io.molr.mole.core.api

Interface Mole

All Known Implementing Classes:

AbstractJavaMole, LocalSuperMole, RunnableLeafsMole, SingleNodeMole

public interface Mole

# TODO Ongoing work JAVADOC!!

This is the central place to interact with molr missions from the client side.

It provides methods to query what missions are available, instantiate and run/step through them. It depends on the implementation, if there is network communication behind or not. In general, the agency holds a state. However, all the returned streams shall cache the last values, so that whenever a new client subscribes, it gets an immediate update of the actual value.

Note that the full agency is designed in an asynchronous manner!

Method Summary

Modifier and Type	Method and Description
reactor.core.publisher.Mono<io.molr.commons.domain.MissionHandle>	instantiate(io.molr.commons.domain.Mission mission, java.util.Map<java.lang.String,java.lang.Object> params) Instantiates the given mission with the given parameters (Currently only string and integer parameters are supported).
void	instruct(io.molr.commons.domain.MissionHandle handle, io.molr.commons.domain.Strand strand, io.molr.commons.domain.StrandCommand command) Instructs the mission instance identified by the given handle to execute the given command on the given strand.
void	instructRoot(io.molr.commons.domain.MissionHandle handle, io.molr.commons.domain.StrandCommand command) Instructs the root strand of the mission identified by the given handle to execute a given command.
reactor.core.publisher.Flux<io.molr.commons.domain.MissionOutput>	outputsFor(io.molr.commons.domain.MissionHandle handle) Retrieves a stream of the actual output of one mission instance.
reactor.core.publisher.Mono<io.molr.commons.domain.MissionParameterDescription>	parameterDescriptionOf(io.molr.commons.domain.Mission mission) Retrieves information on what parameters a mission expects (name, type, optional or mandatory).
reactor.core.publisher.Mono<io.molr.commons.domain.MissionRepresentation>	representationOf(io.molr.commons.domain.Mission mission) Retrieves the initial (!) representation of a mission, meaning when the mission is not instantiated/running.
reactor.core.publisher.Flux<io.molr.commons.domain.MissionRepresentation>	representationsFor(io.molr.commons.domain.MissionHandle handle) Delivers updates of the representation of the mission.
reactor.core.publisher.Flux<io.molr.commons.domain.AgencyState>	states() Retrieves a stream of the actual AgencyState.
reactor.core.publisher.Flux<io.molr.commons.domain.MissionState>	statesFor(io.molr.commons.domain.MissionHandle handle) Retrieves a stream emitting new items anytime the state of the mission instance changes.

Method Detail

instantiate

reactor.core.publisher.Mono<io.molr.commons.domain.MissionHandle> instantiate(io.molr.commons.domain.Mission mission,
                                                                              java.util.Map<java.lang.String,java.lang.Object> params)

Instantiates the given mission with the given parameters (Currently only string and integer parameters are supported). The returned mono shall only emit, as soon as the mission is available and more detailed states can be retrieved by other methods of the agency, if queried with the given handle. As soon as the mission is instantiated (the returned mono emits), then the mission instance shall be in a paused state with the cursor of the root Strand on its first (or only) Block.

At this point in time, commands can be sent to the mission instance through the instruct(MissionHandle, Strand, StrandCommand) method (non-allowed commands shall be ignored by the agency and the underlying moles). The allowed commands (and other information) can be queried through the statesFor(MissionHandle) method.

Parameters:

mission - the mission which shall be instantiated

params - a map from parameter name to parameter value to instantiate the mission

Returns:

a mono of a new handle (unique throughout the lifetime of the agency), representing the instance of the mission and being emitted as soon as the mission instance is ready to receive commands.

states

reactor.core.publisher.Flux<io.molr.commons.domain.AgencyState> states()

Retrieves a stream of the actual AgencyState. This state contains information about all the available missions and those which are currently instantiated. The stream shall emit a new item whenever the state changes and shall be long-living, so basically never complete during the lifetime of the agency.

