dubbo起停之服务暴露
由上一节可知带上dubbo@Service注解的对象，在注册成为bean之后会进一步注册一个ServiceBean，服务暴露便是在这里
public void afterPropertiesSet() throws Exception {
if (getProvider() == null) {
Map<String, ProviderConfig> providerConfigMap = applicationContext == null ? null : BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, ProviderConfig.class, false, false);
if (providerConfigMap != null && providerConfigMap.size() > 0) {
Map<String, ProtocolConfig> protocolConfigMap = applicationContext == null ? null : BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, ProtocolConfig.class, false, false);
if ((protocolConfigMap == null || protocolConfigMap.size() == 0)
&& providerConfigMap.size() > 1) { // backward compatibility
List<ProviderConfig> providerConfigs = new ArrayList<ProviderConfig>();
for (ProviderConfig config : providerConfigMap.values()) {
if (config.isDefault() != null && config.isDefault().booleanValue()) {
providerConfigs.add(config);
}
}
if (!providerConfigs.isEmpty()) {
setProviders(providerConfigs);
}
} else {
ProviderConfig providerConfig = null;
for (ProviderConfig config : providerConfigMap.values()) {
if (config.isDefault() == null || config.isDefault().booleanValue()) {
if (providerConfig != null) {
throw new IllegalStateException("Duplicate provider configs: " + providerConfig + " and " + config);
}
providerConfig = config;
}
}
if (providerConfig != null) {
setProvider(providerConfig);
}
}
}
}
......
if (getPath() == null || getPath().length() == 0) {
if (beanName != null && beanName.length() > 0
&& getInterface() != null && getInterface().length() > 0
&& beanName.startsWith(getInterface())) {
setPath(beanName);
}
}
if (!isDelay()) {
export();
}
}
protected synchronized void doExport() {
if (unexported) {
throw new IllegalStateException("Already unexported!");
}
if (exported) {
return;
}
exported = true;
if (interfaceName == null || interfaceName.length() == 0) {
throw new IllegalStateException("<dubbo:service interface=\"\" /> interface not allow null!");
}
......
checkApplication();
checkRegistry();
checkProtocol();
appendProperties(this);
checkStubAndMock(interfaceClass);
if (path == null || path.length() == 0) {
path = interfaceName;
}
doExportUrls();
ProviderModel providerModel = new ProviderModel(getUniqueServiceName(), this, ref);
ApplicationModel.initProviderModel(getUniqueServiceName(), providerModel);
}
doExportUrlsFor1Protocol一进去有相当长的逻辑是在各配置对象里搜罗必要的配置信息，在具体的暴露服务的代码之前我们可以得到这样一个map：
接着是暴露服务的逻辑
注意这里有个扩展点，大致的过程是根据url取到物理ip和端口 并从url中根据scope判断是本地的服务还是远程，这里先不关心本地服务的暴露 看下非本地的情况：
在为url和registryURL填充若干属性之后，url便填充registryURL的export属性，registryURL作为参数通过代理工厂实例化一个invoker对象。在之后invoker和serviceBean一起作为参数，暴露服务
仔细看一下
Invoker<?> invoker = proxyFactory.getInvoker(ref, (Class) interfaceClass, registryURL.addParameterAndEncoded(Constants.EXPORT_KEY, url.toFullString()));
调试时的参数，各入参值如下：
proxy指向EchoServiceImpl的实例，type为接口Class类，url为
registry://localhost:2181/com.alibaba.dubbo.registry.RegistryService?application=echo-annotation-provider&dubbo=2.0.2&export=dubbo://10.1.81.210:20880/facade.EchoService?anyhost=true&application=echo-annotation-provider&bean.name=ServiceBean:facade.EchoService&bind.ip=10.1.81.210&bind.port=20880&dubbo=2.0.2&generic=false&interface=facade.EchoService&methods=echo&pid=84968&side=provider×tamp=1572767833008&pid=84968®istry=zookeeper×tamp=1572767833000
深入getWrapper（）：
public static Wrapper getWrapper(Class<?> c) {
while (ClassGenerator.isDynamicClass(c)) // can not wrapper on dynamic class.
