git ssb

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module.exports = class AbstractContainer {
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  // The constructor is given an instance of the kernel
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  // https://github.com/primea/js-primea-hypervisor/blob/master/docs/kernel.md
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  constructor (kernel) {
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    this.kernel = kernel
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  }
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  // This method runs once when the container is initially created.
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  //
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  // In general, a root instance receives no message, but every other instance
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  // receives a message with a singel port, which is a channel to its parent (aka the root).
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  //
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  // Optionally it can return a single value.
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  async onCreation (message) {
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    throw new Error('Unimplemented initialiser')
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  }
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  // This method runs when the container needs to be started up. It cannot be
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  // called before onCreation was successful. It can be called after a shutdown
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  // was requested in onIdle.
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  async onStartup () {}
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  // This is called for each incoming message the container gets.
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  //
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  // Optionally it can return a single value.
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  async onMessage (message) {
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    throw new Error('Unimplemented message: ' + message.data)
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  }
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  // onIdle is called when there are no more immediate messages pending
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  // in the incoming queue for the container to receive.
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  //
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  // This can be overriden by a subclass.
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  onIdle () {
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    // This tells the kernel that it is safe to freeze (aka turn off) this container.
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    // This removes all references in memory and the next time this instance is
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    // requested it has to be deserialised from storage and spinned up. This can be
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    // a time consuming operation.
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    this.kernel.shutdown()
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  }
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}
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