59 lines
1.9 KiB
Java
59 lines
1.9 KiB
Java
/*
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* This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
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* Copyright (C) 2016-2024 ViaVersion and contributors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.storage;
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import com.viaversion.viaversion.api.connection.StorableObject;
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import java.util.Arrays;
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import java.util.BitSet;
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public final class AcknowledgedMessagesStorage implements StorableObject {
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private static final int MAX_HISTORY = 20;
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private final boolean[] trackedMessages = new boolean[MAX_HISTORY];
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private int offset;
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private int tail;
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private byte[] lastMessage;
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public boolean add(final byte[] message) {
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if (Arrays.equals(message, lastMessage)) {
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return false;
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}
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this.lastMessage = message;
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this.offset++;
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this.trackedMessages[this.tail] = true;
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this.tail = (this.tail + 1) % MAX_HISTORY;
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return true;
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}
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public BitSet toAck() {
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final BitSet acks = new BitSet(MAX_HISTORY);
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for (int i = 0; i < MAX_HISTORY; i++) {
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final int messageIndex = (this.tail + i) % MAX_HISTORY;
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acks.set(i, this.trackedMessages[messageIndex]);
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}
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return acks;
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}
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public int offset() {
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return this.offset;
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}
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public void clearOffset() {
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this.offset = 0;
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}
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}
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