It applies to the state region that
outgoing transition may be presented as a state symbol with a list of the state names and an outgoing transition symbol
Simple composite state contains just one region. Each region may have an optional name and contains the nested disjoint states and
the transitions between these. A state has five parts: 1. The bar may have one or more arrows from the bar to states.
states to the bar. State nesting combined with entry and exit actions significantly complicates the state transition semantics in HSMs compared to the traditional FSMs. Even though orthogonal regions imply independence of execution (allowing more or less concurrency), the UML specification does not require that a separate thread of execution be assigned to each orthogonal region (although this can be done if desired). State machine could be rendered in the frame labeled as As shown in Figure 5, it could be specified that the exit action from "heating" disables the heater, the entry action to "door_open" lights up the oven lamp, and the exit action from "door_open" extinguishes the lamp. The state machine that The target state configuration is completely entered only after encountering a leaf state that has no initial transitions. Avoiding repetition allows the growth of HSMs to remain proportionate to growth in system complexity. A transition string may be shown near the bar. The notation for a fork is a short heavy bar. It applies to the state region that For example, apart from the main keypad, a computer keyboard has an independent numeric keypad. the name associated with it. Entry – Action performed on entry to state 3. conditions evaluate to false are disabled.
State Name – Name of State 2. The use of entry and exit actions is preferable to placing an action on a transition because it avoids repetitive coding and improves function by eliminating a safety hazard; (heater on while door open).
An entry point is shown as a small circle on the border of the state machine diagram or composite state, combining a transition entering a fork pseudostate with a set of transitions exiting the fork pseudostate, we get a The order in which the guards are evaluated is not defined. Such decomposition means that a composite state can contain two or more orthogonal regions (orthogonal means compatible and independent in this context) and that being in such a composite state entails being in all its orthogonal regions simultaneously.Orthogonal regions address the frequent problem of a combinatorial increase in the number of states when the behavior of a system is fragmented into independent, concurrently active parts. to the syntax above or using graphical symbols on a transition. In some cases, it is convenient to hide the decomposition of a composite state. A given state may only be decomposed in one of these two ways. Choice based on guards applied to the value inside diamond An example of transition with guard constraint and transition string: This condition must be established before entering any substate of "heating" because entry actions to a substate of "heating," like "toasting," rely on proper initialization of the "heating" superstate and perform only the differences from this initialization. Without such reuse, even a moderate increase in system complexity could lead to an explosive increase in the number of states and transitions. The following nodes and edges are typically drawn in represents a transition to the initial pseudostate in each region. The compartments of the state are: For example, if a system is in the "on" superstate (Figure 3), it may be the case that it is also in either "operand1" substate OR the "operand2" substate OR the "opEntered" substate OR the "result" substate. For example, changing the limit governed by This flexibility of extended state machines comes with a price, however, because of the complex coupling between the "qualitative" and the "quantitative" aspects of the extended state. The entry, exit, and behavior actions and internal transitions are defined as part of the compound transition that leads to a set of orthogonal target states. If more than one of the guards evaluates to true, an arbitrary one is selected. Therefore, UML statecharts provide a number of ways for orthogonal regions to communicate and synchronize their behaviors.
The special case of the transition from the junction having a history as target may optionally be presented The notation for a join is a short heavy bar. The left operand is placed inside the diamond-shaped symbol and the rest of the guard expressions They provide a number of features for eliminating the repetitions so that the complexity of a UML state machine no longer explodes but tends to faithfully represent the complexity of the reactive system it describes. For example, the identity of the "heating" state is determined by the fact that the heater is turned on. Achieving short RTC steps can often significantly complicate real-time designs. The need for guards is the immediate consequence of adding memory All state machine formalisms, including UML state machines, universally assume that a state machine completes processing of each event before it can start processing the next event. A shallow history is indicated by a small circle containing an "H". The semantics of exit actions guarantees that, regardless of the transition path, the heater will be disabled when the toaster is not in the "heating" state. If none of the guards evaluates to true, then the model is considered ill-formed. unless there are choice points along one or more of the paths. solid line. A composite state or state machine with just one region is shown by showing a nested state diagram within the graph Static conditional branches A state is not allowed to have both regions and a submachine. diagram or composite state. A choice pseudostate is shown as a diamond-shaped symbol. UML statecharts also introduce the complementary AND-decomposition. Composite state may have compartments. Noticed a spelling error? In order to indicate that an inherited region is extended, the keyword «extended» is associated with the name of the
states to the bar. State nesting combined with entry and exit actions significantly complicates the state transition semantics in HSMs compared to the traditional FSMs. Even though orthogonal regions imply independence of execution (allowing more or less concurrency), the UML specification does not require that a separate thread of execution be assigned to each orthogonal region (although this can be done if desired). State machine could be rendered in the frame labeled as As shown in Figure 5, it could be specified that the exit action from "heating" disables the heater, the entry action to "door_open" lights up the oven lamp, and the exit action from "door_open" extinguishes the lamp. The state machine that The target state configuration is completely entered only after encountering a leaf state that has no initial transitions. Avoiding repetition allows the growth of HSMs to remain proportionate to growth in system complexity. A transition string may be shown near the bar. The notation for a fork is a short heavy bar. It applies to the state region that For example, apart from the main keypad, a computer keyboard has an independent numeric keypad. the name associated with it. Entry – Action performed on entry to state 3. conditions evaluate to false are disabled.
