| /** |
| * 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 |
| * |
| * http://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.htrace.impl; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.commons.logging.Log; |
| |
| /** |
| * A logger which rate-limits its logging to a configurable level. |
| */ |
| class RateLimitedLogger { |
| private final Log log; |
| private final long timeoutMs; |
| private long lastLogTimeMs; |
| |
| public RateLimitedLogger(Log log, long timeoutMs) { |
| this.log = log; |
| this.timeoutMs = timeoutMs; |
| synchronized (this) { |
| this.lastLogTimeMs = 0L; |
| } |
| } |
| |
| public void warn(String what) { |
| long now = TimeUnit.MILLISECONDS.convert(System.nanoTime(), |
| TimeUnit.NANOSECONDS); |
| synchronized (this) { |
| if (now >= lastLogTimeMs + timeoutMs) { |
| log.warn(what); |
| lastLogTimeMs = now; |
| } |
| } |
| } |
| |
| public void error(String what) { |
| long now = TimeUnit.MILLISECONDS.convert(System.nanoTime(), |
| TimeUnit.NANOSECONDS); |
| synchronized (this) { |
| if (now >= lastLogTimeMs + timeoutMs) { |
| log.error(what); |
| lastLogTimeMs = now; |
| } |
| } |
| } |
| |
| public void error(String what, Throwable e) { |
| long now = TimeUnit.MILLISECONDS.convert(System.nanoTime(), |
| TimeUnit.NANOSECONDS); |
| synchronized (this) { |
| if (now >= lastLogTimeMs + timeoutMs) { |
| log.error(what, e); |
| lastLogTimeMs = now; |
| } |
| } |
| } |
| } |