org.diorite.impl.connection.packets.Packet.java Source code

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Here is the source code for org.diorite.impl.connection.packets.Packet.java

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016. Diorite (by Bartomiej Mazur (aka GotoFinal))
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package org.diorite.impl.connection.packets;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;

import org.diorite.impl.connection.CoreNetworkManager;
import org.diorite.utils.others.Dirtable;

import io.netty.buffer.Unpooled;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;

public abstract class Packet<T extends PacketListener> implements Dirtable {
    public static final int INITIAL_CAPACITY = 256;
    protected volatile byte[] data;
    protected volatile boolean dirty;

    public Packet() {
    }

    public Packet(final byte[] data) {
        this.data = data;
    }

    @Override
    public boolean isDirty() {
        return this.dirty;
    }

    @Override
    public boolean setDirty(final boolean dirty) {
        final boolean d = this.dirty;
        this.dirty = dirty;
        return d;
    }

    public abstract void readPacket(PacketDataSerializer data) throws IOException;

    public abstract void writeFields(PacketDataSerializer data) throws IOException;

    public abstract void handle(T listener);

    public synchronized byte[] preparePacket(final boolean force) throws IOException {
        if (force || (this.data == null)) {
            final PacketDataSerializer newData = new PacketDataSerializer(
                    Unpooled.buffer(this.getPacketData().size()));
            this.writeFields(newData);
            this.data = new byte[newData.readableBytes()];
            System.arraycopy(newData.array(), 0, this.data, 0, newData.readableBytes());
        }
        return this.data;
    }

    public void writePacket(final PacketDataSerializer data) throws IOException {
        byte[] tempData = this.data;
        if ((tempData == null) || this.dirty) {
            synchronized (this) {
                tempData = this.preparePacket(this.dirty);
                this.dirty = false;
            }
            if (tempData == null) {
                throw new IllegalStateException("Packet data isn't prepared after preparing!");
            }
        }
        data.writeBytes(tempData);
    }

    public byte[] getCachedData() {
        return this.data;
    }

    public void setCachedData(final byte[] data) {
        this.data = data;
    }

    public PacketClass getPacketData() {
        return getPacketData(this.getClass());
    }

    public void send(final CoreNetworkManager networkManager) {
        networkManager.sendPacket(this);
    }

    @SuppressWarnings("unchecked")
    public void send(final CoreNetworkManager networkManager,
            final GenericFutureListener<? extends Future<? super Void>> listener,
            final GenericFutureListener<? extends Future<? super Void>>... listeners) {
        networkManager.sendPacket(this, listener, listeners);
    }

    private static final Map<String, PacketClass> map = new HashMap<>(200);

    public static PacketClass getPacketData(@SuppressWarnings("rawtypes") final Class<? extends Packet> clazz) {
        PacketClass pc = map.get(clazz.getSimpleName());
        if (pc == null) {
            synchronized (map) {
                if (!clazz.isAnnotationPresent(PacketClass.class)) {
                    throw new IllegalArgumentException(
                            "To use this method, class must be annotated with PacketClass");
                }
                pc = clazz.getAnnotation(PacketClass.class);
                map.put(clazz.getSimpleName(), pc);
            }
        }
        return pc;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE).appendSuper(super.toString())
                .append("id", Integer.toHexString(this.getPacketData().id())).toString();
    }
}