001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel.processor.loadbalancer; 018 019import java.util.HashMap; 020import java.util.Iterator; 021import java.util.List; 022import java.util.Map; 023import java.util.concurrent.atomic.AtomicLong; 024 025/** 026 * Statistics about exception failures for load balancers that reacts on exceptions 027 */ 028public class ExceptionFailureStatistics { 029 030 private final Map<Class<?>, AtomicLong> counters = new HashMap<Class<?>, AtomicLong>(); 031 private final AtomicLong fallbackCounter = new AtomicLong(); 032 033 public void init(List<Class<?>> exceptions) { 034 if (exceptions != null) { 035 for (Class<?> exception : exceptions) { 036 counters.put(exception, new AtomicLong()); 037 } 038 } 039 } 040 041 public Iterator<Class<?>> getExceptions() { 042 return counters.keySet().iterator(); 043 } 044 045 public long getFailureCounter(Class<?> exception) { 046 AtomicLong counter = counters.get(exception); 047 if (counter != null) { 048 return counter.get(); 049 } else { 050 return fallbackCounter.get(); 051 } 052 } 053 054 public void onHandledFailure(Exception exception) { 055 Class<?> clazz = exception.getClass(); 056 057 AtomicLong counter = counters.get(clazz); 058 if (counter != null) { 059 counter.incrementAndGet(); 060 } else { 061 fallbackCounter.incrementAndGet(); 062 } 063 } 064 065 public void reset() { 066 for (AtomicLong counter : counters.values()) { 067 counter.set(0); 068 } 069 fallbackCounter.set(0); 070 } 071} 072