| Oracle® Fusion Middleware Oracle WebLogic ServerにデプロイされたアプリケーションへのWebLogicロギング・サービスの追加 12c (12.2.1.3.0) E90338-01 |
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| Oracle® Fusion Middleware Oracle WebLogic ServerにデプロイされたアプリケーションへのWebLogicロギング・サービスの追加 12c (12.2.1.3.0) E90338-01 |
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Loggerクラスは、WebLogic Serverロギングのインタフェースを提供します。 この付録では、Loggerクラスについて説明し、メッセージ・カタログとそれに対応するLoggerクラスの例を示します。 i18ngenによって生成されるクラスは、Loggerと呼ばれています。Loggerクラスは、WebLogicロギングのインタフェースを提供します。カタログXyz.xmlの場合、LoggerクラスXyzLoggerが生成されます。 Loggerクラスは、カタログに定義されたすべてのメッセージをWebLogic Serverログに記録するメソッドを提供します。組み込まれているメソッドは、関連するカタログで定義されたものと同じです。カタログでloggables属性がtrueに指定されていると、メッセージごとにLoggableメソッドが併せて生成されます。「WebLogic Server用のLoggableオブジェクトのリファレンス」を参照してください。
weblogic.i18ngenユーティリティを使用して、ログ・メッセージ内のテキストのローカライズに使用されるLoggerクラスを生成できます。生成されたLoggerクラスの例を例D-1に示します。例D-1 生成されたLoggerクラスの例
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE message_catalog PUBLIC "weblogic-message-catalog-dtd"
"http://www.bea.com/servers/wls90/dtd/msgcat.dtd">
<message_catalog
i18n_package="examples.i18n.logging"
l10n_package="examples.i18n.logging"
subsystem="I18N"
version="1.0"
baseid="600000"
endid="610000"
loggables="true"
>
<logmessage
messageid="600000"
method="logEntry()"
severity="info"
>
<messagebody>Starting I18nLog example...</messagebody>
<messagedetail></messagedetail>
<cause></cause>
<action></action>
</logmessage>
<logmessage
messageid="600001"
method="testArgs(String name,int cnt)"
severity="debug"
>
<messagebody>Class {0} started with {1,number} arguments.</messagebody>
<messagedetail></messagedetail>
<cause></cause>
<action></action>
</logmessage>
<logmessage
messageid="600002"
method="logTrace(Throwable t)"
severity="error"
stacktrace="true"
>
<messagebody>This message is followed by a trace</messagebody>
<messagedetail></messagedetail>
<cause></cause>
<action></action>
</logmessage>
<logmessage
messageid="600003"
method="logNoTrace(Throwable t)"
severity="warning"
stacktrace="false"
>
<messagebody>This message is not followed by a trace, but we can insert its text : {0}</messagebody>
<messagedetail></messagedetail>
<cause></cause>
<action></action>
</logmessage>
<logmessage
messageid="600004"
method="getId()"
severity="info"
>
<messagebody>This message's id will be in the next message</messagebody>
<messagedetail>A message can contain additional detailed information.</messagedetail>
<cause>This message is displayed on purpose</cause>
<action>Nothing to do, the example is working</action>
</logmessage>
<logmessage
messageid="600005"
method="showId(String id)"
severity="info"
>
<messagebody>The previous message logged had message id {0}</messagebody>
<messagedetail></messagedetail>
<cause></cause>
<action></action>
</logmessage>
</message_catalog>
例D-2は、weblogic.i18ngenが生成した、これに対応するJavaソース・コードを示しています。
例D-2 生成されたLoggerクラスの例
package examples.i18n.logging;
import weblogic.logging.MessageLogger;
import weblogic.logging.Loggable;
import java.util.MissingResourceException;
public class I18nLogLogger
{
/**
* Starting I18nLog example...
* @exclude
*
* messageid: 600000
* severity: info
*/
public static String logEntry() {
Object [] args = { };
MessageLogger.log(
"600000",
args,
"examples.i18n.logging.I18nLogLogLocalizer");
return "600000";
}
public static Loggable logEntryLoggable() throws MissingResourceException {
Object[] args = { };
return new Loggable("600000", args);
}
/**
* Class {0} started with {1,number} arguments.
