registrar.hpp

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#ifndef __RESOURCE_PROVIDER_REGISTRAR_HPP__
#define __RESOURCE_PROVIDER_REGISTRAR_HPP__

#include <memory>

#include <process/future.hpp>
#include <process/owned.hpp>

#include <stout/nothing.hpp>
#include <stout/try.hpp>

#include "master/registrar.hpp"

#include "resource_provider/registry.hpp"

#include "slave/flags.hpp"


namespace mesos {
namespace resource_provider {

class Registrar
{
public:
  // Defines an abstraction for operations that can be applied on the
  // Registry.
  // TODO(xujyan): Make Operation generic so that we can apply them
  // against a generic "batch operation applier" abstraction, see TODO
  // in master/registrar.hpp for more details.
  class Operation : public process::Promise<bool>
  {
  public:
    virtual ~Operation() = default;

    // Attempts to invoke the operation on the registry object.
    //
    // Returns whether the operation mutates 'registry', or an error if
    // the operation cannot be applied successfully.
    Try<bool> operator()(registry::Registry* registry);

    // Sets the promise based on whether the operation was successful.
    bool set();

  protected:
    virtual Try<bool> perform(registry::Registry* registry) = 0;

  private:
    bool success = false;
  };

  // Create a registry on top of a master's persistent state.
  static Try<process::Owned<Registrar>> create(
      mesos::internal::master::Registrar* registrar);

  // Create a registry on top of an agent's persistent state.
  static Try<process::Owned<Registrar>> create(
      const mesos::internal::slave::Flags& slaveFlags,
      const SlaveID& slaveId);

  virtual ~Registrar() = default;

  virtual process::Future<Nothing> recover() = 0;
  virtual process::Future<bool> apply(process::Owned<Operation> operation) = 0;
};


class AdmitResourceProvider : public Registrar::Operation
{
public:
  explicit AdmitResourceProvider(const ResourceProviderID& id);

private:
  Try<bool> perform(registry::Registry* registry) override;

  ResourceProviderID id;
};


class RemoveResourceProvider : public Registrar::Operation
{
public:
  explicit RemoveResourceProvider(const ResourceProviderID& id);

private:
  Try<bool> perform(registry::Registry* registry) override;

  ResourceProviderID id;
};


class AgentRegistrarProcess;


class AgentRegistrar : public Registrar
{
public:
  AgentRegistrar(
      const mesos::internal::slave::Flags& slaveFlags,
      const SlaveID& slaveId);

  ~AgentRegistrar() override;

  process::Future<Nothing> recover() override;

  process::Future<bool> apply(process::Owned<Operation> operation) override;

private:
  std::unique_ptr<AgentRegistrarProcess> process;
};


class MasterRegistrarProcess;


class MasterRegistrar : public Registrar
{
public:
  explicit MasterRegistrar(mesos::internal::master::Registrar* Registrar);

  ~MasterRegistrar() override;

  // This registrar performs no recovery; instead to recover
  // the underlying master registrar needs to be recovered.
  process::Future<Nothing> recover() override;

  process::Future<bool> apply(process::Owned<Operation> operation) override;

private:
  std::unique_ptr<MasterRegistrarProcess> process;
};

} // namespace resource_provider {
} // namespace mesos {

#endif // __RESOURCE_PROVIDER_REGISTRAR_HPP__