Added Logger#warn(String, Throwable)

And removed unused test events based infrastructure.

Author: lutovich

driver/src/main/java/org/neo4j/driver/internal/logging/DelegatingLogger.java

@@ -56,6 +56,12 @@ public void warn( String message, Object... params )
         delegate.warn( messageWithPrefix( message ), params );
     }
 
+    @Override
+    public void warn( String message, Throwable cause )
+    {
+        delegate.warn( messageWithPrefix( message ), cause );
+    }
+
     @Override
     public void debug( String message, Object... params )
     {

driver/src/main/java/org/neo4j/driver/internal/logging/DevNullLogger.java

@@ -43,6 +43,11 @@ public void warn( String message, Object... params )
     {
     }
 
+    @Override
+    public void warn( String message, Throwable cause )
+    {
+    }
+
     @Override
     public void debug( String message, Object... params )
     {

driver/src/main/java/org/neo4j/driver/internal/logging/JULogger.java

@@ -54,6 +54,12 @@ public void warn( String format, Object... params )
         delegate.log( Level.WARNING, String.format( format, params ) );
     }
 
+    @Override
+    public void warn( String message, Throwable cause )
+    {
+        delegate.log( Level.WARNING, message, cause );
+    }
+
     @Override
     public void debug( String format, Object... params )
     {

driver/src/main/java/org/neo4j/driver/v1/Logger.java

@@ -25,29 +25,41 @@ public interface Logger
 {
     /**
      * Logs errors from this driver
+     *
      * @param message the error message
      * @param cause the cause of the error
      */
     void error( String message, Throwable cause );
 
     /**
      * Logs information from the driver
+     *
      * @param message the information message
      * @param params parameters used in the information message
      */
     void info( String message, Object... params );
 
     /**
      * Logs warnings that happened during using the driver
+     *
      * @param message the warning message
      * @param params parameters used in the warning message
      */
     void warn( String message, Object... params );
 
+    /**
+     * Logs warnings that happened during using the driver
+     *
+     * @param message the warning message
+     * @param cause the cause of the warning
+     */
+    void warn( String message, Throwable cause );
+
     /**
      * Logs bolt messages sent and received by this driver.
      * It is only enabled when {@link Logger#isDebugEnabled()} returns {@code True}.
      * This logging level generates a lot of log entries.
+     *
      * @param message the bolt message
      * @param params parameters used in generating the bolt message
      */
@@ -57,22 +69,25 @@ public interface Logger
      * Logs binary sent and received by this driver.
      * It is only enabled when {@link Logger#isTraceEnabled()} returns {@code True}.
      * This logging level generates huge amount of log entries.
+     *
      * @param message the bolt message in hex
      * @param params parameters used in generating the hex message
      */
     void trace( String message, Object... params );
 
     /**
      * Return true if the trace logging level is enabled.
-     * @see Logger#trace(String, Object...)
+     *
      * @return true if the trace logging level is enabled.
+     * @see Logger#trace(String, Object...)
      */
     boolean isTraceEnabled();
 
     /**
      * Return true if the debug level is enabled.
-     * @see Logger#debug(String, Object...)
+     *
      * @return true if the debug level is enabled.
+     * @see Logger#debug(String, Object...)
      */
     boolean isDebugEnabled();
 }