上下文 本文介绍在函数计算中Context的相关概念和使用示例。 上下文 当函数计算运行您的函数时,会将上下文(Context)对象传递到执行方法中。该对象包含有关调用、服务、函数和执行环境等信息。Context接口定义如下: package com.ctg.faas.runtime; / The context object allows you to access useful information available within the Tianyi cloud function compute execution environment / public interface Context { / Gets the function request ID associated with the request. This is the same ID returned to the client that called invoke(). This ID is reused for retries on the same request. @return The request id / public String getRequestId(); / Gets the credentials of the execution role @return The request Credentials / public Credentials getExecutionCredentials(); / Gets the function related parameters @return The request function params / public FunctionParam getFunctionParam(); / Gets the service related parameters @return The request service info / public Service getService(); / Gets the function compute logger instance associated with the context object @return The fc logger / public FunctionComputeLogger getLogger(); / Gets the function compute opentracing instance associated with the context object @return The fc tracing / public OpenTracing getTracing(); / Gets the function compute retry count associated with the context object @return The retry count / public int getRetryCount(); } 示例:获取函数相关信息 使用Context获取函数Handler和Initializer: package example; import com.ctg.faas.runtime.Context; import com.ctg.faas.runtime.FunctionParam; import com.ctg.faas.runtime.PojoRequestHandler; public class PojoHandler implements PojoRequestHandler { @Override public String handleRequest(String in, Context context) { FunctionParam functionParam context.getFunctionParam(); String initializer functionParam.getFunctionInitializer(); String handler functionParam.getFunctionHandler(); return String.format("Function initializer is: %s, handler is: %s", initializer, handler); } }