Log environment variables (#2)

src/main/java/org/ois/core/utils/log/ILogger.java

@@ -7,6 +7,13 @@
  * warn, and error.
  */
 public interface ILogger {
+    /** Environment variable used by OIS products to set the log level **/
+    String ENV_LOG_LEVEL = "OIS_LOG_LEVEL";
+    /** Environment variable used by OIS products to set the log topics **/
+    String ENV_LOG_TOPICS = "OIS_LOG_TOPICS";
+    /** The default level of the logger **/
+    Level DEFAULT_LEVEL = Level.Info;
+
     /**
      * Enumeration representing the different log levels.
      */
@@ -22,15 +29,20 @@ enum Level {
      * @return the corresponding {@link Level} enum value
      */
     static Level toLogLevel(String logLevel) {
+        if (logLevel == null) {
+            return DEFAULT_LEVEL;
+        }
         switch (logLevel.trim().toLowerCase()) {
             case "debug":
                 return Level.Debug;
+            case "info":
+                return Level.Info;
             case "warn":
                 return Level.Warn;
             case "error":
                 return Level.Error;
             default:
-                return Level.Info;
+                return DEFAULT_LEVEL;
         }
     }
 

src/main/java/org/ois/core/utils/log/Logger.java

@@ -5,6 +5,7 @@
 import org.ois.core.runner.RunnerConfiguration;
 
 import java.util.*;
+import java.util.stream.Collectors;
 
 /**
  * Logger implementation for logging messages with various severity levels.
@@ -16,12 +17,19 @@
 public class Logger<T> implements ILogger {
     private static final Map<Class, Logger> logMap = new HashMap<>();
 
-    private static final Set<String> allowedTopics = new HashSet<>();
-    private static final ILogger.Level DEFAULT_LEVEL = Level.Info;
-    private static int minLogLevel = DEFAULT_LEVEL.ordinal();
+    private static final Set<String> allowedTopics = getInitialTopics();
+    private static int minLogLevel = ILogger.toLogLevel(System.getenv(ENV_LOG_LEVEL)).ordinal();
 
     private final Class<T> logClass;
 
+    private static Set<String> getInitialTopics() {
+        String topics = System.getenv(ENV_LOG_TOPICS);
+        if (topics == null) {
+            return new HashSet<>();
+        }
+        return Arrays.stream(topics.split(";")).collect(Collectors.toSet());
+    }
+
     /**
      * Private constructor for creating a logger instance.
      *