001/*
002 * CDDL HEADER START
003 *
004 * The contents of this file are subject to the terms of the
005 * Common Development and Distribution License, Version 1.0 only
006 * (the "License").  You may not use this file except in compliance
007 * with the License.
008 *
009 * You can obtain a copy of the license at
010 * docs/licenses/cddl.txt
011 * or http://www.opensource.org/licenses/cddl1.php.
012 * See the License for the specific language governing permissions
013 * and limitations under the License.
014 *
015 * When distributing Covered Code, include this CDDL HEADER in each
016 * file and include the License file at
017 * docs/licenses/cddl.txt.  If applicable,
018 * add the following below this CDDL HEADER, with the fields enclosed
019 * by brackets "[]" replaced with your own identifying information:
020 *      Portions Copyright [yyyy] [name of copyright owner]
021 *
022 * CDDL HEADER END
023 *
024 *
025 *      Copyright 2011-2017 Ping Identity Corporation
026 */
027package com.unboundid.directory.sdk.common.scripting;
028
029
030
031import java.util.List;
032
033import com.unboundid.directory.sdk.broker.internal.BrokerExtension;
034import com.unboundid.directory.sdk.common.config.FileBasedErrorLoggerConfig;
035import com.unboundid.directory.sdk.common.internal.Reconfigurable;
036import com.unboundid.directory.sdk.common.types.LogCategory;
037import com.unboundid.directory.sdk.common.types.LogSeverity;
038import com.unboundid.directory.sdk.common.types.ServerContext;
039import com.unboundid.directory.sdk.metrics.internal.MetricsEngineExtension;
040import com.unboundid.directory.sdk.proxy.internal.DirectoryProxyServerExtension;
041import com.unboundid.directory.sdk.ds.internal.DirectoryServerExtension;
042import com.unboundid.directory.sdk.sync.internal.SynchronizationServerExtension;
043import com.unboundid.ldap.sdk.LDAPException;
044import com.unboundid.ldap.sdk.ResultCode;
045import com.unboundid.util.Extensible;
046import com.unboundid.util.ThreadSafety;
047import com.unboundid.util.ThreadSafetyLevel;
048import com.unboundid.util.args.ArgumentException;
049import com.unboundid.util.args.ArgumentParser;
050
051
052
053/**
054 * This class defines an API that may be used to create a specific type of
055 * scripted error logger which is intended to write log messages to text files.
056 * This is a convenience for developers which wish to create custom error
057 * loggers that write to text files and provides support for a wide range of
058 * functionality including high-performance and highly-concurrent logging.  All
059 * of the options available to {@link ScriptedErrorLogger} implementations are
060 * available for file-based error loggers, as well as options for indicating
061 * the log file path, the rotation and retention policies, whether to buffer the
062 * output, etc.
063 * <BR><BR>
064 * Note that scripted file-based error loggers will automatically be registered
065 * within the server as disk space consumers, so there is no need to implement
066 * the {@link com.unboundid.directory.sdk.common.api.DiskSpaceConsumer}
067 * interface.  Also note that configuration change related to the log file
068 * (e.g., the log file path, buffer size, queue size, etc.) will also
069 * automatically be handled by the server, so subclasses only need to be
070 * concerned about changes to the custom arguments they define.
071 * <BR>
072 * <H2>Configuring File-Based Error Loggers</H2>
073 * In order to configure an error logger created using this API, use a command
074 * like:
075 * <PRE>
076 *      dsconfig create-log-publisher \
077 *           --publisher-name "<I>{logger-name}</I>" \
078 *           --type groovy-scripted-file-based-error \
079 *           --set enabled:true \
080 *           --set "log-file:<I>{path}</I>" \
081 *           --set "rotation-policy:<I>{rotation-policy-name}</I>" \
082 *           --set "retention-policy:<I>{retention-policy-name}</I>" \
083 *           --set "script-class:<I>{class-name}</I>" \
084 *           --set "script-argument:<I>{name=value}</I>"
085 * </PRE>
086 * where "<I>{logger-name}</I>" is the name to use for the error logger
087 * instance, "<I>{path}</I>" is the path to the log file to be written,
088 * "<I>{rotation-policy-name}</I>" is the name of the log rotation policy to use
089 * for the log file, "<I>{retention-policy-name}</I>" is the name of the log
090 * retention policy to use for the log file, "<I>{class-name}</I>" is the
091 * fully-qualified name of the Groovy class written using this API, and
092 * "<I>{name=value}</I>" represents name-value pairs for any arguments to
093 * provide to the logger.  If multiple arguments should be provided to the
094 * logger, then the "<CODE>--set script-argument:<I>{name=value}</I></CODE>"
095 * option should be provided multiple times.  It is also possible to specify
096 * multiple log rotation and/or retention policies if desired.
