/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.artemis.core.client.impl;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import org.apache.activemq.artemis.api.core.SimpleString;
import org.apache.activemq.artemis.spi.core.remoting.SessionContext;
public class ClientProducerCreditManagerImpl implements ClientProducerCreditManager {
public static final int MAX_UNREFERENCED_CREDITS_CACHE_SIZE = 1000;
private final Map<SimpleString, ClientProducerCredits> producerCredits = new LinkedHashMap<>();
private final Map<SimpleString, ClientProducerCredits> unReferencedCredits = new LinkedHashMap<>();
private final ClientSessionInternal session;
private int windowSize;
public ClientProducerCreditManagerImpl(final ClientSessionInternal session, final int windowSize) {
this.session = session;
this.windowSize = windowSize;
}
@Override
public synchronized ClientProducerCredits getCredits(final SimpleString address,
final boolean anon,
SessionContext context) {
if (windowSize == -1) {
return ClientProducerCreditsNoFlowControl.instance;
} else {
boolean needInit = false;
ClientProducerCredits credits;
synchronized (this) {
credits = producerCredits.get(address);
if (credits == null) {
// Doesn't need to be fair since session is single threaded
credits = new ClientProducerCreditsImpl(session, address, windowSize);
needInit = true;
producerCredits.put(address, credits);
}
if (!anon) {
credits.incrementRefCount();
// Remove from anon credits (if there)
unReferencedCredits.remove(address);
} else {
addToUnReferencedCache(address, credits);
}
}
// The init is done outside of the lock
// otherwise packages may arrive with flow control
// while this is still sending requests causing a dead lock
if (needInit) {
credits.init(context);
}
return credits;
}
}
@Override
public synchronized void returnCredits(final SimpleString address) {
ClientProducerCredits credits = producerCredits.get(address);
if (credits != null && credits.decrementRefCount() == 0) {
addToUnReferencedCache(address, credits);
}
}
@Override
public synchronized void receiveCredits(final SimpleString address, final int credits) {
ClientProducerCredits cr = producerCredits.get(address);
if (cr != null) {
cr.receiveCredits(credits);
}
}
@Override
public synchronized void receiveFailCredits(final SimpleString address, int credits) {
ClientProducerCredits cr = producerCredits.get(address);
if (cr != null) {
cr.receiveFailCredits(credits);
}
}
@Override
public synchronized void reset() {
for (ClientProducerCredits credits : producerCredits.values()) {
credits.reset();
}
}
@Override
public synchronized void close() {
windowSize = -1;
for (ClientProducerCredits credits : producerCredits.values()) {
credits.close();
}
producerCredits.clear();
unReferencedCredits.clear();
}
@Override
public synchronized int creditsMapSize() {
return producerCredits.size();
}
@Override
public synchronized int unReferencedCreditsSize() {
return unReferencedCredits.size();
}
private void addToUnReferencedCache(final SimpleString address, final ClientProducerCredits credits) {
unReferencedCredits.put(address, credits);
if (unReferencedCredits.size() > MAX_UNREFERENCED_CREDITS_CACHE_SIZE) {
// Remove the oldest entry
Iterator<Map.Entry<SimpleString, ClientProducerCredits>> iter = unReferencedCredits.entrySet().iterator();
Map.Entry<SimpleString, ClientProducerCredits> oldest = iter.next();
iter.remove();
removeEntry(oldest.getKey(), oldest.getValue());
}
}
private void removeEntry(final SimpleString address, final ClientProducerCredits credits) {
producerCredits.remove(address);
credits.releaseOutstanding();
credits.close();
}
static class ClientProducerCreditsNoFlowControl implements ClientProducerCredits {
static ClientProducerCreditsNoFlowControl instance = new ClientProducerCreditsNoFlowControl();
@Override
public void acquireCredits(int credits) {
}
@Override
public void receiveCredits(int credits) {
}
@Override
public void receiveFailCredits(int credits) {
}
@Override
public boolean isBlocked() {
return false;
}
@Override
public void init(SessionContext ctx) {
}
@Override
public void reset() {
}
@Override
public void close() {
}
@Override
public void incrementRefCount() {
}
@Override
public int decrementRefCount() {
return 1;
}
@Override
public void releaseOutstanding() {
}
}
}