zdm/envoy
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Migrated Config, ConfigItem and EnvoyLog from envoy-client

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This commit is contained in:
Kai S. K. Engelbart 2020-03-02 19:16:28 +01:00
parent 84a7b41d65
commit 26c947cbce
3 changed files with 288 additions and 0 deletions
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78
src/main/java/envoy/data/Config.java Normal file
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package envoy.data;
import java.util.*;
import envoy.exception.EnvoyException;
/**
* Manages all application settings that are set during application startup by
* either loading them from the {@link Properties} file
* {@code client.properties} or parsing them from the command line arguments of
* the application.<br>
* <br>
* Project: <strong>envoy-client</strong><br>
* File: <strong>Config.java</strong><br>
* Created: <strong>12 Oct 2019</strong><br>
*
* @author Kai S. K. Engelbart
* @since Envoy Common v0.1-beta
*/
public class Config {
protected Map<String, ConfigItem<?>> items = new HashMap<>();
/**
* Parses config items from a properties object.
*
* @param properties the properties object to parse
* @since Envoy Common v0.1-beta
*/
public void load(Properties properties) {
items.entrySet()
.stream()
.filter(e -> properties.containsKey(e.getKey()))
.forEach(e -> e.getValue().parse(properties.getProperty(e.getKey())));
}
/**
* Parses config items from an array of command line arguments.
*
* @param args the command line arguments to parse
* @throws EnvoyException if the command line arguments contain an unknown token
* @since Envoy Common v0.1-beta
*/
public void load(String[] args) throws EnvoyException {
for (int i = 0; i < args.length; i++)
for (ConfigItem<?> item : items.values())
if (args[i].startsWith("--")) {
if (args[i].length() == 2) throw new EnvoyException("Malformed command line argument at position " + i);
final String commandLong = args[i].substring(2);
if (item.getCommandLong().equals(commandLong)) {
item.parse(args[++i]);
break;
}
} else if (args[i].startsWith("-")) {
if (args[i].length() == 1) throw new EnvoyException("Malformed command line argument at position " + i);
final String commandShort = args[i].substring(1);
if (item.getCommandShort().equals(commandShort)) {
item.parse(args[++i]);
break;
}
} else throw new EnvoyException("Malformed command line argument at position " + i);
}
/**
* @return {@code true} if all mandatory config items are initialized
* @since Envoy Common v0.1-beta
*/
public boolean isInitialized() {
return items.values().stream().filter(ConfigItem::isMandatory).map(ConfigItem::get).noneMatch(Objects::isNull);
}
/**
* @param name the name of the config item to return
* @return the config item with the specified name
* @since Envoy Common v0.1-beta
*/
public ConfigItem<?> get(String name) { return items.get(name); }
}

92
src/main/java/envoy/data/ConfigItem.java Normal file
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package envoy.data;
import java.util.function.Function;
/**
* Contains a single {@link Config} value as well as the corresponding command
* line arguments and its default value.<br>
* <br>
* Project: <strong>envoy-clientChess</strong><br>
* File: <strong>ConfigItem.javaEvent.java</strong><br>
* Created: <strong>21.12.2019</strong><br>
*
* @author Kai S. K. Engelbart
* @param <T> the type of the config item's value
* @since Envoy Common v0.1-beta
*/
public class ConfigItem<T> {
private final String commandLong, commandShort;
private final Function<String, T> parseFunction;
private final boolean mandatory;
private T value;
/**
* Initializes a {@link ConfigItem}.
*
* @param commandLong the long command line argument to set this value
* @param commandShort the short command line argument to set this value
* @param parseFunction the {@code Function<String, T>} that parses the value
* from a string
* @param defaultValue the optional default value to set before parsing
* @param mandatory indicated that this config item must be initialized with
* a non-null value
* @since Envoy Common v0.1-beta
*/
public ConfigItem(String commandLong, String commandShort, Function<String, T> parseFunction, T defaultValue, boolean mandatory) {
this.commandLong = commandLong;
this.commandShort = commandShort;
this.parseFunction = parseFunction;
this.mandatory = mandatory;
value = defaultValue;
}
/**
* Initializes an optional {@link ConfigItem} without a default value.
*
* @param commandLong the long command line argument to set this value
* @param commandShort the short command line argument to set this value
* @param parseFunction the {@code Function<String, T>} that parses the value
* from a string
* @since Envoy Common v0.1-beta
*/
public ConfigItem(String commandLong, String commandShort, Function<String, T> parseFunction) {
this(commandLong, commandShort, parseFunction, null, false);
}
/**
* Parses this {@ConfigItem}'s value from a string.
*
* @param input the string to parse from
* @since Envoy Common v0.1-beta
*/
public void parse(String input) { value = parseFunction.apply(input); }
/**
* @return The long command line argument to set the value of this
* {@link ConfigItem}
* @since Envoy Common v0.1-beta
*/
public String getCommandLong() { return commandLong; }
/**
* @return The short command line argument to set the value of this
* {@link ConfigItem}
* @since Envoy Common v0.1-beta
*/
public String getCommandShort() { return commandShort; }
/**
* @return the value of this {@link ConfigItem}
* @since Envoy Common v0.1-beta
*/
public T get() { return value; }
/**
* @return {@code true} if this {@link ConfigItem} is mandatory for successful
* application initialization
* @since Envoy Common v0.1-beta
*/
public boolean isMandatory() { return mandatory; }
}

