/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at
* docs/licenses/cddl.txt
* or http://www.opensource.org/licenses/cddl1.php.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at
* docs/licenses/cddl.txt. If applicable,
* add the following below this CDDL HEADER, with the fields enclosed
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*
* Copyright 2010-2013 UnboundID Corp.
*/
package com.unboundid.directory.sdk.examples.groovy;
import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.util.Date;
import java.util.List;
import com.unboundid.directory.sdk.common.config.ErrorLoggerConfig;
import com.unboundid.directory.sdk.common.scripting.ScriptedErrorLogger;
import com.unboundid.directory.sdk.common.types.LogCategory;
import com.unboundid.directory.sdk.common.types.LogSeverity;
import com.unboundid.directory.sdk.common.types.ServerContext;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.ResultCode;
import com.unboundid.util.StaticUtils;
import com.unboundid.util.args.ArgumentException;
import com.unboundid.util.args.ArgumentParser;
import com.unboundid.util.args.FileArgument;
/**
* This class provides a simple example of a scripted error logger that will
* append a message to a specified file about any errors, warnings, or events in
* the server. It takes a single configuration argument:
* <UL>
* <LI>log-file -- The path to the log file that will be written. This must
* be provided.</LI>
* </UL>
*/
public final class ExampleScriptedErrorLogger
extends ScriptedErrorLogger
{
/**
* The name of the argument that will be used for the argument used to specify
* the path to the log file.
*/
private static final String ARG_NAME_LOG_FILE = "log-file";
// The path to the log file to be written.
private volatile File logFile;
// The lock that will be used to synchronize logging activity.
private final Object loggerLock;
// The print writer that will be used to actually write the log messages.
private volatile PrintWriter writer;
// The server context for the server in which this extension is running.
private ServerContext serverContext;
/**
* Creates a new instance of this error logger. All error logger
* implementations must include a default constructor, but any initialization
* should generally be done in the {@code initializeErrorLogger} method.
*/
public ExampleScriptedErrorLogger()
{
loggerLock = new Object();
}
/**
* Updates the provided argument parser to define any configuration arguments
* which may be used by this error logger. The argument parser may also
* be updated to define relationships between arguments (e.g., to specify
* required, exclusive, or dependent argument sets).
*
* @param parser The argument parser to be updated with the configuration
* arguments which may be used by this error logger.
*
* @throws ArgumentException If a problem is encountered while updating the
* provided argument parser.
*/
@Override()
public void defineConfigArguments(final ArgumentParser parser)
throws ArgumentException
{
// Add an argument that allows you to specify the path to the log file.
Character shortIdentifier = null;
String longIdentifier = ARG_NAME_LOG_FILE;
boolean required = true;
int maxOccurrences = 1;
String placeholder = "{path}";
String description = "The path to the log file to be written. " +
"Non-absolute paths will be treated as relative to the server root.";
boolean fileMustExist = false;
boolean parentMustExist = true;
boolean mustBeFile = true;
boolean mustBeDirectory = false;
parser.addArgument(new FileArgument(shortIdentifier, longIdentifier,
required, maxOccurrences, placeholder, description, fileMustExist,
parentMustExist, mustBeFile, mustBeDirectory));
}
/**
* Initializes this error logger.
*
* @param serverContext A handle to the server context for the server in
* which this extension is running.
* @param config The general configuration for this error logger.
* @param parser The argument parser which has been initialized from
* the configuration for this error logger.
*
* @throws LDAPException If a problem occurs while initializing this error
* logger.
*/
@Override()
public void initializeErrorLogger(final ServerContext serverContext,
final ErrorLoggerConfig config,
final ArgumentParser parser)
throws LDAPException
{
this.serverContext = serverContext;
// Create the logger and open the log file.
try
{
final FileArgument arg =
(FileArgument) parser.getNamedArgument(ARG_NAME_LOG_FILE);
logFile = arg.getValue();
writer = new PrintWriter(new FileWriter(logFile, true));
}
catch (final Exception e)
{
serverContext.debugCaught(e);
throw new LDAPException(ResultCode.OTHER,
"Unable to open file " + logFile.getAbsolutePath() +
" for writing: " + StaticUtils.getExceptionMessage(e),
e);
}
}
/**
* Indicates whether the configuration contained in the provided argument
* parser represents a valid configuration for this extension.
*
* @param config The general configuration for this error
* logger.
* @param parser The argument parser which has been initialized
* with the proposed configuration.
* @param unacceptableReasons A list that can be updated with reasons that
* the proposed configuration is not acceptable.
*
* @return {@code true} if the proposed configuration is acceptable, or
* {@code false} if not.
*/
@Override()
public boolean isConfigurationAcceptable(final ErrorLoggerConfig config,
final ArgumentParser parser,
final List<String> unacceptableReasons)
{
// The argument parser will handle all of the necessary validation, so
// we don't need to do anything here.
return true;
}
/**
* Attempts to apply the configuration contained in the provided argument
* parser.
*
* @param config The general configuration for this error
* logger.
* @param parser The argument parser which has been
* initialized with the new configuration.
* @param adminActionsRequired A list that can be updated with information
* about any administrative actions that may be
* required before one or more of the
* configuration changes will be applied.
* @param messages A list that can be updated with information
* about the result of applying the new
* configuration.
*
* @return A result code that provides information about the result of
* attempting to apply the configuration change.
*/
@Override()
public ResultCode applyConfiguration(final ErrorLoggerConfig config,
final ArgumentParser parser,
final List<String> adminActionsRequired,
final List<String> messages)
{
// Get the path to the log file from the new config.
final FileArgument arg =
(FileArgument) parser.getNamedArgument(ARG_NAME_LOG_FILE);
final File newFile = arg.getValue();
// If the log file path hasn't changed, then we don't need to do anything.
if (newFile.equals(logFile))
{
return ResultCode.SUCCESS;
}
// Create a print writer that can be used to write to the new log file.
final PrintWriter newWriter;
try
{
newWriter = new PrintWriter(new FileWriter(newFile, true));
}
catch (final Exception e)
{
serverContext.debugCaught(e);
messages.add("Unable to open new log file " + newFile.getAbsolutePath() +
" for writing: " + StaticUtils.getExceptionMessage(e));
return ResultCode.OTHER;
}
// Swap the new logger into place.
final PrintWriter oldWriter;
synchronized (loggerLock)
{
oldWriter = writer;
writer = newWriter;
logFile = newFile;
}
// Close the old logger and return success.
oldWriter.close();
return ResultCode.SUCCESS;
}
/**
* Performs any cleanup which may be necessary when this error logger is
* to be taken out of service.
*/
@Override()
public void finalizeErrorLogger()
{
synchronized (loggerLock)
{
writer.close();
writer = null;
logFile = null;
}
}
/**
* Records information about the provided message, if appropriate.
*
* @param category The category for the message to be logged.
* @param severity The severity for the message to be logged.
* @param messageID The unique identifier with which the message text is
* associated.
* @param message The message to be logged.
*/
@Override()
public void logError(final LogCategory category, final LogSeverity severity,
final long messageID, final String message)
{
final StringBuilder buffer = new StringBuilder();
buffer.append(new Date());
buffer.append(" severity=");
buffer.append(severity.name());
buffer.append(" message=\"");
buffer.append(message);
buffer.append('"');
synchronized (loggerLock)
{
if (writer == null)
{
// This should only happen if the logger has been shut down.
return;
}
writer.println(buffer.toString());
}
}
}
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