+
+		/**
+		 * Creates the error.
+		 *
+		 * @param code    the code
+		 * @param message the message
+		 * @param data    the data
+		 */
+		public RPCError(int code, String message, Object data) {
+			this.code = code;
+			this.message = message;
+			this.data = data;
+		}
+		
+		/**
+		 * @return the code
+		 */
+		int getCode() {
+			return code;
+		}
+		
+		/**
+		 * @return the message
+		 */
+		String getMessage() {
+			return message;
+		}
+		
+		/**
+		 * @return the data
+		 */
+		Object getData() {
+			return data;
+}
+}

src/main/java/com/loafle/commons/rpc/protocol/RPCRegistryCodec.java

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+package com.loafle.commons.rpc.protocol;
+
+import java.lang.reflect.Type;
+
+import com.loafle.commons.rpc.RPCException;
+
+/**
+ * RegistryCodec
+ */
+public interface RPCRegistryCodec {
+  String method();
+  Object[] params(Type[] paramTypes) throws RPCException;
+}

src/main/java/com/loafle/commons/rpc/protocol/RPCServerCodec.java

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+package com.loafle.commons.rpc.protocol;
+
+import com.loafle.commons.rpc.RPCException;
+
+/**
+ * ServerCodec
+ */
+public interface RPCServerCodec {
+  RPCServerRequestCodec request(byte[] buf) throws RPCException;
+  byte[] notification(String method, Object... params) throws RPCException;
+}

src/main/java/com/loafle/commons/rpc/protocol/RPCServerRequestCodec.java

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+package com.loafle.commons.rpc.protocol;
+
+import com.loafle.commons.rpc.RPCException;
+
+/**
+ * ServerRequestCodec
+ */
+public interface RPCServerRequestCodec extends RPCRegistryCodec {
+  boolean hasResponse();
+  byte[] response(Object reply, Error error) throws RPCException;
+}

src/main/java/com/loafle/commons/rpc/protocol/json/JSONRPC.java

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+package com.loafle.commons.rpc.protocol.json;
+
+/**
+ * JSONRPC
+ */
+public class JSONRPC {
+  public static final String version = "2.0";
+}

src/main/java/com/loafle/commons/rpc/protocol/json/JSONRPCServerCodec.java

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+package com.loafle.commons.rpc.protocol.json;
+
+import com.google.gson.Gson;
+import com.loafle.commons.rpc.RPCException;
+import com.loafle.commons.rpc.protocol.RPCServerCodec;
+import com.loafle.commons.rpc.protocol.RPCServerRequestCodec;
+
+/**
+ * JSONRPCServerCodec
+ */
+public class JSONRPCServerCodec implements RPCServerCodec {
+  private Gson gson;
+
+  public JSONRPCServerCodec() {
+    this.gson = new Gson();
+  }
+  public JSONRPCServerCodec(Gson gson) {
+    this.gson = gson;
+  }
+
+  public void setGson(Gson gson) {
+    this.gson = gson;
+  }
+
+  public Gson getGson() {
+    return this.gson;
+  }
+
+  public RPCServerRequestCodec request(byte[] buff) throws RPCException {
+    return new JSONRPCServerRequestCodec(this.gson, buff);
+  }
+
+  public byte[] notification(String method, Object... params) throws RPCException {
+    JSONServerNotification notification = new JSONServerNotification(method, params);
+    JSONServerResponse response = new JSONServerResponse(JSONRPC.version, notification, null);
+
+    String json = this.gson.toJson(response);
+    return json.getBytes();
+  }
+}

src/main/java/com/loafle/commons/rpc/protocol/json/JSONRPCServerRequestCodec.java