c = c.getSuperclass();
if (c == Object.class)
return OBJECT_WRAPPER;
Wrapper ret = WRAPPER_MAP.get(c);
if (ret == null) {
ret = makeWrapper(c);
WRAPPER_MAP.put(c, ret);
}
return ret;
}
Wrapper为每个Class维护了一个WRAPPER_MAP缓存，如果没有命中则初始化makeWrapper(c)：
private static Wrapper makeWrapper(Class<?> c) {
if (c.isPrimitive())
throw new IllegalArgumentException("Can not create wrapper for primitive type: " + c);
String name = c.getName();
ClassLoader cl = ClassHelper.getClassLoader(c);
StringBuilder c1 = new StringBuilder("public void setPropertyValue(Object o, String n, Object v){ ");
StringBuilder c2 = new StringBuilder("public Object getPropertyValue(Object o, String n){ ");
StringBuilder c3 = new StringBuilder("public Object invokeMethod(Object o, String n, Class[] p, Object[] v) throws " + InvocationTargetException.class.getName() + "{ ");
c1.append(name).append(" w; try{ w = ((").append(name).append(")$1); }catch(Throwable e){ throw new IllegalArgumentException(e); }");
c2.append(name).append(" w; try{ w = ((").append(name).append(")$1); }catch(Throwable e){ throw new IllegalArgumentException(e); }");
c3.append(name).append(" w; try{ w = ((").append(name).append(")$1); }catch(Throwable e){ throw new IllegalArgumentException(e); }");
Map<String, Class<?>> pts = new HashMap<String, Class<?>>(); // <property name, property types>
Map<String, Method> ms = new LinkedHashMap<String, Method>(); // <method desc, Method instance>
List<String> mns = new ArrayList<String>(); // method names.
List<String> dmns = new ArrayList<String>(); // declaring method names.
// get all public field.
for (Field f : c.getFields()) {
String fn = f.getName();
Class<?> ft = f.getType();
if (Modifier.isStatic(f.getModifiers()) || Modifier.isTransient(f.getModifiers()))
continue;
c1.append(" if( $2.equals(\"").append(fn).append("\") ){ w.").append(fn).append("=").append(arg(ft, "$3")).append("; return; }");
c2.append(" if( $2.equals(\"").append(fn).append("\") ){ return ($w)w.").append(fn).append("; }");
pts.put(fn, ft);
}
Method[] methods = c.getMethods();
// get all public method.
boolean hasMethod = hasMethods(methods);
if (hasMethod) {
c3.append(" try{");
}
for (Method m : methods) {
if (m.getDeclaringClass() == Object.class) //ignore Object's method.
continue;
String mn = m.getName();
c3.append(" if( \"").append(mn).append("\".equals( $2 ) ");
int len = m.getParameterTypes().length;
c3.append(" && ").append(" $3.length == ").append(len);
boolean override = false;
for (Method m2 : methods) {
if (m != m2 && m.getName().equals(m2.getName())) {
override = true;
break;
}
}
if (override) {
if (len > 0) {
for (int l = 0; l < len; l++) {
c3.append(" && ").append(" $3[").append(l).append("].getName().equals(\"")
.append(m.getParameterTypes()[l].getName()).append("\")");
}
}
}
c3.append(" ) { ");
if (m.getReturnType() == Void.TYPE)
c3.append(" w.").append(mn).append('(').append(args(m.getParameterTypes(), "$4")).append(");").append(" return null;");
else
c3.append(" return ($w)w.").append(mn).append('(').append(args(m.getParameterTypes(), "$4")).append(");");
c3.append(" }");
mns.add(mn);
if (m.getDeclaringClass() == c)
dmns.add(mn);
ms.put(ReflectUtils.getDesc(m), m);
}
if (hasMethod) {
c3.append(" } catch(Throwable e) { ");
c3.append(" throw new java.lang.reflect.InvocationTargetException(e); ");
c3.append(" }");
}
c3.append(" throw new " + NoSuchMethodException.class.getName() + "(\"Not found method \\\"\"+$2+\"\\\" in class " + c.getName() + ".\"); }");
// deal with get/set method.
Matcher matcher;
for (Map.Entry<String, Method> entry : ms.entrySet()) {
String md = entry.getKey();
Method method = (Method) entry.getValue();
if ((matcher = ReflectUtils.GETTER_METHOD_DESC_PATTERN.matcher(md)).matches()) {
String pn = propertyName(matcher.group(1));
c2.append(" if( $2.equals(\"").append(pn).append("\") ){ return ($w)w.").append(method.getName()).append("(); }");
pts.put(pn, method.getReturnType());
} else if ((matcher = ReflectUtils.IS_HAS_CAN_METHOD_DESC_PATTERN.matcher(md)).matches()) {
String pn = propertyName(matcher.group(1));
c2.append(" if( $2.equals(\"").append(pn).append("\") ){ return ($w)w.").append(method.getName()).append("(); }");
pts.put(pn, method.getReturnType());
} else if ((matcher = ReflectUtils.SETTER_METHOD_DESC_PATTERN.matcher(md)).matches()) {
Class<?> pt = method.getParameterTypes()[0];
String pn = propertyName(matcher.group(1));
c1.append(" if( $2.equals(\"").append(pn).append("\") ){ w.").append(method.getName()).append("(").append(arg(pt, "$3")).append("); return; }");
pts.put(pn, pt);
}
}
c1.append(" throw new " + NoSuchPropertyException.class.getName() + "(\"Not found property \\\"\"+$2+\"\\\" filed or setter method in class " + c.getName() + ".\"); }");
c2.append(" throw new " + NoSuchPropertyException.class.getName() + "(\"Not found property \\\"\"+$2+\"\\\" filed or setter method in class " + c.getName() + ".\"); }");
// make class
long id = WRAPPER_CLASS_COUNTER.getAndIncrement();
ClassGenerator cc = ClassGenerator.newInstance(cl);
cc.setClassName((Modifier.isPublic(c.getModifiers()) ? Wrapper.class.getName() : c.getName() + "$sw") + id);
cc.setSuperClass(Wrapper.class);
cc.addDefaultConstructor();
cc.addField("public static String[] pns;"); // property name array.
