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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 java.util.Arrays;
import java.util.Collections;
import java.util.EnumMap;
import java.util.EnumSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.sonar.process.ProcessId;
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;
public class ManagedProcessLifecycle {
public enum State {
INIT, STARTING, STARTED, STOPPING, HARD_STOPPING, FINALIZE_STOPPING, STOPPED
}
private static final Logger LOG = LoggerFactory.getLogger(ManagedProcessLifecycle.class);
private static final Map<State, Set<State>> TRANSITIONS = buildTransitions();
private final ProcessId processId;
private final List<ProcessLifecycleListener> listeners;
private State state;
public ManagedProcessLifecycle(ProcessId processId, List<ProcessLifecycleListener> listeners) {
this.processId = processId;
this.listeners = listeners;
this.state = INIT;
}
private static Map<State, Set<State>> buildTransitions() {
Map<State, Set<State>> res = new EnumMap<>(State.class);
res.put(INIT, toSet(STARTING));
res.put(STARTING, toSet(STARTED, STOPPING, HARD_STOPPING));
res.put(STARTED, toSet(STOPPING, HARD_STOPPING));
res.put(STOPPING, toSet(HARD_STOPPING, FINALIZE_STOPPING));
res.put(HARD_STOPPING, toSet(FINALIZE_STOPPING));
res.put(FINALIZE_STOPPING, toSet(STOPPED));
res.put(STOPPED, toSet());
return Collections.unmodifiableMap(res);
}
private static Set<State> toSet(State... states) {
if (states.length == 0) {
return Collections.emptySet();
}
if (states.length == 1) {
return Collections.singleton(states[0]);
}
return EnumSet.copyOf(Arrays.asList(states));
}
State getState() {
return state;
}
synchronized boolean tryToMoveTo(State to) {
boolean res = false;
State currentState = state;
if (TRANSITIONS.get(currentState).contains(to)) {
this.state = to;
res = true;
listeners.forEach(listener -> listener.onProcessState(processId, to));
}
LOG.debug("{} tryToMoveTo {} from {} to {} => {}", Thread.currentThread().getName(), processId.getHumanReadableName(), currentState, to, res);
return res;
}
}
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