105 lines
2.6 KiB
Java
105 lines
2.6 KiB
Java
package fr.pandacube.lib.cli;
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import fr.pandacube.lib.cli.commands.CommandAdmin;
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import fr.pandacube.lib.cli.commands.CommandStop;
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import fr.pandacube.lib.util.Log;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.logging.Logger;
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/**
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* Main class of a CLI application.
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*/
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public abstract class CLIApplication {
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private static CLIApplication instance;
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public static CLIApplication getInstance() {
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return instance;
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}
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public final CLI cli;
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protected CLIApplication() {
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instance = this;
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CLI tmpCLI = null;
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try {
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tmpCLI = new CLI();
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Log.setLogger(tmpCLI.getLogger());
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} catch (Throwable t) {
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System.err.println("Unable to start application " + getName() + " version " + getClass().getPackage().getImplementationVersion());
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t.printStackTrace();
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System.exit(1);
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}
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cli = tmpCLI;
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try {
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Log.info("Starting " + getName() + " version " + getClass().getPackage().getImplementationVersion());
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start();
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new CommandAdmin();
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new CommandStop();
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Runtime.getRuntime().addShutdownHook(new Thread(this::end));
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cli.start(); // actually starts the CLI thread
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Log.info("Application started.");
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} catch (Throwable t) {
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Log.severe("Unable to start application " + getName() + " version " + getClass().getPackage().getImplementationVersion(), t);
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}
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}
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public Logger getLogger() {
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return cli.getLogger();
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}
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private final Object stopLock = new Object();
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private final AtomicBoolean stopping = new AtomicBoolean(false);
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@SuppressWarnings("finally")
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public final void stop() {
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synchronized (stopLock) {
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synchronized (stopping) {
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if (stopping.get())
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return;
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stopping.set(true);
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}
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Log.info("Stopping " + getName() + " version " + getClass().getPackage().getImplementationVersion());
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try {
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end();
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} catch (Throwable t) {
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Log.severe("Error stopping application " + getName() + " version " + getClass().getPackage().getImplementationVersion(), t);
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} finally {
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Log.info("Bye bye.");
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System.exit(0);
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}
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}
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}
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public boolean isStopping() {
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return stopping.get();
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}
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public abstract String getName();
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protected abstract void start() throws Exception;
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public abstract void reload();
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protected abstract void end();
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}
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