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| e7c126 | 1 | /* |
| H | 2 | * Copyright 2002-2021 the original author or authors. |
| 3 | * | |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 | * you may not use this file except in compliance with the License. | |
| 6 | * You may obtain a copy of the License at | |
| 7 | * | |
| 8 | * https://www.apache.org/licenses/LICENSE-2.0 | |
| 9 | * | |
| 10 | * Unless required by applicable law or agreed to in writing, software | |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 | * See the License for the specific language governing permissions and | |
| 14 | * limitations under the License. | |
| 15 | */ | |
| 16 | ||
| 17 | package org.springframework.messaging.handler.invocation; | |
| 18 | ||
| 19 | import com.iailab.framework.tenant.core.context.TenantContextHolder; | |
| 20 | import com.iailab.framework.tenant.core.util.TenantUtils; | |
| 21 | import org.springframework.core.DefaultParameterNameDiscoverer; | |
| 22 | import org.springframework.core.MethodParameter; | |
| 23 | import org.springframework.core.ParameterNameDiscoverer; | |
| 24 | import org.springframework.core.ResolvableType; | |
| 25 | import org.springframework.lang.Nullable; | |
| 26 | import org.springframework.messaging.Message; | |
| 27 | import org.springframework.messaging.handler.HandlerMethod; | |
| 28 | import org.springframework.util.ObjectUtils; | |
| 29 | ||
| 30 | import java.lang.reflect.InvocationTargetException; | |
| 31 | import java.lang.reflect.Method; | |
| 32 | import java.lang.reflect.Type; | |
| 33 | import java.util.Arrays; | |
| 34 | ||
| 35 | import static com.iailab.framework.web.core.util.WebFrameworkUtils.HEADER_TENANT_ID; | |
| 36 | ||
| 37 | /** | |
| 38 | * Extension of {@link HandlerMethod} that invokes the underlying method with | |
| 39 | * argument values resolved from the current HTTP request through a list of | |
| 40 | * {@link HandlerMethodArgumentResolver}. | |
| 41 | * | |
| 42 | * 针对 rabbitmq-spring 和 kafka-spring，不存在合适的拓展点，可以实现 Consumer 消费前，读取 Header 中的 tenant-id 设置到 {@link TenantContextHolder} 中 | |
| 43 | * TODO iailab：持续跟进，看看有没新的拓展点 | |
| 44 | * | |
| 45 | * @author Rossen Stoyanchev | |
| 46 | * @author Juergen Hoeller | |
| 47 | * @since 4.0 | |
| 48 | */ | |
| 49 | public class InvocableHandlerMethod extends HandlerMethod { | |
| 50 | ||
| 51 | private static final Object[] EMPTY_ARGS = new Object[0]; | |
| 52 | ||
| 53 | private HandlerMethodArgumentResolverComposite resolvers = new HandlerMethodArgumentResolverComposite(); | |
| 54 | ||
| 55 | private ParameterNameDiscoverer parameterNameDiscoverer = new DefaultParameterNameDiscoverer(); | |
| 56 | ||
| 57 | /** | |
| 58 | * Create an instance from a {@code HandlerMethod}. | |
| 59 | */ | |
| 60 | public InvocableHandlerMethod(HandlerMethod handlerMethod) { | |
| 61 | super(handlerMethod); | |
| 62 | } | |
| 63 | ||
| 64 | /** | |
| 65 | * Create an instance from a bean instance and a method. | |
| 66 | */ | |
| 67 | public InvocableHandlerMethod(Object bean, Method method) { | |
| 68 | super(bean, method); | |
| 69 | } | |
| 70 | ||
| 71 | /** | |
| 72 | * Construct a new handler method with the given bean instance, method name and parameters. | |
| 73 | * @param bean the object bean | |
| 74 | * @param methodName the method name | |
| 75 | * @param parameterTypes the method parameter types | |
| 76 | * @throws NoSuchMethodException when the method cannot be found | |
| 77 | */ | |
| 78 | public InvocableHandlerMethod(Object bean, String methodName, Class<?>... parameterTypes) | |
| 79 | throws NoSuchMethodException { | |
| 80 | ||
| 81 | super(bean, methodName, parameterTypes); | |
| 82 | } | |
| 83 | ||
| 84 | /** | |
| 85 | * Set {@link HandlerMethodArgumentResolver HandlerMethodArgumentResolvers} to use for resolving method argument values. | |
| 86 | */ | |
