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com.github.bingoohuang.springrestclient.generators.SpringRestClientFactory Maven / Gradle / Ivy
package com.github.bingoohuang.springrestclient.generators;
import com.github.bingoohuang.springrestclient.annotations.*;
import com.github.bingoohuang.springrestclient.provider.BaseUrlProvider;
import com.github.bingoohuang.springrestclient.provider.FixedBaseUrlProvider;
import com.github.bingoohuang.springrestclient.provider.SignProvider;
import com.github.bingoohuang.springrestclient.utils.Obj;
import com.google.common.base.Strings;
import com.google.common.base.Throwables;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.collect.Maps;
import com.google.common.util.concurrent.UncheckedExecutionException;
import org.apache.commons.lang3.StringUtils;
import org.springframework.context.ApplicationContext;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
public class SpringRestClientFactory {
private static Cache restClientCache = CacheBuilder.newBuilder().build();
public static T getRestClient(final Class restClientClass, final ApplicationContext appContext) {
Obj.ensureInterface(restClientClass);
try {
return (T) restClientCache.get(restClientClass, new Callable() {
@Override
public Object call() throws Exception {
return load(restClientClass, appContext);
}
});
} catch (ExecutionException e) {
Throwable cause = e.getCause();
throw Throwables.propagate(cause);
} catch (UncheckedExecutionException e) {
Throwable cause = e.getCause();
throw Throwables.propagate(cause);
}
}
public static Object load(Class restClientClass, ApplicationContext appContext) throws Exception {
ClassGenerator generator = new ClassGenerator(restClientClass);
Class restClientImplClass = generator.generate();
Object object = Obj.createObject(restClientImplClass);
setSignProvider(restClientImplClass, object, restClientClass, appContext);
setBaseUrlProvider(restClientImplClass, object, restClientClass, appContext);
setStatusMappings(restClientImplClass, object, restClientClass);
setFixedRequestParams(restClientImplClass, object, restClientClass);
setSuccInResponseJSONProperty(restClientImplClass, object, restClientClass);
setAppContext(restClientImplClass, object, restClientClass, appContext);
return object;
}
private static void setAppContext(Class restClientImplClass, Object object,
Class restClientClass, ApplicationContext appContext) {
Obj.setField(restClientImplClass, object, MethodGenerator.appContext, appContext);
}
private static void setSuccInResponseJSONProperty(
Class restClientImplClass, Object object, Class restClientClass) {
for (Method method : restClientClass.getDeclaredMethods()) {
SuccInResponseJSONProperty property = method.getAnnotation(SuccInResponseJSONProperty.class);
if (property == null) property = restClientClass.getAnnotation(SuccInResponseJSONProperty.class);
String fieldName = method.getName() + MethodGenerator.SuccInResponseJSONProperty;
Obj.setField(restClientImplClass, object, fieldName, property);
}
}
private static void setFixedRequestParams(Class restClientImplClass, Object object, Class restClientClass) {
for (Method method : restClientClass.getDeclaredMethods()) {
Map mappings = createFixedRequestParams(method, restClientClass);
String fieldName = method.getName() + MethodGenerator.FixedRequestParams;
Obj.setField(restClientImplClass, object, fieldName, mappings);
}
}
private static Map createFixedRequestParams(Method method, Class restClientClass) {
Map map = Maps.newHashMap();
putRequestParams(map, restClientClass);
putRequestParams(map, method);
return Collections.unmodifiableMap(map);
}
private static void putRequestParams(Map map, AnnotatedElement accessibleObject) {
// 按声明顺序来添加固定请求参数
for (Annotation annotation : accessibleObject.getAnnotations()) {
if (annotation instanceof FixedRequestParam) {
putFixedRequestParam(map, (FixedRequestParam) annotation);
} else if (annotation instanceof FixedRequestParams) {
for (FixedRequestParam paramValue : ((FixedRequestParams) annotation).value()) {
