Examples of org.apache.logging.log4j.message.Message

Package org.apache.logging.log4j.message

Examples of org.apache.logging.log4j.message.Message

org.apache.logging.log4j.message.Message
An interface for various Message implementations that can be logged. Messages can act as wrappers around Objects so that user can have control over converting Objects to Strings when necessary without requiring complicated formatters and as a way to manipulate the message based on information available at runtime such as the locale of the system.
Note: Message objects should not be considered to be thread safe nor should they be assumed to be safely reusable even on the same thread. The logging system may provide information to the Message objects and the Messages might be queued for asynchronous delivery. Thus, any modifications to a Message object by an application should by avoided after the Message has been passed as a parameter on a Logger method.
@doubt Interfaces should rarely extend Serializable according to Effective Java 2nd Ed pg 291.(RG) That section also says "If a class or interface exists primarily to participate in a framework that requires all participants to implement Serializable, then it makes perfect sense for the class or interface to implement or extend Serializable". Such is the case here as the LogEvent must be Serializable.

        category.info("Hello, World");
        final List<LogEvent> list = appender.getEvents();
        int events = list.size();
        assertTrue("Number of events should be 1, was " + events, events == 1);
        LogEvent event = list.get(0);
        Message msg = event.getMessage();
        assertNotNull("No message", msg);
        assertTrue("Incorrect Message type", msg instanceof ObjectMessage);
        Object[] objects = msg.getParameters();
        assertTrue("Incorrect Object type", objects[0] instanceof String);
        appender.clear();
        category.log(Priority.INFO, "Hello, World");
        events = list.size();
        assertTrue("Number of events should be 1, was " + events, events == 1);
        event = list.get(0);
        msg = event.getMessage();
        assertNotNull("No message", msg);
        assertTrue("Incorrect Message type", msg instanceof ObjectMessage);
        objects = msg.getParameters();
        assertTrue("Incorrect Object type", objects[0] instanceof String);
        appender.clear();
    }

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                    }
                }
            }
        }
        final String guid =  UUIDUtil.getTimeBasedUUID().toString();
        final Message message = event.getMessage();
        if (message instanceof MapMessage) {
            // Add the guid to the Map so that it can be included in the Layout.
            ((MapMessage) message).put(GUID, guid);
            if (message instanceof StructuredDataMessage) {
                addStructuredData(eventPrefix, headers, (StructuredDataMessage) message);

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     * @param params  parameters to the message.
     */
    @Override
    public void debug(final Marker marker, final String message, final Object... params) {
        if (isEnabled(Level.DEBUG, marker, message, params)) {
            final Message msg = messageFactory.newMessage(message, params);
            log(marker, FQCN, Level.DEBUG, msg, msg.getThrowable());
        }
    }

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     * @param params  parameters to the message.
     */
    @Override
    public void debug(final String message, final Object... params) {
        if (isEnabled(Level.DEBUG, null, message, params)) {
            final Message msg = messageFactory.newMessage(message, params);
            log(null, FQCN, Level.DEBUG, msg, msg.getThrowable());
        }
    }

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     * @param params  parameters to the message.
     */
    @Override
    public void error(final Marker marker, final String message, final Object... params) {
        if (isEnabled(Level.ERROR, marker, message, params)) {
            final Message msg = messageFactory.newMessage(message, params);
            log(marker, FQCN, Level.ERROR, msg, msg.getThrowable());
        }
    }

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     * @param params  parameters to the message.
     */
    @Override
    public void error(final String message, final Object... params) {
        if (isEnabled(Level.ERROR, null, message, params)) {
            final Message msg = messageFactory.newMessage(message, params);
            log(null, FQCN, Level.ERROR, msg, msg.getThrowable());
        }
    }

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     * @param params  parameters to the message.
     */
    @Override
    public void fatal(final Marker marker, final String message, final Object... params) {
        if (isEnabled(Level.FATAL, marker, message, params)) {
            final Message msg = messageFactory.newMessage(message, params);
            log(marker, FQCN, Level.FATAL, msg, msg.getThrowable());
        }
    }

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     * @param params  parameters to the message.
     */
    @Override
    public void fatal(final String message, final Object... params) {
        if (isEnabled(Level.FATAL, null, message, params)) {
            final Message msg = messageFactory.newMessage(message, params);
            log(null, FQCN, Level.FATAL, msg, msg.getThrowable());
        }
    }

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     * @param params  parameters to the message.
     */
    @Override
    public void info(final Marker marker, final String message, final Object... params) {
        if (isEnabled(Level.INFO, marker, message, params)) {
            final Message msg = messageFactory.newMessage(message, params);
            log(marker, FQCN, Level.INFO, msg, msg.getThrowable());
        }
    }

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     * @param params  parameters to the message.
     */
    @Override
    public void info(final String message, final Object... params) {
        if (isEnabled(Level.INFO, null, message, params)) {
            final Message msg = messageFactory.newMessage(message, params);
            log(null, FQCN, Level.INFO, msg, msg.getThrowable());
        }
    }

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