Returns:

a stream of states of the agency

statesFor

reactor.core.publisher.Flux<io.molr.commons.domain.MissionState> statesFor(io.molr.commons.domain.MissionHandle handle)

Retrieves a stream emitting new items anytime the state of the mission instance changes. Agency implementations (and underlying moles) shall guarantee that the stream emits at least once on new subscriptions. The mission state contains runtime information of the mission instance (for example, strands, cursor positions, run states of each strand and block).

Parameters:

handle - a handle representing the mission instance for which the states shall be retrieved

Returns:

a stream of mission states, emitting each time when the state changes and being completed only at the end of the lifecycle of the mission instance.

outputsFor

reactor.core.publisher.Flux<io.molr.commons.domain.MissionOutput> outputsFor(io.molr.commons.domain.MissionHandle handle)

Retrieves a stream of the actual output of one mission instance. The items in the stream represent a 'snapshot' of the actually available output of the whole mission. The returned stream shall emit each time the output changes and at least once on subscription. An output basically contains a map of output values per block.

Parameters:

handle - a handle representing the mission instance for which the output shall be queried.

Returns:

a stream of the actually available output for the mission instance.

representationsFor

reactor.core.publisher.Flux<io.molr.commons.domain.MissionRepresentation> representationsFor(io.molr.commons.domain.MissionHandle handle)

Delivers updates of the representation of the mission. Implementations of the agency (and underlying moles) shall guarantee that the returned stream emits at least once for a newly subscribed client.

Parameters:

handle - the handle of the mission for which to retrieve representation updates

Returns:

a stream emitting whenever the representation changes, and at least once on subscription.

representationOf

reactor.core.publisher.Mono<io.molr.commons.domain.MissionRepresentation> representationOf(io.molr.commons.domain.Mission mission)

Retrieves the initial (!) representation of a mission, meaning when the mission is not instantiated/running. This representation contains for example the tree structure of the mission. In many (or even most) cases, this information will be static (so not change over the lifecycle of a mission). So, for specific clients - when they know that the structure does not change - it might be sufficient to use this method only to determine the structure. However, for the general case (imagine for example a mission like a parametrized junit test), it is recommended to use this method only to get the initial representation (when no handle exists yet), and then subscribe to the stream provided representationsFor(MissionHandle), to be notified of any changes in the representation.

Parameters:

mission - the mission for which to retrieve the initial (!) representation

Returns:

a mono, emitting the initial representation as soon as it is available (usually instantly).

parameterDescriptionOf

reactor.core.publisher.Mono<io.molr.commons.domain.MissionParameterDescription> parameterDescriptionOf(io.molr.commons.domain.Mission mission)

Retrieves information on what parameters a mission expects (name, type, optional or mandatory). For interactive clients it is recommended to use this information to help the user to input only valid values.

Parameters:

mission - the mission for which the information shall be queried.

Returns:

a stream emitting the information about expected parameters as soon as it is available (usually instantly).

instruct

void instruct(io.molr.commons.domain.MissionHandle handle,
              io.molr.commons.domain.Strand strand,
              io.molr.commons.domain.StrandCommand command)

Instructs the mission instance identified by the given handle to execute the given command on the given strand. The allowed commands can be 'guessed' by using the information from statesFor(MissionHandle). However, due to the asynchronous nature of the whole framework, it can never be guaranteed that the command is still allowed when sent. For that reason, non-allowed commands shall be ignored by the implementations of an agency and underlying moles.

Parameters:

handle - a handle representing the mission instance on which the command shall be executed

strand - the strand of the mission instance on which the command shall be executed

command - the command to execute

See Also:

StrandCommand, Strand

instructRoot

void instructRoot(io.molr.commons.domain.MissionHandle handle,
                  io.molr.commons.domain.StrandCommand command)

Instructs the root strand of the mission identified by the given handle to execute a given command. This is mainly a convenience method to execute commands without knowing the actual strand structure, as there has to be always to be a root strand. This is e.g. useful if missions simply have to be run without any GUI interaction. This can be accomplished by sending a resume command through this method. The rest of the behaviour shall be identical to the instruct(MissionHandle, Strand, StrandCommand) method.

Parameters:

handle - a handle representing the mission instance on which the command shall be executed

command - the command to execute.