First (first) commit.

Model/Datasource/Database/MysqlReplica.php

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+<?php
+
+App::uses('Mysql', 'Model/Datasource/Database');
+
+/**
+ * This class serves as modified extension of Cake's Mysql.php Datasource class.
+ * The intention of this class is to intervene in any Write-type and Read-type queries
+ * and switch between Source and Replica databases, adding load-balancing functionality
+ * to the system;
+ * All Write queries go to Source database and all Read queries go to
+ * a Replica database, which in turn was randomly assigned in database configuration (see database.php).
+ */
+class MysqlReplica extends Mysql
+{
+	/**
+	 * Datasource description
+	 *
+	 * @var string
+	 */
+	public $description = "MySQL DBO Driver compatible with MySQL Replication";
+
+	/**
+	 * Override _execute to use source or slave connection.
+	 * This method is declared in DboSource class which extends Mysql class.
+	 *
+	 * @param  string $sql            The SQL Query being executed.
+	 * @param  array  $options        Options.
+	 * @param  array  $prepareOptions Prepare query options.
+	 * @return resource
+	 */
+	protected function _execute($sql, $options = array(), $prepareOptions = array())
+	{
+		$write_transactions = [
+			'CREATE',
+			'DELETE',
+			'DROP',
+			'INSERT',
+			'UPDATE',
+			'TRUNCATE',
+			'REPLACE',
+			'START TRANSACTION',
+			'COMMIT',
+			'ROLLBACK'
+		];
+
+		$trimmed_sql = trim($sql);
+
+		if (preg_match('/^(SET NAMES)/i', $trimmed_sql))
+		{
+			/*
+			 * Not needed to set a connection as 'set names' is invoked in the connection constructor wheather
+			 * 'encoding' is specified on the connection beware though: explicitly setting a connection here
+			 * results in connection constructor being called again (and again and again…).
+			 */
+		}
+		else
+		{
+			$datasource = 'default';
+			if (preg_match('/^(' . implode('|', $write_transactions) . ')/i', $trimmed_sql))
+			{
+				$datasource = 'source';
+			}
+
+			$this->setConnection($datasource);
+		}
+
+		return parent::_execute($sql, $options, $prepareOptions);
+	}
+
+	/**
+	 * Switch the datasource to 'source' when beginning a transaction.
+	 *
+	 * @return mixed
+	 */
+	public function begin()
+	{
+		$this->setConnection('source');
+
+		return parent::begin();
+	}
+
+	/**
+	 * Switch the connection based on name.
+	 * Accepted names are 'source' and 'default' (a slave)
+	 * If in the middle of a transaction the 'source' connection will always be used.
+	 *
+	 * @param  string $name Datasource name.
+	 * @return void
+	 */
+	protected function setConnection($name = 'default')
+	{
+		if ($this->_transactionStarted)
+		{
+			$name = 'source';
+		}
+
+		$datasource = ConnectionManager::getDataSource($name);
+
+		if (!$datasource->isConnected())
+		{
+			$datasource->connect();
+		}
+
+		$this->_connection = $datasource->_connection;
+	}
+}

composer.json

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+{
+    "name": "adrian0350/cakephp-replication",
+    "description": "CakePHP 2.10.24 - MySQL Replication for MySQL 5.7",
+    "type": "cakephp-plugin",
+    "keywords": ["cakephp", "mysql", "replication", "master-slave"],
+    "homepage": "https://github.com/Adrian0350/CakeReplication",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Jaime Zúñiga",
+            "homepage": "http://jaimez.bond",
+            "role": "Author"
+        }
+    ],
+    "support": {
+        "issues": "https://github.com/Adrian0350/CakeReplication/issues",
+        "source": "https://github.com/Adrian0350/CakeReplication"
+    },
+    "require": {
+        "php": ">=7.4.33",
+		"cakephp/cakephp": "2.10.24"
+    },
+    "require-dev": {
+        "cakephp/cakephp-codesniffer": "^1.0.0"
+    },
+    "extra": {
+        "installer-name": "CakeReplication"
+    }
+}