| /******************************************************************************* |
| * Copyright (c) 2012, 2015 Ericsson |
| * Copyright (c) 2010, 2011 École Polytechnique de Montréal |
| * Copyright (c) 2010, 2011 Alexandre Montplaisir <alexandre.montplaisir@gmail.com> |
| * |
| * All rights reserved. This program and the accompanying materials are |
| * made available under the terms of the Eclipse Public License 2.0 which |
| * accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| *******************************************************************************/ |
| |
| package org.eclipse.tracecompass.tmf.core.statesystem; |
| |
| import org.eclipse.jdt.annotation.Nullable; |
| import org.eclipse.tracecompass.statesystem.core.ITmfStateSystem; |
| import org.eclipse.tracecompass.statesystem.core.ITmfStateSystemBuilder; |
| import org.eclipse.tracecompass.tmf.core.event.ITmfEvent; |
| import org.eclipse.tracecompass.tmf.core.trace.ITmfTrace; |
| |
| /** |
| * This is the interface used to define the "state change input", which is the |
| * main type of input that goes in the state system. |
| * |
| * Usually a state change input, also called "state provider" is the piece of |
| * the pipeline which converts trace events to state changes. |
| * |
| * @author Alexandre Montplaisir |
| */ |
| public interface ITmfStateProvider { |
| |
| /** |
| * Different future event type on the state system |
| * |
| * @author Katherine Nadeau |
| * @since 5.0 |
| */ |
| public enum FutureEventType { |
| /** |
| * Modify attribute event |
| */ |
| MODIFICATION, |
| /** |
| * push value to a stack |
| */ |
| PUSH, |
| /** |
| * Pop from a stack |
| */ |
| POP; |
| } |
| |
| /** |
| * Event handler plugins should provide a version number. This is used to |
| * determine if a potential existing file can be re-opened later (if the |
| * versions in the file and in the viewer match), or if the file should be |
| * rebuilt from scratch (if the versions don't match). |
| * |
| * @return The version number of the input plugin |
| */ |
| int getVersion(); |
| |
| /** |
| * Get the trace with which this state input plugin is associated. |
| * |
| * @return The associated trace |
| */ |
| ITmfTrace getTrace(); |
| |
| /** |
| * Return the start time of this "state change input", which is normally the |
| * start time of the originating trace (or it can be the time of the first |
| * state-changing event). |
| * |
| * @return The start time |
| */ |
| long getStartTime(); |
| |
| /** |
| * Return the last time at which it is safe to query the state system under |
| * construction, ie not the current end time of the underlying state system, |
| * but the time just before the latest event that has been processed. |
| * |
| * @return The last timestamp at which it is safe to query the state system |
| * underneath |
| * @since 2.0 |
| */ |
| long getLatestSafeTime(); |
| |
| /** |
| * Assign the target state system where this SCI will insert its state |
| * changes. Because of dependencies issues, this can normally not be done at |
| * the constructor. |
| * |
| * This needs to be called before .run()! |
| * |
| * @param ssb |
| * Target state system for the state changes generated by this |
| * input plugin |
| */ |
| void assignTargetStateSystem(ITmfStateSystemBuilder ssb); |
| |
| /** |
| * Return the currently assigned target state system. |
| * |
| * @return Reference to the currently assigned state system, or null if no |
| * SS is assigned yet |
| */ |
| @Nullable ITmfStateSystem getAssignedStateSystem(); |
| |
| /** |
| * Send an event to this input plugin for processing. The implementation |
| * should check the contents, and call the state-modifying methods of its |
| * IStateSystemBuilder object accordingly. |
| * |
| * @param event |
| * The event (which should be safe to cast to the |
| * expectedEventType) that has to be processed. |
| */ |
| void processEvent(ITmfEvent event); |
| |
| /** |
| * Provide a non-initialized copy of this state input plugin. You will need |
| * to call {@link #assignTargetStateSystem} on it to assign its target. |
| * |
| * @return A new state change input object, of the same type, but without an |
| * assigned target state system |
| */ |
| ITmfStateProvider getNewInstance(); |
| |
| /** |
| * Indicate to the state history building process that we are done (for now), |
| * and that it should close its current history. |
| */ |
| void dispose(); |
| |
| /** |
| * Callback when trace has been fully read |
| * @since 2.1 |
| */ |
| default void done() { |
| // do nothing |
| } |
| |
| /** |
| * Makes the state provider fail with a cause |
| * |
| * @param cause The cause of the failure |
| * @since 3.0 |
| */ |
| default void fail(Throwable cause) { |
| // Do nothing by default. |
| } |
| |
| /** |
| * Get the cause of failure, or <code>null</code> if there is no failure. |
| * |
| * @return The failure cause |
| * @since 3.0 |
| */ |
| default @Nullable Throwable getFailureCause() { |
| return null; |
| } |
| |
| /** |
| * Add future state. The value of the state will be changed at the requested |
| * time when it is safe to do so, ie when the analysis has reached this |
| * timestamp. |
| * |
| * @param time |
| * the time of the state |
| * @param futureValue |
| * the value of the state |
| * @param attribute |
| * the quark to set to initial state |
| * @since 4.1 |
| */ |
| default void addFutureEvent(long time, @Nullable Object futureValue, int attribute) { |
| addFutureEvent(time, futureValue, attribute, FutureEventType.MODIFICATION); |
| } |
| |
| /** |
| * Add future state. The value of the state will be changed at the requested |
| * time when it is safe to do so, ie when the analysis has reached this |
| * timestamp. |
| * |
| * @param time |
| * the time of the state |
| * @param futureValue |
| * the value of the state |
| * @param attribute |
| * the quark to set to initial state |
| * @param type |
| * the type of event to apply to the state system |
| * @since 5.0 |
| */ |
| default void addFutureEvent(long time, @Nullable Object futureValue, int attribute, FutureEventType type) { |
| // Do nothing by default |
| } |
| } |