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.

        RingBufferLogEvent evt = new RingBufferLogEvent();
        String loggerName = null;
        Marker marker = null;
        String fqcn = null;
        Level level = null;
        Message data = new TimeMsg("", 567);
        Throwable t = null;
        Map<String, String> map = null;
        ContextStack contextStack = null;
        String threadName = null;
        StackTraceElement location = null;

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        RingBufferLogEvent evt = new RingBufferLogEvent();
        String loggerName = "logger.name";
        Marker marker = null;
        String fqcn = "f.q.c.n";
        Level level = Level.TRACE;
        Message data = new SimpleMessage("message");
        Throwable t = new InternalError("not a real error");
        Map<String, String> map = null;
        ContextStack contextStack = null;
        String threadName = "main";
        StackTraceElement location = null;

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        RingBufferLogEvent evt = new RingBufferLogEvent();
        String loggerName = "logger.name";
        Marker marker = MarkerManager.getMarker("marked man");
        String fqcn = "f.q.c.n";
        Level level = Level.TRACE;
        Message data = new SimpleMessage("message");
        Throwable t = new InternalError("not a real error");
        Map<String, String> map = new HashMap<String, String>();
        map.put("key", "value");
        ContextStack contextStack = new MutableThreadContextStack(Arrays.asList("a", "b"));
        String threadName = "main";

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        return Result.NEUTRAL;
    }


    @Override
    public Result filter(final LogEvent event) {
        final Message msg = event.getMessage();
        if (msg instanceof StructuredDataMessage) {
            return filter((StructuredDataMessage) msg);
        }
        return super.filter(event);
    }

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        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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     * @param source a logging event that may be returned or
     * used to create a new logging event.
     * @return The LogEvent after rewriting.
     */
    public LogEvent rewrite(final LogEvent source) {
        final Message msg = source.getMessage();
        if (msg == null || !(msg instanceof MapMessage)) {
            return source;
        }


        final Map<String, String> newMap = new HashMap<String, String>(((MapMessage) msg).getData());

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        return Result.NEUTRAL;
    }


    @Override
    public Result filter(final LogEvent event) {
        final Message msg = event.getMessage();
        if (msg instanceof MapMessage) {
            return filter(((MapMessage) msg).getData()) ? onMatch : onMismatch;
        }
        return Result.NEUTRAL;
    }

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     *
     * @param event The LogEvent.
     * @return The RFC 5424 String representation of the LogEvent.
     */
    public String toSerializable(final LogEvent event) {
        final Message msg = event.getMessage();
        final boolean isStructured = msg instanceof StructuredDataMessage;
        final StringBuilder buf = new StringBuilder();


        buf.append("<");
        buf.append(Priority.getPriority(facility, event.getLevel()));
        buf.append(">1 ");
        buf.append(computeTimeStampString(event.getMillis()));
        buf.append(' ');
        buf.append(localHostName);
        buf.append(' ');
        if (appName != null) {
            buf.append(appName);
        } else if (configName != null) {
            buf.append(configName);
        } else {
            buf.append("-");
        }
        buf.append(" ");
        buf.append(getProcId());
        buf.append(" ");
        final String type = isStructured ? ((StructuredDataMessage) msg).getType() : null;
        if (type != null) {
            buf.append(type);
        } else if (messageId != null) {
            buf.append(messageId);
        } else {
            buf.append("-");
        }
        buf.append(" ");
        if (isStructured || includeMDC) {
            StructuredDataId id = null;
            String text;
            if (isStructured) {
                final StructuredDataMessage data = (StructuredDataMessage) msg;
                final Map<String, String> map = data.getData();
                id = data.getId();
                formatStructuredElement(id, eventPrefix, map, buf, noopChecker);
                text = data.getFormat();
            } else {
                text = msg.getFormattedMessage();
            }
            if (includeMDC) {
                Map<String, String> map = event.getContextMap();
                if (mdcRequired != null) {
                    checkRequired(map);
                }
                final int ein = id == null || id.getEnterpriseNumber() < 0 ?
                    enterpriseNumber : id.getEnterpriseNumber();
                final StructuredDataId mdcSDID = new StructuredDataId(mdcId, ein, null, null);
                formatStructuredElement(mdcSDID, mdcPrefix, map, buf, checker);
            }
            if (text != null && text.length() > 0) {
                buf.append(" ").append(escapeNewlines(text, escapeNewLine));
            }
        } else {
            buf.append("- ");
            buf.append(escapeNewlines(msg.getFormattedMessage(), escapeNewLine));
        }
        if (formatters != null && event.getThrown() != null) {
            final StringBuilder exception = new StringBuilder("\n");
            for (final PatternFormatter formatter : formatters) {
                formatter.format(event, exception);

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    @Test
    public void createObjects() throws Exception {
        Timer timer = new Timer("NewObject", COUNT);
        timer.start();
        Message msg;
        for (int i = 0; i < COUNT; ++i) {
            msg = new StringFormattedMessage("Hello %1", i);
        }
        timer.stop();
        System.out.println(timer.toString());

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        buf.append(Transform.escapeTags(String.valueOf(event.getLevel())));
        buf.append("\" thread=\"");
        buf.append(Transform.escapeTags(event.getThreadName()));
        buf.append("\">\r\n");


        final Message msg = event.getMessage();
        if (msg != null) {
            boolean xmlSupported = false;
            if (msg instanceof MultiformatMessage) {
                final String[] formats = ((MultiformatMessage) msg).getFormats();
                for (final String format : formats) {

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