com.ikanow.aleph2.logging.utils.Log4JUtils.java Source code

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Here is the source code for com.ikanow.aleph2.logging.utils.Log4JUtils.java

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/*******************************************************************************
 * Copyright 2016, The IKANOW Open Source Project.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.ikanow.aleph2.logging.utils;

import java.text.SimpleDateFormat;
import java.util.Collections;
import java.util.Date;
import java.util.Map;
import java.util.Optional;

import org.apache.logging.log4j.Level;

import com.fasterxml.jackson.databind.JsonNode;

/**
 * @author Burch
 *
 */
public class Log4JUtils {
    private static SimpleDateFormat date_format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    private static String message_format = "%s [%s] %s %s:%s %s"; // <date> [<thread.name>] <level> <class[1]:line> <message> <other_fields=other_values>
    private static String field_format = " %s=%s";

    public static String getLog4JMessage(final JsonNode logObject, final Level level, final StackTraceElement stack,
            final String date_field, final Map<String, Object> map, final String hostname) {
        StringBuilder sb = new StringBuilder();
        final String c = stack.getClassName().substring(stack.getClassName().lastIndexOf(".") + 1);
        final String l = Integer.toString(stack.getLineNumber());
        final String thread = Thread.currentThread().getName().isEmpty()
                ? Long.toString(Thread.currentThread().getId())
                : Thread.currentThread().getName();
        sb.append(String.format(message_format, date_format.format(new Date(logObject.get(date_field).asLong())),
                thread, level.name(), c, l, logObject.get("message").asText()));
        sb.append(String.format(field_format, "bucket", logObject.get("bucket").asText()));
        sb.append(String.format(field_format, "hostname", hostname));
        sb.append(String.format(field_format, "subsystem", logObject.get("subsystem").asText()));
        sb.append(String.format(field_format, "command", logObject.get("command").asText()));
        Optional.ofNullable(map).orElse(Collections.emptyMap()).entrySet().stream()
                .forEach(e -> sb.append(String.format(field_format, e.getKey(), e.getValue())));
        return sb.toString();
    }
}