| 87 | public void setMessageMethodArgumentResolvers(HandlerMethodArgumentResolverComposite argumentResolvers) { | |
| 88 | this.resolvers = argumentResolvers; | |
| 89 | } | |
| 90 | ||
| 91 | /** | |
| 92 | * Set the ParameterNameDiscoverer for resolving parameter names when needed | |
| 93 | * (e.g. default request attribute name). | |
| 94 | * <p>Default is a {@link DefaultParameterNameDiscoverer}. | |
| 95 | */ | |
| 96 | public void setParameterNameDiscoverer(ParameterNameDiscoverer parameterNameDiscoverer) { | |
| 97 | this.parameterNameDiscoverer = parameterNameDiscoverer; | |
| 98 | } | |
| 99 | ||
| 100 | /** | |
| 101 | * Invoke the method after resolving its argument values in the context of the given message. | |
| 102 | * <p>Argument values are commonly resolved through | |
| 103 | * {@link HandlerMethodArgumentResolver HandlerMethodArgumentResolvers}. | |
| 104 | * The {@code providedArgs} parameter however may supply argument values to be used directly, | |
| 105 | * i.e. without argument resolution. | |
| 106 | * <p>Delegates to {@link #getMethodArgumentValues} and calls {@link #doInvoke} with the | |
| 107 | * resolved arguments. | |
| 108 | * @param message the current message being processed | |
| 109 | * @param providedArgs "given" arguments matched by type, not resolved | |
| 110 | * @return the raw value returned by the invoked method | |
| 111 | * @throws Exception raised if no suitable argument resolver can be found, | |
| 112 | * or if the method raised an exception | |
| 113 | * @see #getMethodArgumentValues | |
| 114 | * @see #doInvoke | |
| 115 | */ | |
| 116 | @Nullable | |
| 117 | public Object invoke(Message<?> message, Object... providedArgs) throws Exception { | |
| 118 | Object[] args = getMethodArgumentValues(message, providedArgs); | |
| 119 | if (logger.isTraceEnabled()) { | |
| 120 | logger.trace("Arguments: " + Arrays.toString(args)); | |
| 121 | } | |
| 122 | // 注意：如下是本类的改动点！！！ | |
| 123 | // 情况一：无租户编号的情况 | |
| 124 | Long tenantId= parseTenantId(message); | |
| 125 | if (tenantId == null) { | |
| 126 | return doInvoke(args); | |
| 127 | } | |
| 128 | // 情况二：有租户的情况下 | |
| 129 | return TenantUtils.execute(tenantId, () -> doInvoke(args)); | |
| 130 | } | |
| 131 | ||
| 132 | private Long parseTenantId(Message<?> message) { | |
| 133 | Object tenantId = message.getHeaders().get(HEADER_TENANT_ID); | |
| 134 | if (tenantId == null) { | |
| 135 | return null; | |
| 136 | } | |
| 137 | if (tenantId instanceof Long) { | |
| 138 | return (Long) tenantId; | |
| 139 | } | |
| 140 | if (tenantId instanceof Number) { | |
| 141 | return ((Number) tenantId).longValue(); | |
| 142 | } | |
| 143 | if (tenantId instanceof String) { | |
| 144 | return Long.parseLong((String) tenantId); | |
| 145 | } | |
| 146 | if (tenantId instanceof byte[]) { | |
| 147 | return Long.parseLong(new String((byte[]) tenantId)); | |
| 148 | } | |
| 149 | throw new IllegalArgumentException("未知的数据类型：" + tenantId); | |
| 150 | } | |
| 151 | ||
| 152 | /** | |
| 153 | * Get the method argument values for the current message, checking the provided | |
| 154 | * argument values and falling back to the configured argument resolvers. | |
| 155 | * <p>The resulting array will be passed into {@link #doInvoke}. | |
| 156 | * @since 5.1.2 | |
| 157 | */ | |
| 158 | protected Object[] getMethodArgumentValues(Message<?> message, Object... providedArgs) throws Exception { | |
| 159 | MethodParameter[] parameters = getMethodParameters(); | |
| 160 | if (ObjectUtils.isEmpty(parameters)) { | |
| 161 | return EMPTY_ARGS; | |
| 162 | } | |
| 163 | ||
| 164 | Object[] args = new Object[parameters.length]; | |
| 165 | for (int i = 0; i < parameters.length; i++) { | |
| 166 | MethodParameter parameter = parameters[i]; | |
| 167 | parameter.initParameterNameDiscovery(this.parameterNameDiscoverer); | |
| 168 | args[i] = findProvidedArgument(parameter, providedArgs); | |