putFixedRequestParam(map, paramValue);
}
}
}
}
private static void putFixedRequestParam(Map map, FixedRequestParam fixedRequestParam) {
if (fixedRequestParam.clazz() != void.class) {
map.put(fixedRequestParam.name(), fixedRequestParam.clazz());
} else if (StringUtils.isNotEmpty(fixedRequestParam.value())) {
map.put(fixedRequestParam.name(), fixedRequestParam.value());
} else {
throw new RuntimeException("bad config for @FixedRequestParam" + fixedRequestParam
+ " value or clazz should be assigned");
}
}
private static void setStatusMappings(Class restClientImplClass, Object object, Class restClientClass) {
for (Method method : restClientClass.getDeclaredMethods()) {
Map> mappings = createStatusExceptionMappings(method, restClientClass);
String fieldName = method.getName() + MethodGenerator.StatusExceptionMappings;
Obj.setField(restClientImplClass, object, fieldName, mappings);
}
}
private static Map> createStatusExceptionMappings(
Method method, Class restClientClass) {
Map> statusExceptionMappings = Maps.newHashMap();
addStatusExceptionMapppings(method, statusExceptionMappings, restClientClass.getAnnotation(RespStatusMappings.class));
addStatusExceptionMapppings(method, statusExceptionMappings, method.getAnnotation(RespStatusMappings.class));
return Collections.unmodifiableMap(statusExceptionMappings);
}
private static void addStatusExceptionMapppings(
Method method, Map> statusExceptionMappings,
RespStatusMappings respStatusMappings) {
if (respStatusMappings == null) return;
for (RespStatusMapping respStatusMapping : respStatusMappings.value()) {
Class exceptionClass = respStatusMapping.exception();
checkMethodException(method, exceptionClass);
statusExceptionMappings.put(respStatusMapping.status(), exceptionClass);
}
}
private static void checkMethodException(Method method,
Class exceptionClass) {
if (RuntimeException.class.isAssignableFrom(exceptionClass)) return;
// checked exception should be declared
for (Class declaredExceptionType : method.getExceptionTypes()) {
if (declaredExceptionType == exceptionClass) return;
}
throw new RuntimeException(exceptionClass
+ " is checked exception and should be declared on the method " + method);
}
private static void setBaseUrlProvider(Class restClientImplClass, Object object, Class restClientClass, ApplicationContext appContext) {
BaseUrlProvider provider = createBaseUrlProvider(restClientClass, appContext);
Obj.setField(restClientImplClass, object, MethodGenerator.baseUrlProvider, provider);
}
private static void setSignProvider(Class restClientImplClass, Object object, Class restClientClass, ApplicationContext appContext) {
SignProvider provider = createSignProvider(restClientClass, appContext);
Obj.setField(restClientImplClass, object, MethodGenerator.signProvider, provider);
}
private static SignProvider createSignProvider(Class restClientClass, ApplicationContext appContext) {
SpringRestClientEnabled restClientEnabled = restClientClass.getAnnotation(SpringRestClientEnabled.class);
Class signProviderClass = restClientEnabled.signProvider();
SignProvider bean = Obj.getBean(appContext, signProviderClass);
if (bean != null) return bean;
if (signProviderClass.isInterface()) return null;
try {
return signProviderClass.newInstance();
} catch (Exception e) {
throw new RuntimeException("signProvider configuration error for api " + restClientClass, e);
}
}
private static BaseUrlProvider createBaseUrlProvider(Class restClientClass, ApplicationContext appContext) {
SpringRestClientEnabled restClientEnabled = restClientClass.getAnnotation(SpringRestClientEnabled.class);
String baseUrl = restClientEnabled.baseUrl();
if (!Strings.isNullOrEmpty(baseUrl)) return new FixedBaseUrlProvider(baseUrl);
Class providerClass = restClientEnabled.baseUrlProvider();
BaseUrlProvider bean = Obj.getBean(appContext, providerClass);
if (bean != null) return bean;
if (providerClass.isInterface()) {
throw new RuntimeException("base url should be configured for api " + restClientClass);
}
return Obj.createObject(providerClass, restClientClass);
}
}
