增加新的插件skywalking-httpClient-4.x-plugin-dubbox-rest-attachment，用于适配httpClient-4...

增加新的插件skywalking-httpClient-4.x-plugin-dubbox-rest-attachment，用于适配httpClient-4.x插件，用于支持调用dubbox-rest模式提供的服务。

skywalking-api/src/main/java/com/ai/cloud/skywalking/plugin/PluginCfg.java

@@ -6,7 +6,6 @@ import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Set;
 
 import com.ai.cloud.skywalking.util.StringUtil;
 

skywalking-api/src/main/java/com/ai/cloud/skywalking/plugin/interceptor/EnhanceClazz4Interceptor.java

@@ -21,6 +21,7 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import com.ai.cloud.skywalking.plugin.PluginCfg;
+import com.ai.cloud.skywalking.util.StringUtil;
 
 public class EnhanceClazz4Interceptor {
 	private static Logger logger = LogManager
@@ -57,6 +58,11 @@ public class EnhanceClazz4Interceptor {
 				interceptorDefineClassName).newInstance();
 
 		String enhanceOriginClassName = define.getBeInterceptedClassName();
+		if(StringUtil.isEmpty(enhanceOriginClassName)){
+			logger.warn("classname of being intercepted is not defined by {}.",
+					interceptorDefineClassName);
+			return;
+		}
 
 		logger.debug("prepare to enhance class {} by {}.",
 				enhanceOriginClassName, interceptorDefineClassName);

skywalking-sdk-plugin/pom.xml

 <?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">
+<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>
 
 	<groupId>com.ai.cloud</groupId>
@@ -13,8 +14,9 @@
 		<module>web-plugin</module>
 		<module>httpclient-4.2.x-plugin</module>
 		<module>httpclient-4.3.x-plugin</module>
-    	<module>httpClient-4.x-plugin</module>
-  </modules>
+		<module>httpClient-4.x-plugin</module>
+		<module>httpClient-4.x-plugin-dubbox-rest-attachment</module>
+	</modules>
 	<packaging>pom</packaging>
 
 	<name>skywalking-sdk-plugin</name>

skywalking-sdk-plugin/skywalking-httpClient-4.x-plugin-dubbox-rest-attachment/pom.xml

+<?xml version="1.0"?>
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>com.ai.cloud</groupId>
+		<artifactId>skywalking-sdk-plugin</artifactId>
+		<version>1.0-SNAPSHOT</version>
+	</parent>
+	
+	<artifactId>skywalking-httpClient-4.x-plugin-dubbox-rest-attachment</artifactId>
+	<packaging>jar</packaging>
+
+    <name>httpclient-4.x-plugin</name>
+    <url>http://maven.apache.org</url>
+    
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+  
+  <dependencies>
+		<dependency>
+			<groupId>com.ai.cloud</groupId>
+			<artifactId>skywalking-httpClient-4.x-plugin</artifactId>
+			<version>1.0-SNAPSHOT</version>
+			<scope>compile</scope>
+		</dependency>
+		
+		
+		<dependency>
+			<groupId>org.apache.httpcomponents</groupId>
+			<artifactId>httpclient</artifactId>
+			<version>4.3</version>
+			<scope>test</scope>
+		</dependency>
+		<!-- 
+		<dependency>
+			<groupId>org.apache.httpcomponents</groupId>
+			<artifactId>httpclient</artifactId>
+			<version>4.2</version>
+			<scope>test</scope>
+		</dependency>
+		-->
+		
+		<dependency>
+			<groupId>org.apache.logging.log4j</groupId>
+			<artifactId>log4j-core</artifactId>
+			<version>2.4.1</version>
+			<scope>test</scope>
+		</dependency>
+	
+		<dependency>
+			<groupId>junit</groupId>
+			<artifactId>junit</artifactId>
+			<version>4.12</version>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+	<build>
+		<plugins>
+			<plugin>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<configuration>
+					<source>1.7</source>
+					<target>1.7</target>
+					<encoding>${project.build.sourceEncoding}</encoding>
+				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-resources-plugin</artifactId>
+				<version>2.4.3</version>
+				<configuration>
+					<encoding>${project.build.sourceEncoding}</encoding>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+</project>

skywalking-sdk-plugin/skywalking-httpClient-4.x-plugin-dubbox-rest-attachment/src/main/java/org/skywalking/httpClient/v4/plugin/dubbox/rest/attachment/DubboxRestHeadSetterAttachment.java

+package org.skywalking.httpClient.v4.plugin.dubbox.rest.attachment;
+
+import org.skywalking.httpClient.v4.plugin.HttpClientExecuteInterceptor;
+
+import com.ai.cloud.skywalking.plugin.interceptor.IAroundInterceptor;
+import com.ai.cloud.skywalking.plugin.interceptor.InterceptPoint;
+import com.ai.cloud.skywalking.plugin.interceptor.InterceptorDefine;
+
+public class DubboxRestHeadSetterAttachment implements InterceptorDefine {
+
+	/**
+	 * this method is called as InterceptorDefine<br/>
+	 * don't return be intercepted classname, <br/>
+	 * just run as a pre setter of attribute:HttpClientExecuteInterceptor.TRACE_HEAD_NAME
+	 */
+	@Override
+	public String getBeInterceptedClassName() {
+		HttpClientExecuteInterceptor.TRACE_HEAD_NAME = "Dubbo-Attachments";
+		return null;
+	}
+
+	@Override
+	public InterceptPoint[] getBeInterceptedMethods() {
+		return null;
+	}
+
+	@Override
+	public IAroundInterceptor instance() {
+		return null;
+	}
+
+}

skywalking-sdk-plugin/skywalking-httpClient-4.x-plugin-dubbox-rest-attachment/src/main/resources/skywalking-plugin.def

