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JAXX Runtime api
There is a newer version: 3.1.5
package org.nuiton.jaxx.runtime.application;

/*-
 * #%L
 * JAXX :: Runtime
 * %%
 * Copyright (C) 2008 - 2024 Code Lutin, Ultreia.io
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 *
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.io.Closeable;
import java.util.Objects;

/**
 * Created by tchemit on 28/01/2018.
 *
 * @author Tony Chemit - [email protected]
 */
public abstract class ApplicationContextComponent, O> {

    private final Class type;
    private final String name;
    private O instance;

    protected ApplicationContextComponent(Class type, String name) {
        this.type = Objects.requireNonNull(type);
        this.name = Objects.requireNonNull(name);
    }

    protected ApplicationContextComponent(Class type) {
        this(Objects.requireNonNull(type), type.getSimpleName());
    }

    protected abstract O load(Context context, Config config);

    public final Class getType() {
        return type;
    }

    public final String getName() {
        return name;
    }

    public final boolean isInit() {
        return instance != null;
    }

    public final O get() {
        return instance;
    }

    public final O remove() {
        O value = get();
        if (value != null) {
            try {
                if (value instanceof Closeable) {
                    try {
                        ((Closeable) value).close();
                    } catch (Exception e) {
                        throw new RuntimeException("Could not close " + this, e);
                    }
                }
            } finally {
                this.instance = null;
            }
        }
        return value;
    }

    @Override
    public final boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        ApplicationContextComponent that = (ApplicationContextComponent) o;
        return Objects.equals(name, that.name) &&
                Objects.equals(type, that.type);
    }

    @Override
    public final int hashCode() {
        return Objects.hash(name, type);
    }

    public final void set(Context context, Config config) {
        set(load(context, config));
    }

    public final void set(O instance) {
        if (this.instance != null) {
            throw new IllegalStateException(String.format("%s has already a value: %s", this, this.instance));
        }
        this.instance = Objects.requireNonNull(instance);
    }
}