Allow App To Choose Between MsgResponse Sinks

- MZS Schema Change: Add "MsgResponseSinks" element to
  mzs:DeliveryRequest/Config that allows sender to configure how
  MsgResponses should be archived.
- ConfigUtil: Interpret MsgResponseSink parameters from Spring
  Environment and merge with ConfigType.
- MsgResponseBackend: Send responses to sinks according to
  MsgResponseSinks in Config
- application.yaml: Add MsgResponseSinks parameter to configuration.
- Uncouple Sink implementations from java.util.function.Function,
  because the sink interfaces are going to differ and there is no need
  to unite them under one interface.
- Add and test LogResponseSink, which logs responses to it's logger.
- MsgResponse: Add JAXB getter for response. Reason: Can be passed to
  marshaller.

1 files changed, 44 insertions, 0 deletions

diff --git a/src/main/java/at/gv/egiz/moazs/backend/LogResponseSink.java b/src/main/java/at/gv/egiz/moazs/backend/LogResponseSink.java
new file mode 100644
index 0000000..d419944
--- /dev/null
+++ b/src/main/java/at/gv/egiz/moazs/backend/LogResponseSink.java
@@ -0,0 +1,44 @@
+package at.gv.egiz.moazs.backend;
+
+import at.gv.egiz.moazs.scheme.Marshaller;
+import at.gv.egiz.moazs.scheme.MsgResponse;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Component;
+
+import java.util.concurrent.CompletableFuture;
+
+import static java.util.concurrent.CompletableFuture.completedFuture;
+
+@Component
+public class LogResponseSink {
+
+    private static final Logger log = LoggerFactory.getLogger(LogResponseSink.class);
+    private static final String LOG_LEVEL_WARN_MESSAGE = "Will not log response because INFO level is disabled.";
+
+    private final Marshaller msgMarshaller;
+
+    public LogResponseSink(Marshaller msgMarshaller) {
+        this.msgMarshaller = msgMarshaller;
+    }
+
+    /**
+     * Log response to class logger at level=INFO.
+     *
+     * @param msgResponse
+     * @return
+     */
+    public CompletableFuture<Void> log(MsgResponse msgResponse) {
+
+        if(log.isInfoEnabled()) {
+            var builder = new StringBuilder("Received the following Message: \n");
+            builder.append(msgMarshaller.marshallXml(msgResponse.getResponseAsJAXBElement()));
+            log.info(builder.toString());
+        } else {
+            log.warn(LOG_LEVEL_WARN_MESSAGE);
+        }
+
+        return completedFuture(null);
+
+    }
+}