feat(discord-rpc): improve the system

facades/PC/src/main/resources/logback.xml

@@ -50,4 +50,5 @@
   <logger name="com.snowplowanalytics" level="${logOverrideLevel:-error}" />
   <logger name="io.netty" level="${logOverrideLevel:-warn}" />
 
+  <logger name="com.jagrosh.discordipc" level="OFF"/>
 </configuration>

subsystems/DiscordRPC/src/main/java/org/terasology/engine/subsystem/discordrpc/DiscordRPCBuffer.java

@@ -0,0 +1,155 @@
+// Copyright 2020 The Terasology Foundation
+// SPDX-License-Identifier: Apache-2.0
+
+package org.terasology.engine.subsystem.discordrpc;
+
+import java.time.OffsetDateTime;
+
+/**
+ * A threaded-safe shared buffer used to store information for {@link DiscordRPCThread} to be processed as {@link com.jagrosh.discordipc.entities.RichPresence}
+ *
+ * It helps avoiding allocating unnecessary objects for the rich presence.
+ */
+public final class DiscordRPCBuffer {
+    private String details;
+    private String state;
+    private OffsetDateTime startTimestamp;
+    private int partySize;
+    private int partyMax;
+    private boolean changed;
+
+    public DiscordRPCBuffer() {
+        reset();
+    }
+
+    /**
+     * Resets the buffer data
+     */
+    public synchronized void reset() {
+        this.details = null;
+        this.state = null;
+        this.startTimestamp = null;
+        this.changed = true;
+        this.partySize = -1;
+        this.partyMax = -1;
+    }
+
+    /**
+     * Sets the details of the current game
+     *
+     * @param details Details about the current game (null for nothing)
+     */
+    public synchronized void setDetails(String details) {
+        this.details = details;
+    }
+
+    /**
+     * Gets the details about the current game
+     *
+     * @return Detail about the current game
+     */
+    public synchronized String getDetails() {
+        return details;
+    }
+
+    /**
+     * Sets the current party status
+     *
+     * @param state The current party status (null for nothing)
+     */
+    public synchronized void setState(String state) {
+        this.state = state;
+        this.changed = true;
+    }
+
+    /**
+     * Returns the current party status
+     *
+     * @return The current party status
+     */
+    public synchronized String getState() {
+        return state;
+    }
+
+    /**
+     * Sets the start of the game
+     *
+     * @param startTimestamp The time when that action has start or null to hide it
+     */
+    public synchronized void setStartTimestamp(OffsetDateTime startTimestamp) {
+        this.startTimestamp = startTimestamp;
+        this.changed = true;
+    }
+
+    /**
+     * Returns the start of the game
+     *
+     * @return The start of the game
+     */
+    public synchronized OffsetDateTime getStartTimestamp() {
+        return startTimestamp;
+    }
+
+    /**
+     * Sets the current party size
+     *
+     * @param partySize The current party size
+     */
+    public synchronized void setPartySize(int partySize) {
+        this.partySize = partySize;
+        this.changed = true;
+    }
+
+    /**
+     * Returns the current party size
+     *
+     * @return The party size
+     */
+    public synchronized int getPartySize() {
+        return partySize;
+    }
+
+    /**
+     * Sets the maximum number of the players in the party
+     *
+     * @param partyMax The number of the players
+     */
+    public synchronized void setPartyMax(int partyMax) {
+        this.partyMax = partyMax;
+        this.changed = true;
+    }
+
+    /**
+     * Returns the maximum number of players in the party
+     *
+     * @return The maximum number of players in the party
+     */
+    public synchronized int getPartyMax() {
+        return partyMax;
+    }
+
+    /**
+     * Check if the buffer has changed
+     *
+     * @return if the buffer has changed
+     */
+    public synchronized boolean hasChanged() {
+        return changed;
+    }
+
+    /**
+     * Check if the buffer is empty
+     *
+     * @return if the buffer is empty
+     */
+    public synchronized boolean isEmpty() {
+        return this.details == null && this.state == null && this.startTimestamp == null;
+    }
+
+    /**
+     * Resets the buffer's change state to false
+     */
+    synchronized void resetState() {
+        this.changed = false;
+    }
+}