* @exclude
*
* messageid: 600001
* severity: debug
*/
public static String testArgs(String arg0, int arg1) {
Object [] args = { arg0, new Integer(arg1) };
MessageLogger.log(
"600001",
args,
"examples.i18n.logging.I18nLogLogLocalizer");
return "600001";
}
public static Loggable testArgsLoggable(String arg0, int arg1) throws MissingResourceException {
Object[] args = { arg0, new Integer(arg1) };
return new Loggable("600001", args);
}
/**
* This message is followed by a trace
* @exclude
*
* messageid: 600002
* severity: error
*/
public static String logTrace(Throwable arg0) {
Object [] args = { arg0 };
MessageLogger.log(
"600002",
args,
"examples.i18n.logging.I18nLogLogLocalizer");
return "600002";
}
public static Loggable logTraceLoggable(Throwable arg0) throws MissingResourceException {
Object[] args = { arg0 };
return new Loggable("600002", args);
}
/**
* This message is not followed by a trace, but we can insert its text : {0}
* @exclude
*
* messageid: 600003
* severity: warning
*/
public static String logNoTrace(Throwable arg0) {
Object [] args = { arg0 };
MessageLogger.log(
"600003",
args,
"examples.i18n.logging.I18nLogLogLocalizer");
return "600003";
}
public static Loggable logNoTraceLoggable(Throwable arg0) throws MissingResourceException {
Object[] args = { arg0 };
return new Loggable("600003", args);
}
/**
* This message's id will be in the next message
* @exclude
*
* messageid: 600004
* severity: info
*/
public static String getId() {
Object [] args = { };
MessageLogger.log(
"600004",
args,
"examples.i18n.logging.I18nLogLogLocalizer");
return "600004";
}
public static Loggable getIdLoggable() throws MissingResourceException {
Object[] args = { };
return new Loggable("600004", args);
}
/**
* The previous message logged had message id {0}
* @exclude
*
* messageid: 600005
* severity: info
*/
public static String showId(String arg0) {
Object [] args = { arg0 };
MessageLogger.log(
"600005",
args,
"examples.i18n.logging.I18nLogLogLocalizer");
return "600005";
}
public static Loggable showIdLoggable(String arg0) throws MissingResourceException {
Object[] args = { arg0 };
return new Loggable("600005", args);
}
}
例D-3は、weblogic.i18nLog(国際化(I18n)ロギング・インタフェース)を使用するサンプル・アプリケーションを示しています。この例では、通知メッセージがログとして記録されます。
例D-3 i18nLogを使用するアプリケーション例
package examples.i18n.logging;
import java.util.Locale;
import weblogic.i18n.Localizer;
import weblogic.i18ntools.L10nLookup;
import weblogic.logging.Loggable;
/**
* This example shows how to use the internationalized (I18n) logging interfaces.
* <p>
* usage: java examples.i18n.logging.I18nLog
* <p>
* Build procedure: run bld.sh (UNIX) or bld.cmd (NT). These scripts
* process the I18nLog.xml catalog, producing the logging class,
* <tt>examples.i18n.logging.I18nLogLogger</tt>. This class contains static
* methods for logging messages to the WLS server log. The methods
* and arguments are defined in the I18nLog.xml catalog. This example also
* uses a simple message catalog, I18nSimple.xml.
*/
public class I18nLog {
public I18nLog() {}
public static void main(String[] argv) {
/**
* This call just logs an info message. There are no arguments defined
* for this method.
*
* This also shows how to use the Loggable form of the method.
*/
Loggable ll = I18nLogLogger.logEntryLoggable();
ll.log();
System.out.println(ll.getMessage());
/**
* Here's an example of a message including a variety
* of arguments.
*/
I18nLogLogger.testArgs(I18nLog.class.getName(),argv.length);
/**
* If a Throwable is passed then it will result in a stack trace
* being logged along with the method by default.
*/
Throwable t = new Throwable("Test with stack trace");
I18nLogLogger.logTrace(t);
/**
* Messages can optionally be defined to not log a stack trace.
*/
I18nLogLogger.logNoTrace(t);
/**
* The logger methods return the message id for applications
* that want to do more than just log these messages.
*/
String messageId = I18nLogLogger.getId();
I18nLogLogger.showId(messageId);
/**
* The message id can be used to obtain the different attributes
* of a message. The L10nLookup object provides access to the catalogs
* via Localizer classes. Localizers provide the access to individual
* messages. Each log message catalog has two Localizers: one for
* general message information and one for the detailed attributes.
*
* The basic Localizer provides access to catalog information:
* Version
* L10n Package - package for catalog data
* I18n Package - package for Logger methods
* Subsystem - catalog subsystem
* For each message it also provides:
* Severity: debug, info, warning, error
* Message Body - the message text
* Stack option - whether to log a stack trace
*
* First get to the L10nLookup properties, then use them to get the
* Localizers for the message.
*/
L10nLookup l10n = L10nLookup.getL10n();
/**
* This returns the basic Localizer (arg 3 = false)
*/
Localizer lcl = l10n.getLocalizer(messageId,Locale.getDefault(),false);
/**
* This returns the detailed Localizer (arg 3 = true)
*/
Localizer lclDetail = l10n.getLocalizer(messageId,Locale.getDefault(),true);
/**
* Use this appplication's simple message catalog to display the
* log message catalog information
*/
I18nSimpleTextFormatter fmt = new I18nSimpleTextFormatter();
System.out.println(fmt.version(messageId,lcl.getVersion()));
System.out.println(fmt.l10nPackage(messageId,lcl.getL10nPackage()));
System.out.println(fmt.i18nPackage(messageId,lcl.getI18nPackage()));
System.out.println(fmt.subsystem(messageId,lcl.getSubSystem()));
System.out.println(fmt.severity(messageId,lcl.getSeverity(messageId)));
System.out.println(fmt.body(messageId,lcl.getBody(messageId)));
System.out.println(fmt.stack(messageId,lcl.getStackTrace(messageId)));
/**
* Now for the detailed information.
*/
System.out.println(fmt.detail(messageId,lclDetail.getDetail(messageId)));
System.out.println(fmt.cause(messageId,lclDetail.getCause(messageId)));
System.out.println(fmt.action(messageId,lclDetail.getAction(messageId)));
}
}