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+package com.loafle.commons.rpc.protocol.json;
+
+import java.lang.reflect.Type;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonSyntaxException;
+import com.loafle.commons.rpc.RPCException;
+import com.loafle.commons.rpc.protocol.RPCError;
+import com.loafle.commons.rpc.protocol.RPCServerRequestCodec;
+
+/**
+ * JSONRPCServerRequestCodec
+ */
+class JSONRPCServerRequestCodec implements RPCServerRequestCodec {
+  private Gson gson;
+  private JSONServerRequest request;
+
+  public JSONRPCServerRequestCodec(Gson gson, byte[] buff) throws RPCException {
+    this.gson = gson;
+    try {
+      this.request = this.gson.fromJson(new String(buff), JSONServerRequest.class);
+    } catch (JsonSyntaxException e) {
+      e.printStackTrace();
+    }
+  }
+
+  public String method() {
+    return this.request.method;
+  }
+
+  public Object[] params(Type[] paramTypes) throws RPCException {
+    if (null == paramTypes && null == this.request.params) {
+      return null;
+    }
+
+    if ((null != paramTypes && null == this.request.params) || null == paramTypes && null != this.request.params) {
+      throw new RPCException();
+    }
+
+    if (paramTypes.length != this.request.params.size()) {
+      throw new RPCException();
+    }
+
+    Object[] result = new Object[paramTypes.length];
+
+    for (int i = 0; i < paramTypes.length; i++) {
+      Type paramType = paramTypes[i];
+      String param = this.request.params.get(i);
+
+      result[i] = this.gson.fromJson(param, paramType);
+    }
+
+    return result;
+  }
+
+  public boolean hasResponse() {
+    return null != this.request.id;
+  }
+
+  public byte[] response(Object reply, Error error) throws RPCException {
+    RPCError rpcError = null;
+    if (null != error) {
+      rpcError = new RPCError(1, "", error);
+    }
+    JSONServerResponse response = new JSONServerResponse(JSONRPC.version, reply, rpcError);
+    response.id = this.request.id;
+
+    String json = this.gson.toJson(response);
+    return json.getBytes();
+  }
+}

src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerNotification.java

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+package com.loafle.commons.rpc.protocol.json;
+
+import com.google.gson.annotations.SerializedName;
+
+/**
+ * JSONServerNotification
+ */
+class JSONServerNotification {
+  @SerializedName("method")
+  public String method;
+
+  @SerializedName("params")
+  public Object[] params;
+
+  JSONServerNotification(String method, Object[] params) {
+    this.method = method;
+    this.params = params;
+  }
+}

src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerRequest.java

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+package com.loafle.commons.rpc.protocol.json;
+
+import java.util.List;
+
+import com.google.gson.annotations.SerializedName;
+
+/**
+ * JSONServerRequest
+ */
+class JSONServerRequest {
+  @SerializedName("jsonrpc")
+  public String version;
+
+  @SerializedName("method")
+  public String method;
+
+  @SerializedName("params")
+  public List<String> params;
+
+  @SerializedName("id")
+  public Object id;
+
+}

src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerResponse.java

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+package com.loafle.commons.rpc.protocol.json;
+
+import com.google.gson.annotations.SerializedName;
+import com.loafle.commons.rpc.protocol.RPCError;
+
+/**
+ * JSONServerResponse
+ */
+class JSONServerResponse {
+  @SerializedName("jsonrpc")
+  public String version;
+
+  @SerializedName("result")
+  public Object result;
+
+  @SerializedName("error")
+  public RPCError error;
+
+  @SerializedName("id")
+  public Object id;
+
+  JSONServerResponse(String version, Object result, RPCError error) {
+    this(version, result, error, null);
+  }
+
+  JSONServerResponse(String version, Object result, RPCError error, Object id) {
+    this.version = version;
+    this.result = result;
+    this.error = error;
+    this.id = id;
+  }
+}

src/main/java/com/loafle/commons/rpc/registry/RPCInvoker.java

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+package com.loafle.commons.rpc.registry;
+
+import com.loafle.commons.rpc.RPCException;
+import com.loafle.commons.rpc.protocol.RPCRegistryCodec;
+
+/**
+ * RPCInvoker
+ */
+public interface RPCInvoker {
+  boolean hasMethod(String method);
+  Object invoke(RPCRegistryCodec codec, Object... leadingParams) throws RPCException;
+}

src/main/java/com/loafle/commons/rpc/registry/RPCRegistry.java

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+package com.loafle.commons.rpc.registry;
+
+import java.util.Map;
+
+import com.loafle.commons.rpc.RPCException;
+
+/**
+ * RPCRegistry
+ */
+public interface RPCRegistry extends RPCInvoker {
+  Object getService(String name);
+	void registerService(Object receiver, String name) throws RPCException;
+	void registerServices(Object... receivers) throws RPCException;
+	void registerServices(Map<String, Object> receivers) throws RPCException;
+}

src/test/resources/logback.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="3 seconds">
+    <contextName>commons_java</contextName>
+    <!-- TRACE > DEBUG > INFO > WARN > ERROR -->
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>
+                %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{32} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="DEBUG">
+        <appender-ref ref="STDOUT" />
+    </root>
+    <logger name="com.loafle.overflow" level="ALL" />
+</configuration>