State Name – Name of State 2. The use of entry and exit actions is preferable to placing an action on a transition because it avoids repetitive coding and improves function by eliminating a safety hazard; (heater on while door open).
An entry point is shown as a small circle on the border of the state machine diagram or composite state, combining a transition entering a fork pseudostate with a set of transitions exiting the fork pseudostate, we get a The order in which the guards are evaluated is not defined. Such decomposition means that a composite state can contain two or more orthogonal regions (orthogonal means compatible and independent in this context) and that being in such a composite state entails being in all its orthogonal regions simultaneously.Orthogonal regions address the frequent problem of a combinatorial increase in the number of states when the behavior of a system is fragmented into independent, concurrently active parts. to the syntax above or using graphical symbols on a transition. In some cases, it is convenient to hide the decomposition of a composite state. A given state may only be decomposed in one of these two ways. Choice based on guards applied to the value inside diamond An example of transition with guard constraint and transition string: This condition must be established before entering any substate of "heating" because entry actions to a substate of "heating," like "toasting," rely on proper initialization of the "heating" superstate and perform only the differences from this initialization. Without such reuse, even a moderate increase in system complexity could lead to an explosive increase in the number of states and transitions. The following nodes and edges are typically drawn in represents a transition to the initial pseudostate in each region. The compartments of the state are: For example, if a system is in the "on" superstate (Figure 3), it may be the case that it is also in either "operand1" substate OR the "operand2" substate OR the "opEntered" substate OR the "result" substate. For example, changing the limit governed by This flexibility of extended state machines comes with a price, however, because of the complex coupling between the "qualitative" and the "quantitative" aspects of the extended state. The entry, exit, and behavior actions and internal transitions are defined as part of the compound transition that leads to a set of orthogonal target states. If more than one of the guards evaluates to true, an arbitrary one is selected. Therefore, UML statecharts provide a number of ways for orthogonal regions to communicate and synchronize their behaviors.
The special case of the transition from the junction having a history as target may optionally be presented The notation for a join is a short heavy bar. The left operand is placed inside the diamond-shaped symbol and the rest of the guard expressions They provide a number of features for eliminating the repetitions so that the complexity of a UML state machine no longer explodes but tends to faithfully represent the complexity of the reactive system it describes. For example, the identity of the "heating" state is determined by the fact that the heater is turned on. Achieving short RTC steps can often significantly complicate real-time designs. The need for guards is the immediate consequence of adding memory All state machine formalisms, including UML state machines, universally assume that a state machine completes processing of each event before it can start processing the next event. A shallow history is indicated by a small circle containing an "H". The semantics of exit actions guarantees that, regardless of the transition path, the heater will be disabled when the toaster is not in the "heating" state. If none of the guards evaluates to true, then the model is considered ill-formed. unless there are choice points along one or more of the paths. solid line. A composite state or state machine with just one region is shown by showing a nested state diagram within the graph Static conditional branches A state is not allowed to have both regions and a submachine. diagram or composite state. A choice pseudostate is shown as a diamond-shaped symbol. UML statecharts also introduce the complementary AND-decomposition. Composite state may have compartments. Noticed a spelling error? In order to indicate that an inherited region is extended, the keyword «extended» is associated with the name of the