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/*
* SonarQube
* Copyright (C) 2009-2025 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.application.process;
import com.tngtech.java.junit.dataprovider.DataProvider;
import com.tngtech.java.junit.dataprovider.DataProviderRunner;
import com.tngtech.java.junit.dataprovider.UseDataProvider;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.sonar.process.ProcessId;
import static java.util.Arrays.asList;
import static java.util.Collections.emptyList;
import static org.assertj.core.api.Assertions.assertThat;
import static org.sonar.application.process.ManagedProcessLifecycle.State;
import static org.sonar.application.process.ManagedProcessLifecycle.State.FINALIZE_STOPPING;
import static org.sonar.application.process.ManagedProcessLifecycle.State.HARD_STOPPING;
import static org.sonar.application.process.ManagedProcessLifecycle.State.INIT;
import static org.sonar.application.process.ManagedProcessLifecycle.State.STARTED;
import static org.sonar.application.process.ManagedProcessLifecycle.State.STARTING;
import static org.sonar.application.process.ManagedProcessLifecycle.State.STOPPED;
import static org.sonar.application.process.ManagedProcessLifecycle.State.STOPPING;
@RunWith(DataProviderRunner.class)
public class ManagedProcessLifecycleTest {
@Test
public void initial_state_is_INIT() {
ManagedProcessLifecycle lifecycle = new ManagedProcessLifecycle(ProcessId.ELASTICSEARCH, emptyList());
assertThat(lifecycle.getState()).isEqualTo(INIT);
}
@Test
public void listeners_are_not_notified_of_INIT_state() {
TestLifeCycleListener listener = new TestLifeCycleListener();
new ManagedProcessLifecycle(ProcessId.ELASTICSEARCH, Arrays.asList(listener));
assertThat(listener.states).isEmpty();
}
@Test
public void try_to_move_does_not_support_jumping_states() {
TestLifeCycleListener listener = new TestLifeCycleListener();
ManagedProcessLifecycle lifecycle = new ManagedProcessLifecycle(ProcessId.ELASTICSEARCH, asList(listener));
assertThat(lifecycle.getState()).isEqualTo(INIT);
assertThat(listener.states).isEmpty();
assertThat(lifecycle.tryToMoveTo(STARTED)).isFalse();
assertThat(lifecycle.getState()).isEqualTo(INIT);
assertThat(listener.states).isEmpty();
assertThat(lifecycle.tryToMoveTo(STARTING)).isTrue();
assertThat(lifecycle.getState()).isEqualTo(STARTING);
assertThat(listener.states).containsOnly(STARTING);
}
@Test
@UseDataProvider("allStates")
public void no_state_can_not_move_to_itself(State state) {
assertThat(newLifeCycle(state).tryToMoveTo(state)).isFalse();
}
@Test
@UseDataProvider("allStates")
public void can_move_to_HARD_STOPPING_from_STARTING_AND_STARTED_and_STOPPING_only(State state) {
verifyCanMoveTo(t -> t == STARTING || t == STARTED || t == STOPPING,
state, HARD_STOPPING);
}
@Test
@UseDataProvider("allStates")
public void can_move_to_STARTED_from_STARTING_only(State state) {
verifyCanMoveTo(t -> t == STARTING, state, STARTED);
}
private void verifyCanMoveTo(Predicate<State> isAllowed, State from, State to) {
TestLifeCycleListener listener = new TestLifeCycleListener();
ManagedProcessLifecycle underTest = newLifeCycle(from, listener);
boolean tryToMoveTo = underTest.tryToMoveTo(to);
if (isAllowed.test(from)) {
assertThat(tryToMoveTo).isTrue();
} else {
assertThat(tryToMoveTo).isFalse();
}
}
@Test
@UseDataProvider("allStates")
public void cannot_move_to_any_state_from_STOPPED(State state) {
assertThat(newLifeCycle(STOPPED).tryToMoveTo(state)).isFalse();
}
private static ManagedProcessLifecycle newLifeCycle(State from, State to, TestLifeCycleListener... listeners) {
ManagedProcessLifecycle lifecycle = newLifeCycle(from, listeners);
assertThat(lifecycle.tryToMoveTo(to)).isTrue();
assertThat(lifecycle.getState()).isEqualTo(to);
Arrays.stream(listeners)
.forEach(t -> assertThat(t.states).endsWith(to));
return lifecycle;
}
/**
* Creates a Lifecycle object in the specified state emulating that the shortest path to this state has been followed
* to reach it.
*/
private static ManagedProcessLifecycle newLifeCycle(State state, TestLifeCycleListener... listeners) {
switch (state) {
case INIT:
return new ManagedProcessLifecycle(ProcessId.ELASTICSEARCH, asList(listeners));
case STARTING:
return newLifeCycle(INIT, state, listeners);
case STARTED:
return newLifeCycle(STARTING, state, listeners);
case STOPPING:
return newLifeCycle(STARTED, state, listeners);
case HARD_STOPPING:
return newLifeCycle(STARTED, state, listeners);
case FINALIZE_STOPPING:
return newLifeCycle(STOPPING, state, listeners);
case STOPPED:
return newLifeCycle(FINALIZE_STOPPING, state, listeners);
default:
throw new IllegalStateException("new state is not supported:" + state);
}
}
@DataProvider
public static Object[][] allStates() {
return Arrays.stream(State.values())
.map(t -> new Object[] {t})
.toArray(Object[][]::new);
}
private static final class TestLifeCycleListener implements ProcessLifecycleListener {
private final List<State> states = new ArrayList<>();
@Override
public void onProcessState(ProcessId processId, State state) {
this.states.add(state);
}
}
}
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