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d3e08db677
5447: (From V1.4 5278, 5279, 5280, 5285, 5298, 5299, 5304): Hibernate session size management for large transactions git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@5481 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
87 lines
3.1 KiB
Java
87 lines
3.1 KiB
Java
/*
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* Copyright (C) 2005-2007 Alfresco Software Limited.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* As a special exception to the terms and conditions of version 2.0 of
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* the GPL, you may redistribute this Program in connection with Free/Libre
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* and Open Source Software ("FLOSS") applications as described in Alfresco's
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* FLOSS exception. You should have recieved a copy of the text describing
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* the FLOSS exception, and it is also available here:
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* http://www.alfresco.com/legal/licensing
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*/
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package org.alfresco.util.resource;
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import java.lang.reflect.Method;
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import java.util.Map;
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/**
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* A controller of system or in-transaction resources. Given a few statistics
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* regarding a method's call history, and using whatever other measurements
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* are needed, implementations will decide whether and how to clear up
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* sufficient system resources.
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*
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* @author Derek Hulley
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*/
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public interface MethodResourceManager
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{
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/**
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* Helper class to carry basic method call statistics.
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*/
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public static class MethodStatistics
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{
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private long callCount;
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private long accumulatedTimeNs;
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public void accumulateNs(long durationNs)
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{
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accumulatedTimeNs += durationNs;
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callCount++;
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}
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public long getAccumulatedTimeNs()
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{
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return accumulatedTimeNs;
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}
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public long getCallCount()
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{
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return callCount;
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}
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/**
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* @return Returns the average call time in nanoseconds
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*/
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public double getAverageCallTimeNs()
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{
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if (callCount == 0)
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{
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return 0.0D;
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}
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return (double) accumulatedTimeNs / (double) callCount;
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}
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}
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/**
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* Check and free any required resources for an imminent. Details of the
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* current transaction and some gathered information about previous calls
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* to associated methods is also provided.
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*
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* @param methodStatsByMethod all known methods and their basic call stats
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* @param transactionElapsedTimeNs the elapsed time in the current transaction
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* @param currentMethod the method about to be called
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*/
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public void manageResources(
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Map<Method, MethodStatistics> methodStatsByMethod,
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long transactionElapsedTimeNs,
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Method currentMethod);
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}
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