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copied!<blockquote> <p><strong>Q:</strong> What an Erlang/OTP beginner should know about behaviours? Is it possible to describe and understand the notion of OTP behaviour in a nutshell?</p> </blockquote> <p>A behaviour is usually used in code so that the compiler can generate more intuitive error messages depending upon its behaviour i.e application/supervisor/gen_server/gen_event/gen_fsm.</p> <p>It enables the compiler give error messages specific to the behaviour for ex: gen_server</p> <blockquote> <p><strong>Q:</strong> What 'callback function' does actually mean in the context of Elang/OTP?</p> </blockquote> <p>Callback function can be said to be taken from GUI programming (at least similar). Whenever an event occurs for ex. a mouse click there is a separate function that handles mouse click.</p> <p>Thus whenever for eg. an exported function of a gen_server is called from another module, that function can have a callback function (handle_call/handle_cast) having different patterns.</p> <blockquote> <p><strong>Q:</strong> Can we consider the callbacks in a behaviour implementation as methods overridden in Java?</p> </blockquote> <p>Yeah...maybe...no :)</p> <blockquote> <p><strong>Q:</strong> The book says that the associated callback function for the library function 'gen_server:start_link/4' in the following code is 'Module:init/1'.</p> </blockquote> <p>gen_server:start_link calls init function by itself as answered by w55.... (sorry quite a big name).</p> <hr/> <p>Hope I have answered all your queries :)</p>

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