feat: add context to Java runtime

Author: alexec

Dockerfile

@@ -49,13 +49,15 @@ ADD runtimes/go1-16 /workspace
 RUN chown -R 9653 /.cache /workspace
 WORKDIR /workspace
 USER 9653:9653
+RUN go build ./...
 ENTRYPOINT ./entrypoint.sh
 
 FROM openjdk:16 AS java16
 ADD runtimes/java16 /workspace
 RUN chown -R 9653 /workspace
 WORKDIR /workspace
 USER 9653:9653
+RUN javac *.java
 ENTRYPOINT ./entrypoint.sh
 
 FROM python:3.9-alpine AS python3-9

dsls/python/__init__.py

@@ -8,7 +8,7 @@
 
 
 def str_presenter(dumper, data):
-    if len(data.splitlines()) > 1 or '"' in data or "'" in data:
+    if '\n' in data or '"' in data or "'" in data:
         return dumper.represent_scalar('tag:yaml.org,2002:str', data, style='|')
     return dumper.represent_scalar('tag:yaml.org,2002:str', data)
 
@@ -433,7 +433,7 @@ def dump(self):
 
 
 class KafkaSource(Source):
-    def __init__(self, topic,  name=None, retryPolicy=None):
+    def __init__(self, topic, name=None, retryPolicy=None):
         super().__init__(name=name, retryPolicy=retryPolicy)
         self._topic = topic
 
@@ -444,7 +444,7 @@ def dump(self):
 
 
 class STANSource(Source):
-    def __init__(self, subject, name=None,  retryPolicy=None):
+    def __init__(self, subject, name=None, retryPolicy=None):
         super().__init__(name=name, retryPolicy=retryPolicy)
         self._subject = subject
 
@@ -463,9 +463,9 @@ def http(name=None, retryPolicy=None):
     return HTTPSource(name=name, retryPolicy=retryPolicy)
 
 
-def kafka(topic,  name=None, retryPolicy=None):
-    return KafkaSource(topic,  name=name, retryPolicy=retryPolicy)
+def kafka(topic, name=None, retryPolicy=None):
+    return KafkaSource(topic, name=name, retryPolicy=retryPolicy)
 
 
-def stan(subject, name=None,  retryPolicy=None):
+def stan(subject, name=None, retryPolicy=None):
     return STANSource(subject, name=name, retryPolicy=retryPolicy)

examples/104-java16-pipeline.py

@@ -13,8 +13,9 @@ def handler(msg):
 [Learn about handlers](../docs/HANDLERS.md)""")
      .step(
         (kafka('input-topic')
-         .handler('main', code="""public class Handler {
-    public static byte[] Handle(byte[] msg) throws Exception {
+         .handler('main', code="""import java.util.Map;
+
+public static byte[] Handle(byte[] msg, Map<String,String> context) throws Exception {
         return msg;
     }
 }""", runtime='java16')

examples/104-java16-pipeline.yaml

@@ -12,8 +12,9 @@ spec:
   steps:
   - handler:
       code: |-
-        public class Handler {
-            public static byte[] Handle(byte[] msg) throws Exception {
+        import java.util.Map;
+
+        public static byte[] Handle(byte[] msg, Map<String,String> context) throws Exception {
                 return msg;
             }
         }

runtimes/java16/Handler.java

@@ -1,5 +1,7 @@
+import java.util.Map;
+
 public class Handler {
-    public static byte[] Handle(byte[] msg) throws Exception {
+    public static byte[] Handle(byte[] msg, Map<String,String> context) throws Exception {
         var x = "hi " + new String(msg);
         return x.getBytes();
     }

runtimes/java16/Main.java

@@ -1,5 +1,4 @@
 import com.sun.net.httpserver.HttpServer;
-
 import java.io.ByteArrayOutputStream;
 import java.io.InputStreamReader;
 import java.net.InetSocketAddress;
@@ -9,6 +8,7 @@
 import java.net.http.HttpResponse;
 import java.nio.charset.StandardCharsets;
 import java.util.concurrent.Executors;
+import java.util.Collections;
 
 public class Main {
     public static void main(String[] args) throws Exception {
@@ -25,7 +25,7 @@ public static void main(String[] args) throws Exception {
             }
             isr.close();
             try {
-                var out = Handler.Handle(in.toByteArray());
+                var out = Handler.Handle(in.toByteArray(), Collections.<String,String>emptyMap());
                 if (out != null) {
                     he.sendResponseHeaders(201, 0);
                     try (var os = he.getResponseBody()) {