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annotate src/org/tmatesoft/hg/core/SessionContext.java @ 456:909306e412e2

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Refactor LogFacility and SessionContext, better API for both
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 18 Jun 2012 16:54:00 +0200
parents 3cfa4d908fc9
children b3c16d1aede0
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.core;
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18
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19 import org.tmatesoft.hg.util.LogFacility;
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20
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21 /**
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22 * Access to objects that might need to be shared between various distinct operations ran during the same working session
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23 * (i.e. caches, log, etc.). It's unspecified whether session context is per repository or can span multiple repositories
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24 *
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25 * <p>Note, API is likely to be extended in future versions, adding more object to share.
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26 *
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27 * @author Artem Tikhomirov
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28 * @author TMate Software Ltd.
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29 */
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30 public abstract class SessionContext {
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31 // abstract class to facilitate adding more functionality without API break
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32
3cfa4d908fc9 Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
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33 /**
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34 * Access wrapper for a system log facility.
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35 * @return facility to direct dumps to, never <code>null</code>
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36 */
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37 public abstract LogFacility getLog();
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38
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39 /**
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40 * Access configuration parameters of the session.
909306e412e2 Refactor LogFacility and SessionContext, better API for both
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41 * @param name name of the session configuration parameter
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42 * @param defaultValue value to return if parameter is not configured
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43 * @return value of the session parameter, defaultValue if none found
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44 */
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45 public abstract Object getConfigurationProperty(String name, Object defaultValue);
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46 // perhaps, later may add Configuration object, with PropertyMarshal's helpers
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47 // e.g. when there's standalone Caches and WritableSessionProperties objects
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48 }