Merge branch 'master' of github.com:qos-ch/slf4j

Author: ceki

slf4j-api/src/main/java/org/slf4j/Logger.java

@@ -37,6 +37,7 @@
 import static org.slf4j.event.Level.WARN;
 
 import org.slf4j.event.Level;
+import org.slf4j.helpers.CheckReturnValue;
 import org.slf4j.spi.DefaultLoggingEventBuilder;
 import org.slf4j.spi.LoggingEventBuilder;
 import org.slf4j.spi.NOPLoggingEventBuilder;
@@ -107,6 +108,7 @@ public interface Logger {
      * @return a new {@link LoggingEventBuilder} instance as appropriate for this logger
      * @since 2.0
      */
+    @CheckReturnValue
     default public LoggingEventBuilder makeLoggingEventBuilder(Level level) {
         return new DefaultLoggingEventBuilder(this, level);
     }
@@ -121,6 +123,7 @@ default public LoggingEventBuilder makeLoggingEventBuilder(Level level) {
      * @return a new {@link LoggingEventBuilder} instance as appropriate for this logger
      * @since 2.0
      */
+    @CheckReturnValue
     default public LoggingEventBuilder atLevel(Level level) {
         if (isEnabledForLevel(level)) {
             return makeLoggingEventBuilder(level);
@@ -243,6 +246,7 @@ default public boolean isEnabledForLevel(Level level) {
      * @return LoggingEventBuilder instance as appropriate for level TRACE
      * @since 2.0
      */
+    @CheckReturnValue
     default public LoggingEventBuilder atTrace() {
         if (isTraceEnabled()) {
             return makeLoggingEventBuilder(TRACE);
@@ -439,6 +443,7 @@ default public LoggingEventBuilder atTrace() {
      * @return LoggingEventBuilder instance as appropriate for level DEBUG
      * @since 2.0
      */
+    @CheckReturnValue
     default public LoggingEventBuilder atDebug() {
         if (isDebugEnabled()) {
             return makeLoggingEventBuilder(DEBUG);
@@ -579,6 +584,7 @@ default public LoggingEventBuilder atDebug() {
      * @return LoggingEventBuilder instance as appropriate for level INFO
      * @since 2.0
      */
+    @CheckReturnValue
     default public LoggingEventBuilder atInfo() {
         if (isInfoEnabled()) {
             return makeLoggingEventBuilder(INFO);
@@ -719,6 +725,7 @@ default public LoggingEventBuilder atInfo() {
      * @return LoggingEventBuilder instance as appropriate for level WARN
      * @since 2.0
      */
+    @CheckReturnValue
     default public LoggingEventBuilder atWarn() {
         if (isWarnEnabled()) {
             return makeLoggingEventBuilder(WARN);
@@ -860,6 +867,7 @@ default public LoggingEventBuilder atWarn() {
      * @return LoggingEventBuilder instance as appropriate for level ERROR
      * @since 2.0
      */
+    @CheckReturnValue
     default public LoggingEventBuilder atError() {
         if (isErrorEnabled()) {
             return makeLoggingEventBuilder(ERROR);