+org.skywalking.httpClient.v4.plugin.dubbox.rest.attachment.DubboxRestHeadSetterAttachment
\ No newline at end of file

skywalking-sdk-plugin/skywalking-httpClient-4.x-plugin-dubbox-rest-attachment/src/test/java/test/skywalking/httpClient/v4x/plugin/dubbox/rest/attachment/TestHttpClientV43.java

+package test.skywalking.httpClient.v4x.plugin.dubbox.rest.attachment;
+
+import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.sql.SQLException;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpResponse;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.apache.http.util.EntityUtils;
+import org.junit.Test;
+
+import com.ai.cloud.skywalking.plugin.TracingBootstrap;
+
+public class TestHttpClientV43 {
+	@Test
+	public void testsql() throws IllegalAccessException,
+			IllegalArgumentException, InvocationTargetException,
+			NoSuchMethodException, SecurityException, ClassNotFoundException {
+		TracingBootstrap
+				.main(new String[] { "test.skywalking.httpClient.v4x.plugin.dubbox.rest.attachment.TestHttpClientV43" });
+	}
+
+	public static void main(String[] args) throws ClassNotFoundException,
+			SQLException, InterruptedException {
+		HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
+		// HttpClient
+		CloseableHttpClient closeableHttpClient = httpClientBuilder.build();
+
+		HttpGet httpGet = new HttpGet("http://www.baidu.com");
+		System.out.println(httpGet.getRequestLine());
+		try {
+			// 执行get请求
+			HttpResponse httpResponse = closeableHttpClient.execute(httpGet);
+			// 获取响应消息实体
+			HttpEntity entity = httpResponse.getEntity();
+			// 响应状态
+			System.out.println("status:" + httpResponse.getStatusLine());
+			// 判断响应实体是否为空
+			if (entity != null) {
+				System.out.println("contentEncoding:"
+						+ entity.getContentEncoding());
+				System.out.println("response content:"
+						+ EntityUtils.toString(entity));
+			}
+		} catch (IOException e) {
+			e.printStackTrace();
+		} finally {
+			try { // 关闭流并释放资源
+				closeableHttpClient.close();
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+		
+		Thread.sleep(5*1000);
+	}
+}

skywalking-sdk-plugin/skywalking-httpClient-4.x-plugin-dubbox-rest-attachment/src/test/resources/log4j2.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="error">
+	<Appenders>
+		<Console name="Console" target="SYSTEM_OUT">
+			<PatternLayout pattern="%d [%t](%F:%L) %-5level %logger{36} - %msg%n" />
+		</Console>
+		<Console name="Console2" target="SYSTEM_OUT">
+			<PatternLayout pattern="%d [%t](%F:%L) %-5level %logger{36} - %msg%n" />
+		</Console>
+	</Appenders>
+	<Loggers>
+		<Root level="debug">
+			<AppenderRef ref="Console" />
+		</Root>
+	</Loggers>
+</Configuration>
\ No newline at end of file

skywalking-sdk-plugin/skywalking-httpClient-4.x-plugin-dubbox-rest-attachment/src/test/resources/sky-walking.auth

+#skyWalking用户ID
+skywalking.user_id=123
+#skyWalking应用编码
+skywalking.application_code=test
+#skywalking auth的环境变量名字
+skywalking.auth_system_env_name=SKYWALKING_RUN
+#skywalking数据编码
+skywalking.charset=UTF-8
+
+#是否打印数据
+buriedpoint.printf=true
+#埋点异常的最大长度
+buriedpoint.max_exception_stack_length=4000
+#业务字段的最大长度
+buriedpoint.businesskey_max_length=300
+#过滤异常
+buriedpoint.exclusive_exceptions=java.lang.RuntimeException
+
+#最大发送者的连接数阀比例
+sender.connect_percent=100
+#发送服务端配置
+sender.servers_addr=127.0.0.1:34000
+#最大发送的副本数量
+sender.max_copy_num=2
+#发送的最大长度
+sender.max_send_length=20000
+#当没有Sender时,尝试获取sender的等待周期
+sender.retry_get_sender_wait_interval=2000
+#是否开启发送消息
+sender.is_off=false
+
+
+#最大消费线程数
+consumer.max_consumer=2
+#消费者最大等待时间
+consumer.max_wait_time=5
+#发送失败等待时间  
+consumer.consumer_fail_retry_wait_interval=50
+
+#每个Buffer的最大个数
+buffer.buffer_max_size=18000
+#Buffer池的最大长度
+buffer.pool_size=5
+
+#发送检查线程检查周期 
+senderchecker.check_polling_time=200
+