001    // Copyright 2006, 2007, 2008 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    // http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.ioc.internal.services;
016    
017    import java.util.Set;
018    
019    import org.apache.tapestry5.ioc.ScopeConstants;
020    import org.apache.tapestry5.ioc.annotations.PreventServiceDecoration;
021    import org.apache.tapestry5.ioc.annotations.Scope;
022    import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
023    import org.apache.tapestry5.ioc.services.ExceptionTracker;
024    
025    @Scope(ScopeConstants.PERTHREAD)
026    @PreventServiceDecoration
027    public class ExceptionTrackerImpl implements ExceptionTracker
028    {
029        private final Set<Throwable> exceptions = CollectionFactory.newSet();
030    
031        public boolean exceptionLogged(Throwable exception)
032        {
033            boolean result = exceptions.contains(exception);
034    
035            exceptions.add(exception);
036    
037            return result;
038        }
039    }