/**
* This methods main purpose is to support browser history.
*
* <p>When the browsers back or forward buttons are pressed, a re-search /might/ be required -
* namely if the query changes. So, as the UI requests updates of the page (show,facets, etc) this
* method checks if a search must be executed before those updates are performed.
*
* <p>It will consequently also run a search if the UI updates a search parameter without actually
* explicitly executing the search before setting of the polling.
*
* @see {@link com.indexdata.mkjsf.pazpar2.state.StateManager#setCurrentStateKey}
* @param commands
*/
protected void handleQueryStateChanges(String commands) {
if (stateMgr.hasPendingStateChange("search") && hasQuery()) {
logger.info(
"Triggered search: Found pending search change ["
+ pzreq.getCommand("search").toString()
+ "], doing search before updating "
+ commands);
pzreq.getSearch().run();
pzresp.getSearch().setIsNew(false);
}
if (stateMgr.hasPendingStateChange("record") && !commands.equals("record")) {
logger.debug("Found pending record ID change. Doing record before updating " + commands);
stateMgr.hasPendingStateChange("record", false);
pzreq.getRecord().run();
}
}
protected boolean hasQuery() {
return pzreq.getCommand("search").hasParameterValue("query");
}
/**
* Resolves whether the back-end has a record with the given recid in memory
*
* @return true if the bean currently holds the record with recid
*/
public boolean hasRecord(String recId) {
return pzreq.getCommand("record").hasParameters()
&& pzresp.getRecord().getRecId().equals(recId);
}
/**
* Simultaneously refreshes the data objects listed in 'commands' from pazpar2, potentially
* running a search or a record command first if any of these two commands have outstanding
* parameter changes.
*
* @param commands, a comma-separated list of Pazpar2 commands to execute
* @return Number of activeclients at the time of the 'show' command, or 'new' if search was just
* initiated.
*/
public String update(String commands) {
logger.debug("Request to update: " + commands);
try {
if (commands.equals("search")) {
pzreq.getSearch().run();
pzresp.getSearch().setIsNew(false);
return "new";
} else if (commands.equals("record")) {
pzreq.getRecord().run();
return pzresp.getRecord().getActiveClients();
} else if (pzresp.getSearch().isNew()) {
// For returning notification of 'search started' quickly to UI
logger.info(
"New search. Marking it old, then returning 'new' to trigger another round-trip.");
pzresp.getSearch().setIsNew(false);
return "new";
} else {
handleQueryStateChanges(commands);
if (pzresp.getSearch().hasApplicationError()) {
logger.error(
"The command(s) "
+ commands
+ " cancelled because the latest search command had an error.");
return "0";
} else if (errors.hasConfigurationErrors()) {
logger.error("The command(s) " + commands + " cancelled due to configuration errors.");
return "0";
} else {
logger.debug("Processing request for " + commands);
List<CommandThread> threadList = new ArrayList<CommandThread>();
StringTokenizer tokens = new StringTokenizer(commands, ",");
while (tokens.hasMoreElements()) {
threadList.add(
new CommandThread(
pzreq.getCommand(tokens.nextToken()),
searchClient,
Pz2Service.get().getPzresp()));
}
for (CommandThread thread : threadList) {
thread.start();
}
for (CommandThread thread : threadList) {
try {
thread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
return pzresp.getActiveClients();
}
}
} catch (ClassCastException cce) {
cce.printStackTrace();
return "";
} catch (NullPointerException npe) {
npe.printStackTrace();
return "";
} catch (Exception e) {
e.printStackTrace();
return "";
}
}