/**
* Change the shared value value irrespective of its previous state
*
* @param newValue new value
* @throws Exception ZK errors, interruptions, etc.
*/
public void setValue(byte[] newValue) throws Exception {
Preconditions.checkState(state.get() == State.STARTED, "not started");
client.setData().forPath(path, newValue);
stat.setVersion(stat.getVersion() + 1);
value = Arrays.copyOf(newValue, newValue.length);
}
public static void copyStat(Stat from, Stat to) {
to.setAversion(from.getAversion());
to.setCtime(from.getCtime());
to.setCversion(from.getCversion());
to.setCzxid(from.getCzxid());
to.setMtime(from.getMtime());
to.setMzxid(from.getMzxid());
to.setPzxid(from.getPzxid());
to.setVersion(from.getVersion());
to.setEphemeralOwner(from.getEphemeralOwner());
to.setDataLength(from.getDataLength());
to.setNumChildren(from.getNumChildren());
}
/**
* Changes the shared value only if its value has not changed since this client last read it. If
* the value has changed, the value is not set and this client's view of the value is updated.
* i.e. if the value is not successful you can get the updated value by calling {@link
* #getValue()}.
*
* @param newValue the new value to attempt
* @return true if the change attempt was successful, false if not. If the change was not
* successful, {@link #getValue()} will return the updated value
* @throws Exception ZK errors, interruptions, etc.
*/
public boolean trySetValue(byte[] newValue) throws Exception {
Preconditions.checkState(state.get() == State.STARTED, "not started");
try {
client.setData().withVersion(stat.getVersion()).forPath(path, newValue);
stat.setVersion(stat.getVersion() + 1);
value = Arrays.copyOf(newValue, newValue.length);
return true;
} catch (KeeperException.BadVersionException ignore) {
// ignore
}
readValue();
return false;
}
