/**
* Copyright (C) 2012 JBoss Inc
*
* Licensed 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.jboss.dashboard.ui.controller.requestChain;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import org.jboss.dashboard.profiler.memory.MemoryProfiler;
import org.jboss.dashboard.ui.components.ControllerStatus;
import org.jboss.dashboard.ui.controller.CommandRequest;
import org.jboss.dashboard.ui.controller.responses.SendErrorResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Analyzes the memory available on every incoming request and it tries to free memory if required.
*/
@ApplicationScoped
public class FreeMemoryProcessor implements RequestChainProcessor {
@Inject
private transient Logger log;
public boolean processRequest(CommandRequest request) throws Exception {
MemoryProfiler memoryProfiler = MemoryProfiler.lookup();
if (memoryProfiler.isLowMemory()) {
log.warn("Memory is running low ...");
memoryProfiler.freeMemory();
if (memoryProfiler.isLowMemory()) {
ControllerStatus controllerStatus = ControllerStatus.lookup();
controllerStatus.setResponse(new SendErrorResponse(503));
controllerStatus.consumeURIPart(controllerStatus.getURIToBeConsumed());
log.error("Memory is so low that the request had to be canceled - 503 sent. Consider increasing the JVM memory.");
return false;
}
}
return true;
}
}