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package com.sun.xml.ws.commons.ha;
import com.sun.istack.logging.Logger;
import com.sun.xml.ws.api.ha.HaInfo;
import com.sun.xml.ws.api.message.Packet;
import java.util.logging.Level;
/**
* Runtime HA context implemented using thread local state data
*
* @author Marek Potociar (marek.potociar at sun.com)
*/
public class HaContext {
private static final Logger LOGGER = Logger.getLogger(HaContext.class);
/**
* Internal state data of the HA context
*/
public static final class State {
private static final State EMPTY = new State(null, null);
private final Packet packet;
private final HaInfo haInfo;
private State(Packet packet, HaInfo haInfo) {
this.packet = packet;
this.haInfo = haInfo;
}
@Override
public String toString() {
return "HaState{packet=" + packet + ", haInfo=" + HaContext.asString(haInfo) + '}';
}
}
//
private static final ThreadLocal<State> state = new ThreadLocal<State>() {
@Override
protected State initialValue() {
return State.EMPTY;
}
};
public static State initFrom(final Packet packet) {
final State oldState = state.get();
HaInfo haInfo = null;
if (packet != null && packet.supports(Packet.HA_INFO)) {
haInfo = (HaInfo) packet.get(Packet.HA_INFO);
}
final State newState = new State(packet, haInfo);
state.set(newState);
if (LOGGER.isLoggable(Level.FINER)) {
LOGGER.finer("[METRO-HA] " + Thread.currentThread().toString() + " : Initialized from packet - replaced old " + oldState.toString() + " with a new " + newState.toString());
}
return oldState;
}
public static State initFrom(final State newState) {
final State oldState = state.get();
state.set(newState);
if (LOGGER.isLoggable(Level.FINER)) {
LOGGER.finer("[METRO-HA] " + Thread.currentThread().toString() + " : Initialized from state - replaced old " + oldState.toString() + " with a new " + newState.toString());
}
return oldState;
}
public static State currentState() {
return state.get();
}
public static void clear() {
state.set(State.EMPTY);
if (LOGGER.isLoggable(Level.FINER)) {
LOGGER.finer("[METRO-HA] " + Thread.currentThread().toString() + " : Current HA state cleared");
}
}
public static HaInfo currentHaInfo() {
return state.get().haInfo;
}
public static void udpateReplicaInstance(final String replicaInstance) {
boolean updateNeeded = false;
final State currentState = state.get();
if (currentState.haInfo == null) {
throw new IllegalStateException("Unable to update replicaInstance. Current HaInfo in the local thread is null.");
}
if (replicaInstance == null) {
updateNeeded = currentState.haInfo.getReplicaInstance() != null;
} else {
updateNeeded = !replicaInstance.equals(currentState.haInfo.getReplicaInstance());
}
if (updateNeeded) {
if (LOGGER.isLoggable(Level.FINER)) {
LOGGER.finer("[METRO-HA] " + Thread.currentThread().toString() + " : Replica instance value changed to '" + replicaInstance + "'. Updating current HaInfo.");
}
final HaInfo old = currentState.haInfo;
updateHaInfo(new HaInfo(old.getKey(), replicaInstance, old.isFailOver()));
} else if (LOGGER.isLoggable(Level.FINER)) {
LOGGER.finer("[METRO-HA] " + Thread.currentThread().toString() + " : New replica instance value '" + replicaInstance + "' same as current - no HaInfo update necessary");
}
}
public static void updateHaInfo(final HaInfo newValue) {
final Packet packet = state.get().packet;
state.set(new State(packet, newValue));
if (packet != null && packet.supports(Packet.HA_INFO)) {
packet.put(Packet.HA_INFO, newValue);
}
if (LOGGER.isLoggable(Level.FINER)) {
LOGGER.finer("[METRO-HA] " + Thread.currentThread().toString() + " : HaInfo value updated: " + asString(newValue));
}
}
public static boolean failoverDetected() {
final HaInfo haInfo = state.get().haInfo;
return haInfo != null && haInfo.isFailOver();
}
public static String asString(HaInfo haInfo) {
if (haInfo == null) {
return "null";
}
return "HaInfo{hashableKey=" + haInfo.getKey() + ", replicaInstance=" + haInfo.getReplicaInstance() + ", isFailover=" + haInfo.isFailOver() + "}";
}
}