Add an example for hot reloading

example/hot/main.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"time"
+
+	"github.com/unitoftime/flow/example/hot/plugin"
+	"github.com/unitoftime/flow/hot"
+)
+
+// Steps:
+// 1. run rebuild.sh to build the initial plugin *.so file
+// 2. Run main.go
+// 3. Change something in the HelloWorld function in ./plugin/plugin.go
+// 4. run rebuild.sh to rebuild the plugin *.so file. the main() function below will detect, reload the symbol and run it once
+
+// Note: You need to run rebuild.sh to build the plugin *.so file
+
+func main() {
+	// You can directly import the plugin package to use it immediately
+	plugin.HelloWorld()
+
+	// This will search the provided directory for .so files and try to load them
+	p := hot.NewPlugin("./plugin/build/lib/")
+
+	for {
+		time.Sleep(1 * time.Second)
+		if !p.Check() { continue } // When this becomes true, it means a new plugin is loaded
+
+		// With our new plugin, we can lookup our symbol `HelloWorld`
+		sym, err := p.Lookup("HelloWorld")
+		if err != nil {
+			panic(err)
+		}
+		hello := sym.(func())
+
+		// Then we can call our Looked up symbol
+		hello()
+	}
+}

example/hot/plugin/plugin.go

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+package plugin
+
+import (
+	"fmt"
+)
+
+// Note: Here you can change one function to the other while main.go is running.
+
+func HelloWorld() {
+	fmt.Println("Hello World")
+}
+
+
+// func HelloWorld() {
+// 	fmt.Println("Goodbye Moon")
+// }

example/hot/rebuild.sh

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+#!/bin/bash
+
+set -e
+
+PLUGIN_DIR=./plugin/
+BUILD_DIR=./plugin/build/
+BUILD_PKG_DIR=${BUILD_DIR}/pkg/
+BUILD_LIB_DIR=${BUILD_DIR}/lib/
+
+mkdir -p ${BUILD_PKG_DIR}
+mkdir -p ${BUILD_LIB_DIR}
+
+rm -f ${BUILD_LIB_DIR}/*.so
+
+VAR=$RANDOM
+
+# Note: I usually leave this uncommented, but I didnt want to accidentally wipe someones computer
+#rm -rf ${BUILD_PKG_DIR}/*
+mkdir -p ${BUILD_PKG_DIR}/tmp$VAR
+
+cp ${PLUGIN_DIR}/*.go ${BUILD_PKG_DIR}/tmp$VAR
+
+cd ${BUILD_PKG_DIR}/tmp$VAR
+sed -i 's/package plugin/package main/g' *.go
+cd -
+
+go build -gcflags=all=-d=checkptr=0 -buildmode=plugin -o ${BUILD_LIB_DIR}/tmp$VAR.so ${BUILD_PKG_DIR}/tmp$VAR
+
+echo "Finished Rebuild" $VAR
+tree