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/*
* @(#)InterestStore.java 1.35 08/28/07
*/
package com.sun.messaging.jmq.jmsserver.persist.inmemory;
import com.sun.messaging.jmq.jmsserver.core.ConsumerUID;
import com.sun.messaging.jmq.jmsserver.core.Consumer;
import com.sun.messaging.jmq.util.log.Logger;
import com.sun.messaging.jmq.jmsserver.util.*;
import com.sun.messaging.jmq.jmsserver.Globals;
import com.sun.messaging.jmq.jmsserver.resources.*;
import com.sun.messaging.jmq.jmsserver.persist.Store;
import java.io.*;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
/**
* Keep track of all persisted Interest objects
*/
class InterestStore {
Logger logger = Globals.getLogger();
BrokerResources br = Globals.getBrokerResources();
// cache of all stored interests; maps interest id -> interest
private ConcurrentHashMap interestMap = null;
/**
* When instantiated, all interests are loaded.
*/
InterestStore() {
interestMap = new ConcurrentHashMap(256);
}
/**
* Get debug information about the store.
* @return A Hashtable of name value pair of information
*/
Hashtable getDebugState() {
Hashtable t = new Hashtable();
t.put("Consumers", String.valueOf(interestMap.size()));
return t;
}
/**
* Print out usage info in the interest directory.
*/
public void printInfo(PrintStream out) {
out.println("\nInterests");
out.println("---------");
out.println("number of interests: " + interestMap.size());
}
/**
* Store an interest which is uniquely identified by it's interest id.
*
* @param interest interest to be persisted
* @exception java.io.IOException if an error occurs while persisting the interest
* @exception BrokerException if an interest with the same id exists
* in the store already
*/
void storeInterest(Consumer interest)
throws IOException, BrokerException {
ConsumerUID id = interest.getConsumerUID();
try {
Object oldValue = interestMap.putIfAbsent(id, interest);
if (oldValue != null) {
logger.log(Logger.ERROR,
BrokerResources.E_INTEREST_EXISTS_IN_STORE, id,
interest.getDestinationUID().getLongString());
throw new BrokerException(
br.getString(BrokerResources.E_INTEREST_EXISTS_IN_STORE, id,
interest.getDestinationUID().getLongString()));
}
} catch (RuntimeException e) {
logger.log(Logger.ERROR, BrokerResources.X_PERSIST_INTEREST_FAILED, id, e);
throw e;
}
}
/**
* Remove the interest from the persistent store.
*
* @param interest the interest to be removed
* @exception java.io.IOException if an error occurs while removing the interest
* @exception BrokerException if the interest is not found in the store
*/
void removeInterest(Consumer interest)
throws IOException, BrokerException {
Object oldinterest = null;
ConsumerUID id = interest.getConsumerUID();
try {
oldinterest = interestMap.remove(id);
if (oldinterest == null) {
logger.log(Logger.ERROR,
BrokerResources.E_INTEREST_NOT_FOUND_IN_STORE, id,
interest.getDestinationUID().getLongString());
throw new BrokerException(
br.getString(BrokerResources.E_INTEREST_NOT_FOUND_IN_STORE,
id, interest.getDestinationUID().getLongString()));
}
} catch (RuntimeException e) {
logger.log(Logger.ERROR, BrokerResources.X_REMOVE_INTEREST_FAILED, id);
throw new BrokerException(
br.getString(BrokerResources.X_REMOVE_INTEREST_FAILED, id), e);
}
}
/**
* Retrieve all interests in the store.
* Will return as many interests as we can read.
* Any interests that are retrieved unsuccessfully will be logged as a
* warning.
*
* @return an array of Interest objects; a zero length array is
* returned if no interests exist in the store
* @exception java.io.IOException if an error occurs while getting the data
*/
Consumer[] getAllInterests() throws IOException {
return (Consumer[])interestMap.values().toArray(new Consumer[0]);
}
// clear the store; when this method returns, the store has a state
// that is the same as an empty store (same as when InterestStore
// is instantiated with the clear argument set to true
void clearAll() {
if (Store.getDEBUG()) {
logger.log(Logger.DEBUGHIGH, "InterestStore.clearAll() called");
}
interestMap.clear();
}
void close(boolean cleanup) {
if (Store.getDEBUG()) {
logger.log(Logger.DEBUGHIGH,
"InterestStore: closing, " + interestMap.size() +
" in-memory interests");
}
interestMap.clear();
}
}