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/** |
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$Id $ |
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|
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Copyright (C) 2023 Nicklas Nordborg |
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|
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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8 |
|
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BASE 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 3 |
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of the License, or (at your option) any later version. |
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13 |
|
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BASE 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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18 |
|
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You should have received a copy of the GNU General Public License |
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along with BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util.extensions.logging; |
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|
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import java.util.Deque; |
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import java.util.HashMap; |
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import java.util.Iterator; |
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import java.util.Map; |
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import java.util.concurrent.ConcurrentLinkedDeque; |
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import java.util.concurrent.locks.Lock; |
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import java.util.concurrent.locks.ReadWriteLock; |
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import java.util.concurrent.locks.ReentrantReadWriteLock; |
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|
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import org.apache.commons.collections4.iterators.UnmodifiableIterator; |
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34 |
|
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/** |
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Instances hold the log entries for a single extension. |
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37 |
|
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@author nicklas |
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@since 3.19.8 |
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*/ |
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public class ExtensionsLog |
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{ |
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private static Map<String, ExtensionsLog> logs = new HashMap<>(); |
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|
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/** |
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Get the service log for the given extension. If the log |
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doens't exists yet it can optionally be created. |
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*/ |
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public static ExtensionsLog getLog(String extensionId, boolean create) |
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{ |
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ExtensionsLog log = logs.get(extensionId); |
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if (log == null && create) |
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{ |
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synchronized (logs) |
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{ |
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log = logs.get(extensionId); |
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if (log == null) |
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{ |
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log = new ExtensionsLog(extensionId); |
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logs.put(extensionId, log); |
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} |
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} |
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} |
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return log; |
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} |
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|
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/** |
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Get a logger that can add entries to the log for the given extension. |
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If the log doesn't exists yet, it can optionally be created. |
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*/ |
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public static ExtensionsLogger getLogger(String extensionId, boolean create) |
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{ |
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ExtensionsLog log = getLog(extensionId, create); |
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return log == null ? null : log.createLogger(); |
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} |
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|
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/** |
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Create a logger that can add entries to the log for the given extension. |
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If the log doesn't exists yet, it is be created. |
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*/ |
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public static ExtensionsLogger createLogger(String extensionId) |
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{ |
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return getLog(extensionId, true).createLogger(); |
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} |
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|
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private final String extensionId; |
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private final Deque<LogEntry> logEntries; |
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private final ReadWriteLock lock; |
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|
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private int maxEntries; |
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private volatile int numEntries; |
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private volatile int numWarnings; |
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private volatile int numErrors; |
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|
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private boolean isDebugEnabled; |
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private boolean copyToStdout; |
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|
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private ExtensionsLog(String extensionId) |
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{ |
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this.extensionId = extensionId; |
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this.logEntries = new ConcurrentLinkedDeque<>(); |
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this.maxEntries = 200; |
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this.lock = new ReentrantReadWriteLock(); |
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} |
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|
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/** |
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Get the extension id of the log. |
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*/ |
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public String getExtensionId() |
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{ |
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return extensionId; |
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} |
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|
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/** |
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Is the debug-level enabled? |
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*/ |
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public boolean isDebugEnabled() |
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{ |
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return isDebugEnabled; |
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} |
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|
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/** |
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Enable or disable debug-level logging. |
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*/ |
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public void setDebugEnabled(boolean debugEnabled) |
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{ |
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this.isDebugEnabled = debugEnabled; |
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} |
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|
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/** |
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Are log entries copied to standard output? |
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*/ |
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public boolean isCopyingToStdout() |
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{ |
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return copyToStdout; |
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} |
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|
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/** |
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Enable or disable copies of log entries to standard output. |
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When enabled, TRACE-level log entries are also written if |
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debugging is enabled. |
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*/ |
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public void setCopyToStdout(boolean copyToStdout) |
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{ |
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this.copyToStdout = copyToStdout; |
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} |
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|
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/** |
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Get the max number of entries to keep in the log. |
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*/ |
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public int getMaxEntries() |
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{ |
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return maxEntries; |
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} |
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|
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/** |
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Get the current number of entries in the log. |
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*/ |
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public int getNumEntries() |
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{ |
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return numEntries; |
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} |
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|
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/** |
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Get the current number of warning entries in the log. |
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*/ |
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public int getNumWarnings() |
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{ |
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return numWarnings; |
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} |
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|
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/** |
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Get the current number of error entries in the log. |
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*/ |
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public int getNumErrors() |
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{ |
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return numErrors; |
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} |
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|
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/** |
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Clear the log. |
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*/ |
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public void clearLog() |
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{ |
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// We need the write lock here since we are changing multiple properties |
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Lock l = lock.writeLock(); |
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try |
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{ |
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l.lock(); |
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logEntries.clear(); |
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numEntries = 0; |
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numWarnings = 0; |
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numErrors = 0; |
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} |
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finally |
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{ |
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l.unlock(); |
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} |
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} |
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|
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/** |
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Create a logger that adds messages to this log. |
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*/ |
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public ExtensionsLogger createLogger() |
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{ |
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return new ExtensionsLogger(this); |
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} |
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208 |
|
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209 |
/** |
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Add a log entry. |
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DEBUG level messages are skipped unless debug-level is enabled. |
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TRACE level messages are always skipped but can be written to |
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standard output if that option and debugging is enabled. |
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*/ |
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void add(LogEntry entry) |
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{ |
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if (copyToStdout && (entry.getLevel() != LogLevel.TRACE || isDebugEnabled)) |
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{ |
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System.out.println("["+extensionId+"] "+entry); |
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} |
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if (entry.getLevel() == LogLevel.TRACE || (entry.getLevel() == LogLevel.DEBUG && !isDebugEnabled)) |
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{ |
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09 Mar 23 |
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223 |
return; |
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224 |
} |
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// A read lock should be enough since we are using a ConcurrentLinkedDeque that supports multiple threads |
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226 |
Lock l = lock.readLock(); |
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07 Mar 23 |
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227 |
try |
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{ |
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07 Mar 23 |
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229 |
l.lock(); |
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230 |
logEntries.addFirst(entry); |
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231 |
if (entry.getLevel() == LogLevel.WARNING) numWarnings++; |
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if (entry.getLevel() == LogLevel.ERROR) numErrors++; |
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233 |
|
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if (++numEntries > maxEntries) |
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07 Mar 23 |
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{ |
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07 Mar 23 |
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// Remove one entry |
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07 Mar 23 |
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237 |
numEntries--; |
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07 Mar 23 |
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238 |
LogEntry last = logEntries.removeLast(); |
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09 Mar 23 |
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239 |
if (last.getLevel() == LogLevel.WARNING) numWarnings--; |
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240 |
if (last.getLevel() == LogLevel.ERROR) numErrors--; |
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07 Mar 23 |
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241 |
} |
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242 |
} |
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finally |
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{ |
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07 Mar 23 |
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245 |
l.unlock(); |
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246 |
} |
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247 |
} |
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22 Feb 23 |
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248 |
|
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249 |
/** |
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06 Mar 23 |
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Get an iterator that is returning all entries in the log. |
8119 |
06 Mar 23 |
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The returned iterator is read-only and the {@link Iterator#remove()} |
8119 |
06 Mar 23 |
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method will throw an exception. |
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06 Mar 23 |
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253 |
*/ |
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06 Mar 23 |
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254 |
public Iterator<LogEntry> getLogEntries() |
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06 Mar 23 |
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255 |
{ |
8119 |
06 Mar 23 |
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256 |
return UnmodifiableIterator.unmodifiableIterator(logEntries.iterator()); |
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257 |
} |
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|
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} |