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/*
* SonarQube
* Copyright (C) 2009-2018 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;
import java.util.Arrays;
import java.util.Collections;
import java.util.EnumMap;
import java.util.EnumSet;
import java.util.Map;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.sonar.application.NodeLifecycle.State.INIT;
import static org.sonar.application.NodeLifecycle.State.OPERATIONAL;
import static org.sonar.application.NodeLifecycle.State.STARTING;
import static org.sonar.application.NodeLifecycle.State.STOPPED;
import static org.sonar.application.NodeLifecycle.State.STOPPING;
/**
* Lifecycle of the cluster node, consolidating the states
* of child processes.
*/
class NodeLifecycle {
private static final Logger LOG = LoggerFactory.getLogger(NodeLifecycle.class);
enum State {
// initial state, does nothing
INIT,
// at least one process is still starting
STARTING,
// all the processes are started and operational
OPERATIONAL,
// at least one process is still stopping
STOPPING,
// all processes are stopped
STOPPED
}
private static final Map<State, Set<State>> TRANSITIONS = buildTransitions();
private State 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(OPERATIONAL, STOPPING, STOPPED));
res.put(OPERATIONAL, toSet(STOPPING, STOPPED));
res.put(STOPPING, toSet(STOPPED));
res.put(STOPPED, toSet(STARTING));
return 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;
}
LOG.trace("tryToMoveTo from {} to {} => {}", currentState, to, res);
return res;
}
}
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