| 169 | if (args[i] != null) { | |
| 170 | continue; | |
| 171 | } | |
| 172 | if (!this.resolvers.supportsParameter(parameter)) { | |
| 173 | throw new MethodArgumentResolutionException( | |
| 174 | message, parameter, formatArgumentError(parameter, "No suitable resolver")); | |
| 175 | } | |
| 176 | try { | |
| 177 | args[i] = this.resolvers.resolveArgument(parameter, message); | |
| 178 | } | |
| 179 | catch (Exception ex) { | |
| 180 | // Leave stack trace for later, exception may actually be resolved and handled... | |
| 181 | if (logger.isDebugEnabled()) { | |
| 182 | String exMsg = ex.getMessage(); | |
| 183 | if (exMsg != null && !exMsg.contains(parameter.getExecutable().toGenericString())) { | |
| 184 | logger.debug(formatArgumentError(parameter, exMsg)); | |
| 185 | } | |
| 186 | } | |
| 187 | throw ex; | |
| 188 | } | |
| 189 | } | |
| 190 | return args; | |
| 191 | } | |
| 192 | ||
| 193 | /** | |
| 194 | * Invoke the handler method with the given argument values. | |
| 195 | */ | |
| 196 | @Nullable | |
| 197 | protected Object doInvoke(Object... args) throws Exception { | |
| 198 | try { | |
| 199 | return getBridgedMethod().invoke(getBean(), args); | |
| 200 | } | |
| 201 | catch (IllegalArgumentException ex) { | |
| 202 | assertTargetBean(getBridgedMethod(), getBean(), args); | |
| 203 | String text = (ex.getMessage() != null ? ex.getMessage() : "Illegal argument"); | |
| 204 | throw new IllegalStateException(formatInvokeError(text, args), ex); | |
| 205 | } | |
| 206 | catch (InvocationTargetException ex) { | |
| 207 | // Unwrap for HandlerExceptionResolvers ... | |
| 208 | Throwable targetException = ex.getTargetException(); | |
| 209 | if (targetException instanceof RuntimeException) { | |
| 210 | throw (RuntimeException) targetException; | |
| 211 | } | |
| 212 | else if (targetException instanceof Error) { | |
| 213 | throw (Error) targetException; | |
| 214 | } | |
| 215 | else if (targetException instanceof Exception) { | |
| 216 | throw (Exception) targetException; | |
| 217 | } | |
| 218 | else { | |
| 219 | throw new IllegalStateException(formatInvokeError("Invocation failure", args), targetException); | |
| 220 | } | |
| 221 | } | |
| 222 | } | |
| 223 | ||
| 224 | MethodParameter getAsyncReturnValueType(@Nullable Object returnValue) { | |
| 225 | return new AsyncResultMethodParameter(returnValue); | |
| 226 | } | |
| 227 | ||
| 228 | private class AsyncResultMethodParameter extends HandlerMethodParameter { | |
| 229 | ||
| 230 | @Nullable | |
| 231 | private final Object returnValue; | |
| 232 | ||
| 233 | private final ResolvableType returnType; | |
| 234 | ||
| 235 | public AsyncResultMethodParameter(@Nullable Object returnValue) { | |
| 236 | super(-1); | |
| 237 | this.returnValue = returnValue; | |
| 238 | this.returnType = ResolvableType.forType(super.getGenericParameterType()).getGeneric(); | |
| 239 | } | |
| 240 | ||
| 241 | protected AsyncResultMethodParameter(AsyncResultMethodParameter original) { | |
| 242 | super(original); | |
| 243 | this.returnValue = original.returnValue; | |
| 244 | this.returnType = original.returnType; | |
| 245 | } | |
| 246 | ||
| 247 | @Override | |
| 248 | public Class<?> getParameterType() { | |
| 249 | if (this.returnValue != null) { | |
| 250 | return this.returnValue.getClass(); | |
| 251 | } | |
| 252 | if (!ResolvableType.NONE.equals(this.returnType)) { | |
| 253 | return this.returnType.toClass(); | |
| 254 | } | |
| 255 | return super.getParameterType(); | |
| 256 | } | |
| 257 | ||
| 258 | @Override | |
| 259 | public Type getGenericParameterType() { | |
| 260 | return this.returnType.getType(); | |
| 261 | } | |
| 262 | ||
| 263 | @Override | |
| 264 | public AsyncResultMethodParameter clone() { | |
| 265 | return new AsyncResultMethodParameter(this); | |
| 266 | } | |
| 267 | } | |
| 268 | ||
| 269 | } | |
