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cefda8c965
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@18931 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
81 lines
2.7 KiB
Java
81 lines
2.7 KiB
Java
/*
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* Copyright (C) 2005-2010 Alfresco Software Limited.
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*
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* This file is part of Alfresco
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*
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* Alfresco is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Alfresco 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
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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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