Added IntervalLogger which emits a log msg once per time interval

Fixes #4409

core/src/main/java/org/apache/accumulo/core/logging/IntervalLogger.java

@@ -0,0 +1,110 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.accumulo.core.logging;
+
+import java.time.Duration;
+
+import org.slf4j.Logger;
+import org.slf4j.Marker;
+import org.slf4j.event.Level;
+import org.slf4j.helpers.AbstractLogger;
+
+/**
+ * Logger that wraps another Logger and only emits a log message once per the supplied duration.
+ *
+ */
+public class IntervalLogger extends AbstractLogger {
+
+  private static final long serialVersionUID = 1L;
+
+  private final Logger delegate;
+  private final long intervalNanos;
+
+  private volatile long last = 0L;
+
+  public IntervalLogger(Logger log, Duration interval) {
+    this.delegate = log;
+    this.intervalNanos = interval.toNanos();
+  }
+
+  @Override
+  public boolean isTraceEnabled() {
+    return delegate.isTraceEnabled();
+  }
+
+  @Override
+  public boolean isTraceEnabled(Marker marker) {
+    return delegate.isTraceEnabled(marker);
+  }
+
+  @Override
+  public boolean isDebugEnabled() {
+    return delegate.isDebugEnabled();
+  }
+
+  @Override
+  public boolean isDebugEnabled(Marker marker) {
+    return delegate.isDebugEnabled(marker);
+  }
+
+  @Override
+  public boolean isInfoEnabled() {
+    return delegate.isInfoEnabled();
+  }
+
+  @Override
+  public boolean isInfoEnabled(Marker marker) {
+    return delegate.isInfoEnabled(marker);
+  }
+
+  @Override
+  public boolean isWarnEnabled() {
+    return delegate.isWarnEnabled();
+  }
+
+  @Override
+  public boolean isWarnEnabled(Marker marker) {
+    return delegate.isWarnEnabled(marker);
+  }
+
+  @Override
+  public boolean isErrorEnabled() {
+    return delegate.isErrorEnabled();
+  }
+
+  @Override
+  public boolean isErrorEnabled(Marker marker) {
+    return delegate.isErrorEnabled(marker);
+  }
+
+  @Override
+  protected String getFullyQualifiedCallerName() {
+    return delegate.getName();
+  }
+
+  @Override
+  protected void handleNormalizedLoggingCall(Level level, Marker marker, String messagePattern,
+      Object[] arguments, Throwable throwable) {
+    if (System.nanoTime() - last > intervalNanos) {
+      delegate.atLevel(level).addMarker(marker).setCause(throwable).log(messagePattern, arguments);
+      last = System.nanoTime();
+    }
+  }
+
+}