/jboss-as-7.1.1.Final/controller/src/main/java/org/jboss/as/controller/ControlledProcessState.java
Java | 159 lines | 85 code | 25 blank | 49 comment | 16 complexity | a47290f8a4401899289e5a8f4cbb9956 MD5 | raw file
Possible License(s): LGPL-2.1, Apache-2.0
- /*
- * JBoss, Home of Professional Open Source.
- * Copyright 2011, Red Hat, Inc., and individual contributors
- * as indicated by the @author tags. See the copyright.txt file in the
- * distribution for a full listing of individual contributors.
- *
- * This 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 2.1 of
- * the License, or (at your option) any later version.
- *
- * This software 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 software; if not, write to the Free
- * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
- * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
- */
- package org.jboss.as.controller;
- import java.util.concurrent.atomic.AtomicInteger;
- import java.util.concurrent.atomic.AtomicStampedReference;
- /**
- * The overall state of a process that is being managed by a {@link ModelController}.
- *
- * @author Brian Stansberry (c) 2011 Red Hat Inc.
- */
- public class ControlledProcessState {
- public static enum State {
- /**
- * The process is starting and its runtime state is being made consistent with its persistent configuration.
- */
- STARTING("starting"),
- /**
- * The process is started, is running normally and has a runtime state consistent with its persistent configuration.
- */
- RUNNING("running"),
- /**
- * The process requires a stop and re-start of its root service (but not a full process restart) in order to
- * ensure stable operation and/or to bring its running state in line with its persistent configuration. A
- * stop and restart of the root service (also known as a 'reload') will result in the removal of all other
- * services and creation of new services based on the current configuration, so its affect on availability to
- * handle external requests is similar to that of a full process restart. However, a reload can execute more
- * quickly than a full process restart.
- */
- RELOAD_REQUIRED("reload-required"),
- /**
- * The process must be terminated and replaced with a new process in order to ensure stable operation and/or to bring
- * the running state in line with the persistent configuration.
- */
- RESTART_REQUIRED("restart-required"),
- /** The process is stopping. */
- STOPPING("stopping");
- private final String stringForm;
- private State(final String stringForm) {
- this.stringForm = stringForm;
- }
- @Override
- public String toString() {
- return stringForm;
- }
- }
- private final AtomicInteger stamp = new AtomicInteger(0);
- private final AtomicStampedReference<State> state = new AtomicStampedReference<State>(State.STARTING, 0);
- private final boolean reloadSupported;
- public ControlledProcessState(final boolean reloadSupported) {
- this.reloadSupported = reloadSupported;
- }
- public State getState() {
- return state.getReference();
- }
- public boolean isReloadSupported() {
- return reloadSupported;
- }
- public void setStarting() {
- state.set(State.STARTING, stamp.incrementAndGet());
- }
- public void setRunning() {
- state.set(State.RUNNING, stamp.incrementAndGet());
- }
- public void setStopping() {
- state.set(State.STOPPING, stamp.incrementAndGet());
- }
- public Object setReloadRequired() {
- if (!reloadSupported) {
- return setRestartRequired();
- }
- AtomicStampedReference<State> stateRef = state;
- int newStamp = stamp.incrementAndGet();
- int[] receiver = new int[1];
- // Keep trying until stateRef is RELOAD_REQUIRED with our stamp
- for (;;) {
- State was = stateRef.get(receiver);
- if (was == State.STARTING || was == State.STOPPING || was == State.RESTART_REQUIRED) {
- break;
- }
- if (stateRef.compareAndSet(was, State.RELOAD_REQUIRED, receiver[0], newStamp)) {
- break;
- }
- }
- return Integer.valueOf(newStamp);
- }
- public Object setRestartRequired() {
- AtomicStampedReference<State> stateRef = state;
- int newStamp = stamp.incrementAndGet();
- int[] receiver = new int[1];
- // Keep trying until stateRef is RESTART_REQUIRED with our stamp
- for (;;) {
- State was = stateRef.get(receiver);
- if (was == State.STARTING || was == State.STOPPING) {
- break;
- }
- if (stateRef.compareAndSet(was, State.RESTART_REQUIRED, receiver[0], newStamp)) {
- break;
- }
- }
- return Integer.valueOf(newStamp);
- };
- public void revertReloadRequired(Object stamp) {
- if (!reloadSupported) {
- revertRestartRequired(stamp);
- }
- // If 'state' still has the state we last set in restartRequired(), change to RUNNING
- Integer theirStamp = Integer.class.cast(stamp);
- state.compareAndSet(State.RELOAD_REQUIRED, State.RUNNING, theirStamp, this.stamp.incrementAndGet());
- }
- public void revertRestartRequired(Object stamp) {
- // If 'state' still has the state we last set in restartRequired(), change to RUNNING
- Integer theirStamp = Integer.class.cast(stamp);
- state.compareAndSet(State.RESTART_REQUIRED, State.RUNNING, theirStamp, this.stamp.incrementAndGet());
- }
- }