118
src/main/java/envoy/util/EnvoyLog.java Normal file
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package envoy.util;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.*;
import envoy.data.Config;
/**
* Configures the {@link java.util.logging} API to output the log into the
* console and a log file.<br>
* <br>
* Call the {@link EnvoyLog#attach(String)} method to configure a part of the
* logger hierarchy.<br>
* <br>
* Project: <strong>envoy-client</strong><br>
* File: <strong>EnvoyLogger.java</strong><br>
* Created: <strong>14 Dec 2019</strong><br>
*
* @author Leon Hofmeister
* @author Kai S. K. Engelbart
* @since Envoy Common v0.1-beta
*/
public class EnvoyLog {
private static FileHandler fileHandler;
private static StreamHandler consoleHandler;
private static boolean initialized;
private EnvoyLog() {}
/**
* Initializes logging. Call this method before calling the
* {@link EnvoyLog#attach(String)} method.
*
* @param config the config providing the console and log file barriers
* @since Envoy Common v0.1-beta
*/
public static void initialize(Config config) {
if (initialized) throw new IllegalStateException("EnvoyLog is already initialized");
// Remove default console handler
LogManager.getLogManager().reset();
// Configure log file
File logFile = new File((File) config.get("homeDirectory").get(),
"log/envoy_user_" + new SimpleDateFormat("yyyy-MM-dd--hh-mm-mm").format(new Date()) + ".log");
logFile.getParentFile().mkdirs();
// Configure formatting
System.setProperty("java.util.logging.SimpleFormatter.format", "[%1$tF %1$tT] [%4$-7s] [%3$s] %5$s %n");
SimpleFormatter formatter = new SimpleFormatter();
try {
fileHandler = new FileHandler(logFile.getAbsolutePath());
fileHandler.setLevel((Level) config.get("fileLevelBarrier").get());
fileHandler.setFormatter(formatter);
} catch (SecurityException | IOException e) {
e.printStackTrace();
}
consoleHandler = new StreamHandler(System.out, formatter);
consoleHandler.setLevel((Level) config.get("consoleLevelBarrier").get());
consoleHandler.setFormatter(formatter);
initialized = true;
}
/**
* Configures all loggers that are contained within the hierarchy of a specific
* path to use the console and file handlers.
*
* @param path the path to the loggers to configure
* @since Envoy Common v0.1-beta
*/
public static void attach(String path) {
if (!initialized) throw new IllegalStateException("EnvoyLog is not initialized");
// Get root logger
Logger logger = Logger.getLogger(path);
// Add handlers
if (fileHandler != null) logger.addHandler(fileHandler);
logger.addHandler(consoleHandler);
// Delegate logger level filtering to the handlers
logger.setLevel(Level.ALL);
}
/**
* Creates a logger for a specified class, which output will be displayed inside
* the console and written to the log file.
*
* @param logClass the class in which the logger is used
* @return the created logger
* @since Envoy Common v0.1-beta
*/
public static Logger getLogger(Class<?> logClass) { return Logger.getLogger(logClass.getCanonicalName()); }
/**
* Defines the logger level required for a record to be written to the log file.
*
* @param fileLevelBarrier the log file level
* @since Envoy Common v0.1-beta
*/
public static void setFileLevelBarrier(Level fileLevelBarrier) { if (fileHandler != null) fileHandler.setLevel(fileLevelBarrier); }
/**
* Defines the logger level required for a record to be written to the console.
*
* @param consoleLevelBarrier the console logger level
* @since Envoy Common v0.1-beta
*/
public static void setConsoleLevelBarrier(Level consoleLevelBarrier) {
if (consoleHandler != null) consoleHandler.setLevel(consoleLevelBarrier);
}
}