建立简单Log数据模型和输出模型

- 基础 Log 模型，记录了消息和时间戳，线程，等级，调用堆栈跟踪
  - 同时消息以 Message 封装
- 输出器接口用以Log对象输出，和基于System.out.println的控制台输出器——包含预定的格式规范器
- 基础的 Logger，可以储存一些输出器，并根据信息字符串创建简单的消息对象分发到输出器中

src/main/java/cc/sukazyo/messiva/Logger.java

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+package cc.sukazyo.messiva;
+
+import cc.sukazyo.messiva.appender.IAppender;
+import cc.sukazyo.messiva.log.Log;
+import cc.sukazyo.messiva.log.LogLevel;
+import cc.sukazyo.messiva.log.Message;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class Logger {
+	
+	public final List<IAppender> appends = new ArrayList<>();
+	
+	public Logger () {}
+	
+	public Logger (IAppender... appends) {
+		this.appends.addAll(Arrays.asList(appends));
+	}
+	
+	public void trace (String message) {
+		pushToAllAppender(new Log(1, new Message(message), LogLevel.TRACE));
+	}
+	
+	public void info (String message) {
+		pushToAllAppender(new Log(1, new Message(message), LogLevel.INFO));
+	}
+	
+	public void warn (String message) {
+		pushToAllAppender(new Log(1, new Message(message), LogLevel.WARN));
+	}
+	
+	public void warning (String message) {
+		pushToAllAppender(new Log(1, new Message(message), LogLevel.WARN));
+	}
+	
+	public void error (String message) {
+		pushToAllAppender(new Log(1, new Message(message), LogLevel.ERROR));
+	}
+	
+	public void fatal (String message) {
+		pushToAllAppender(new Log(1, new Message(message), LogLevel.FATAL));
+	}
+	
+	private void pushToAllAppender (Log log) {
+		for (IAppender appender : appends) {
+			appender.pushLog(log);
+		}
+	}
+	
+}

src/main/java/cc/sukazyo/messiva/appender/ConsoleAppender.java

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+package cc.sukazyo.messiva.appender;
+
+import cc.sukazyo.messiva.log.Log;
+import cc.sukazyo.messiva.utils.StringUtils;
+
+import java.util.concurrent.locks.ReentrantLock;
+
+public class ConsoleAppender implements IAppender {
+	
+	private final ReentrantLock syncLock = new ReentrantLock();
+	
+//	private final AppendDaemon DAEMON;
+//	private static class AppendDaemon extends Thread {
+//		public AppendDaemon () { this.setName("console-appender-daemon::" + UUID.randomUUID()); }
+//		@Override public void run () {
+//
+//		}
+//	}
+//
+	public ConsoleAppender() {
+//		DAEMON = new AppendDaemon();
+//		DAEMON.start();
+	}
+	
+	@Override
+	public void pushLog (Log log) {
+		syncLock.lock();
+		System.out.println(formatMessage(log));
+		syncLock.unlock();
+	}
+	
+	private static String formatMessage (Log log) {
+		final StringBuilder message = new StringBuilder();
+		message.append('[').append(log.timestamp)
+				.append("][").append(log.thread.getName())
+				.append("]");
+		final String promptNewline = StringUtils.repeatChar('\'', message.length());
+		message.append('[').append(log.level.tag).append(']').append(log.message.message[0]);
+		for (int i = 1; i < log.message.message.length; i++) {
+			message.append('\n').append(promptNewline)
+					.append('[').append(log.level.tag).append(']').append(log.message.message[i]);
+		}
+		return message.toString();
+	}
+	
+}

src/main/java/cc/sukazyo/messiva/appender/IAppender.java

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+package cc.sukazyo.messiva.appender;
+
+import cc.sukazyo.messiva.log.Log;
+
+public interface IAppender {
+	
+	void pushLog (Log log);
+	
+}

src/main/java/cc/sukazyo/messiva/log/Log.java

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+package cc.sukazyo.messiva.log;
+
+import cc.sukazyo.messiva.utils.StackUtils;
+
+public class Log {
+	
+	public final Message message;
+	public final LogLevel level;
+	public final long timestamp;
+	public final Thread thread;
+	public final StackTraceElement[] stackTrace;
+	
+	public Log (Message message, LogLevel level, Thread thread, long timestamp, StackTraceElement[] stackTrace) {
+		this.message = message;
+		this.level = level;
+		this.thread = thread;
+		this.timestamp = timestamp;
+		this.stackTrace = stackTrace;
+	}
+	
+	public Log (int stackOffset, Message message, LogLevel level, Thread thread, long timestamp) {
+		this(message, level, thread, timestamp, StackUtils.getStackTrace(stackOffset+1));
+	}
+	
+	public Log (Message message, LogLevel level, Thread thread, long timestamp) {
+		this(1, message, level, thread, timestamp);
+	}
+	
+	public Log (int stackOffset, Message message, LogLevel level, Thread thread) {
+		this(stackOffset+1, message, level, thread, System.currentTimeMillis());
+	}
+	
+	public Log (Message message, LogLevel level, Thread thread) {
+		this(1, message, level, thread);
+	}
+	
+	public Log (int stackOffset, Message message, LogLevel level) {
+		this(stackOffset+1, message, level, Thread.currentThread());
+	}
+	
+	public Log (Message message, LogLevel level) {
+		this(1, message, level);
+	}
+	
+}

src/main/java/cc/sukazyo/messiva/log/LogLevel.java

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+package cc.sukazyo.messiva.log;
+
+public enum LogLevel {
+	
+	TRACE(-1f, "TRAC"),
+	INFO(0f, "INFO"),
+	WARN(0.5f, "WARN"),
+	ERROR(1f, "ERRO"),
+	FATAL(10f, "FTAL");
+	
+	public final float level;
+	public final String tag;
+	
+	LogLevel (float level, String tag) {
+		this.level = level;
+		this.tag = tag;
+	}
+	
+}

src/main/java/cc/sukazyo/messiva/log/Message.java

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+package cc.sukazyo.messiva.log;
+
+public class Message {
+	
+	public final String[] message;
+	
+	public Message(String message) {
+		this.message = message.split("\n");
+	}
+	
+}

src/main/java/cc/sukazyo/messiva/utils/StackUtils.java

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+package cc.sukazyo.messiva.utils;
+
+import java.util.Arrays;
+
+public class StackUtils {
+	
+	public static StackTraceElement[] getStackTrace (int offset) {
+		offset += 2;
+		StackTraceElement[] origins = Thread.currentThread().getStackTrace();
+		origins = Arrays.copyOfRange(origins, offset, origins.length);
+		return origins;
+	}
+	
+}

src/main/java/cc/sukazyo/messiva/utils/StringUtils.java

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+package cc.sukazyo.messiva.utils;
+
+import javax.annotation.Nonnull;
+import java.util.Arrays;
+
+public class StringUtils {
+	
+	@Nonnull
+	public static String repeatChar (char c, int i) {
+		final char[] chars = new char[i];
+		Arrays.fill(chars, c);
+		return new String(chars);
+	}
+	
+}