Add setter for log prefix in ObjectLogger and StreamLogger. (#164)

Deprecate constructor with prefix argument.

Author: blackwinter

metafacture-monitoring/src/main/java/org/metafacture/monitoring/ObjectLogger.java

@@ -41,25 +41,36 @@ public final class ObjectLogger<T>
 
     private static final MetafactureLogger LOG = new MetafactureLogger(ObjectLogger.class);
 
-    private final String logPrefix;
+    private String logPrefix = "";
 
     /**
      * Creates an instance of {@link ObjectLogger}.
      */
     public ObjectLogger() {
-        this("");
     }
 
     /**
      * Creates an instance of {@link ObjectLogger} by a given prefix of the log
      * messages.
      *
+     * @deprecated Use {@link #setPrefix} instead.
+     *
      * @param logPrefix the prefix of the log messages
      */
+    @Deprecated/*(since="9.0", forRemoval=true)*/
     public ObjectLogger(final String logPrefix) {
         this.logPrefix = logPrefix;
     }
 
+    /**
+     * Sets the prefix used when logging messages.
+     *
+     * @param prefix the prefix of the log messages
+     */
+    public void setPrefix(final String prefix) {
+        this.logPrefix = prefix;
+    }
+
     @Override
     public void process(final T obj) {
         LOG.externalDebug("{}{}", logPrefix, obj);

metafacture-monitoring/src/main/java/org/metafacture/monitoring/StreamLogger.java

@@ -41,23 +41,34 @@ public final class StreamLogger
 
     private static final MetafactureLogger LOG = new MetafactureLogger(StreamLogger.class);
 
-    private final String logPrefix;
+    private String logPrefix = "";
 
     /**
      * Creates an instance of {@link StreamLogger}.
      */
     public StreamLogger() {
-        this("");
     }
 
     /**
      * Creates an instance of {@link StreamLogger} by a given prefix used when log
      * messages.
      *
+     * @deprecated Use {@link #setPrefix} instead.
+     *
      * @param logPrefix the prefix of the log messages
      */
+    @Deprecated/*(since="9.0", forRemoval=true)*/
     public StreamLogger(final String logPrefix) {
-        this.logPrefix = logPrefix;
+        setPrefix(logPrefix);
+    }
+
+    /**
+     * Sets the prefix used when logging messages.
+     *
+     * @param prefix the prefix of the log messages
+     */
+    public void setPrefix(final String prefix) {
+        this.logPrefix = prefix;
     }
 
     @Override

metafacture-monitoring/src/test/java/org/metafacture/monitoring/ObjectLoggerTest.java

@@ -93,7 +93,7 @@ public void shouldActAsSinkIfNoReceiverIsSet() {
     @Test
     public void shouldLogWithPrefix() {
         final String prefix = "prefix:";
-        logger = new ObjectLogger<>(prefix);
+        logger.setPrefix(prefix);
 
         logger.process("object");
         logger.resetStream();

metafacture-monitoring/src/test/java/org/metafacture/monitoring/StreamLoggerTest.java

@@ -114,7 +114,7 @@ public void shouldActAsSinkIfNoReceiverIsSet() {
     @Test
     public void shouldLogWithPrefix() {
         final String prefix = "prefix:";
-        logger = new StreamLogger(prefix);
+        logger.setPrefix(prefix);
 
         logger.startRecord("1");
         logger.startEntity("entity");