097 *
098 * @see  com.unboundid.directory.sdk.common.api.ErrorLogger
099 * @see  com.unboundid.directory.sdk.common.api.FileBasedErrorLogger
100 * @see  ScriptedErrorLogger
101 */
102@Extensible()
103@DirectoryServerExtension()
104@DirectoryProxyServerExtension(appliesToLocalContent=true,
105     appliesToRemoteContent=false)
106@SynchronizationServerExtension(appliesToLocalContent=true,
107     appliesToSynchronizedContent=false)
108@MetricsEngineExtension()
109@BrokerExtension()
110@ThreadSafety(level=ThreadSafetyLevel.INTERFACE_THREADSAFE)
111public abstract class ScriptedFileBasedErrorLogger
112       implements Reconfigurable<FileBasedErrorLoggerConfig>
113{
114  /**
115   * Creates a new instance of this file-based error logger.  All file-based
116   * error logger implementations must include a default constructor, but any
117   * initialization should generally be done in the
118   * {@code initializeErrorLogger} method.
119   */
120  public ScriptedFileBasedErrorLogger()
121  {
122    // No implementation is required.
123  }
124
125
126
127  /**
128   * {@inheritDoc}
129   */
130  public void defineConfigArguments(final ArgumentParser parser)
131         throws ArgumentException
132  {
133    // No arguments will be allowed by default.
134  }
135
136
137
138  /**
139   * Initializes this file-based error logger.
140   *
141   * @param  serverContext  A handle to the server context for the server in
142   *                        which this extension is running.
143   * @param  config         The general configuration for this file-based error
144   *                        logger.
145   * @param  parser         The argument parser which has been initialized from
146   *                        the configuration for this file-based error logger.
147   *
148   * @throws  LDAPException  If a problem occurs while initializing this
149   *                         file-based error logger.
150   */
151  public void initializeErrorLogger(final ServerContext serverContext,
152                                    final FileBasedErrorLoggerConfig config,
153                                    final ArgumentParser parser)
154         throws LDAPException
155  {
156    // No initialization will be performed by default.
157  }
158
159
160
161  /**
162   * Performs any cleanup which may be necessary when this file-based error
163   * logger is to be taken out of service.
164   */
165  public void finalizeErrorLogger()
166  {
167    // No implementation is required.
168  }
169
170
171
172  /**
173   * {@inheritDoc}
174   */
175  public boolean isConfigurationAcceptable(
176                      final FileBasedErrorLoggerConfig config,
177                      final ArgumentParser parser,
178                      final List<String> unacceptableReasons)
179  {
180    // No extended validation will be performed.
181    return true;
182  }
183
184
185
186  /**
187   * {@inheritDoc}
188   */
189  public ResultCode applyConfiguration(final FileBasedErrorLoggerConfig config,
190                                       final ArgumentParser parser,
191                                       final List<String> adminActionsRequired,
192                                       final List<String> messages)
193  {
194    // If there are any custom arguments, then add an admin action message
195    // indicating that the extension needs to be restarted for any changes to
196    // take effect.
197    if (! parser.getNamedArguments().isEmpty())
198    {
199      adminActionsRequired.add(
200           "If any extension-argument values have been altered, then " +
201                "those new values have not actually been applied.  The new " +
202                "configuration for those arguments will not take effect " +
203                "until this file-based error logger is disabled and " +
204                "re-enabled, or until the server is restarted.");
205    }
206
207    return ResultCode.SUCCESS;
208  }
209
210
211
212  /**
213   * Records information about the provided message, if appropriate.
214   *
215   * @param  category   The category for the message to be logged.
216   * @param  severity   The severity for the message to be logged.
217   * @param  messageID  The unique identifier with which the message text is
218   *                    associated.
219   * @param  message    The message to be logged.
220   *
221   * @return  The content of the log message that should be written.  It may be
222   *          {@code null} or empty if no message should be written.  It may
223   *          optionally include line breaks if the log message should span
224   *          multiple lines.
225   */
226  public abstract CharSequence logError(final LogCategory category,
227                                        final LogSeverity severity,
228                                        final long messageID,
229                                        final String message);
230}