cc.addField("public static " + Map.class.getName() + " pts;"); // property type map.
cc.addField("public static String[] mns;"); // all method name array.
cc.addField("public static String[] dmns;"); // declared method name array.
for (int i = 0, len = ms.size(); i < len; i++)
cc.addField("public static Class[] mts" + i + ";");
cc.addMethod("public String[] getPropertyNames(){ return pns; }");
cc.addMethod("public boolean hasProperty(String n){ return pts.containsKey($1); }");
cc.addMethod("public Class getPropertyType(String n){ return (Class)pts.get($1); }");
cc.addMethod("public String[] getMethodNames(){ return mns; }");
cc.addMethod("public String[] getDeclaredMethodNames(){ return dmns; }");
cc.addMethod(c1.toString());
cc.addMethod(c2.toString());
cc.addMethod(c3.toString());
try {
Class<?> wc = cc.toClass();
// setup static field.
wc.getField("pts").set(null, pts);
wc.getField("pns").set(null, pts.keySet().toArray(new String[0]));
wc.getField("mns").set(null, mns.toArray(new String[0]));
wc.getField("dmns").set(null, dmns.toArray(new String[0]));
int ix = 0;
for (Method m : ms.values())
wc.getField("mts" + ix++).set(null, m.getParameterTypes());
return (Wrapper) wc.newInstance();
} catch (RuntimeException e) {
throw e;
} catch (Throwable e) {
throw new RuntimeException(e.getMessage(), e);
} finally {
cc.release();
ms.clear();
mns.clear();
dmns.clear();
}
}
我们修改源码试图将javasisst生成的代码导出：
mCtc.writeFile("/Users/lichengcheng/dubbo");
重新打包，可以看到生成的代理class如下：
package com.alibaba.dubbo.common.bytecode; import facade.EchoService;
import java.lang.reflect.InvocationTargetException;
import java.util.Map; public class Wrapper0
extends Wrapper
implements ClassGenerator.DC
{
public static String[] pns;
public static Map pts;
public static String[] mns;
public static String[] dmns;
public static Class[] mts0; public String[] getPropertyNames()
{
return pns;
} public boolean hasProperty(String paramString)
{
return pts.containsKey(paramString);
} public Class getPropertyType(String paramString)
{
return (Class)pts.get(paramString);
} public String[] getMethodNames()
{
return mns;
} public String[] getDeclaredMethodNames()
{
return dmns;
} public void setPropertyValue(Object paramObject1, String paramString, Object paramObject2)
{
try
{
EchoService localEchoService = (EchoService)paramObject1;
}
catch (Throwable localThrowable)
{
throw new IllegalArgumentException(localThrowable);
}
throw new NoSuchPropertyException("Not found property \"" + paramString + "\" filed or setter method in class facade.EchoService.");
} public Object getPropertyValue(Object paramObject, String paramString)
{
try
{
EchoService localEchoService = (EchoService)paramObject;
}
catch (Throwable localThrowable)
{
throw new IllegalArgumentException(localThrowable);
}
throw new NoSuchPropertyException("Not found property \"" + paramString + "\" filed or setter method in class facade.EchoService.");
} public Object invokeMethod(Object paramObject, String paramString, Class[] paramArrayOfClass, Object[] paramArrayOfObject)
throws InvocationTargetException
{
EchoService localEchoService;
try
{
localEchoService = (EchoService)paramObject;
}
catch (Throwable localThrowable1)
{
throw new IllegalArgumentException(localThrowable1);
}
try
{
if ((!"echo".equals(paramString)) || (paramArrayOfClass.length == 1)) {
return localEchoService.echo((String)paramArrayOfObject[0]);
}
}
catch (Throwable localThrowable2)
{
throw new InvocationTargetException(localThrowable2);
}
throw new NoSuchMethodException("Not found method \"" + paramString + "\" in class facade.EchoService.");
}
}
这里开始是一连串的拦截器，最后会到DubboProtocol#export暴露服务：
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