AgentServiceImpl.java

   1 /*
   2  * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.argeo.slc.services.impl;
  18
  19 import java.util.ArrayList;
  20 import java.util.List;
  21 import java.util.concurrent.Executor;
  22
  23 import org.apache.commons.logging.Log;
  24 import org.apache.commons.logging.LogFactory;
  25 import org.argeo.security.ArgeoSecurityService;
  26 import org.argeo.slc.dao.runtime.SlcAgentDescriptorDao;
  27 import org.argeo.slc.runtime.SlcAgent;
  28 import org.argeo.slc.runtime.SlcAgentDescriptor;
  29 import org.argeo.slc.runtime.SlcAgentFactory;
  30 import org.argeo.slc.services.AgentService;
  31 import org.springframework.beans.factory.DisposableBean;
  32 import org.springframework.beans.factory.InitializingBean;
  33
  34 public class AgentServiceImpl implements AgentService, InitializingBean,
  35                 DisposableBean {
  36         private final static Log log = LogFactory.getLog(AgentServiceImpl.class);
  37
  38         private final SlcAgentDescriptorDao slcAgentDescriptorDao;
  39         private final SlcAgentFactory agentFactory;
  40
  41         private Executor securityService;
  42
  43         private Long pingCycle = 20000l;
  44
  45         private Boolean pingThreadActive = true;
  46
  47         public AgentServiceImpl(SlcAgentDescriptorDao slcAgentDescriptorDao,
  48                         SlcAgentFactory agentFactory) {
  49                 this.slcAgentDescriptorDao = slcAgentDescriptorDao;
  50                 this.agentFactory = agentFactory;
  51         }
  52
  53         public void register(SlcAgentDescriptor slcAgentDescriptor) {
  54                 if (slcAgentDescriptorDao.getAgentDescriptor(slcAgentDescriptor
  55                                 .getUuid()) == null)
  56                         slcAgentDescriptorDao.create(slcAgentDescriptor);
  57                 log.info("Registered agent #" + slcAgentDescriptor.getUuid());
  58         }
  59
  60         public void unregister(SlcAgentDescriptor slcAgentDescriptor) {
  61                 slcAgentDescriptorDao.delete(slcAgentDescriptor);
  62                 log.info("Unregistered agent #" + slcAgentDescriptor.getUuid());
  63         }
  64
  65         public void afterPropertiesSet() throws Exception {
  66                 // if (pingCycle > 0)
  67                 // new PingThread().start();
  68                 if (pingCycle > 0) {
  69                         Thread authenticatedThread = new Thread("SLC Agents Ping") {
  70                                 public void run() {
  71                                         securityService.execute(new AgentsPing());
  72                                 }
  73                         };
  74                         authenticatedThread.start();
  75
  76                 }
  77         }
  78
  79         public synchronized void destroy() throws Exception {
  80                 pingThreadActive = false;
  81                 notifyAll();
  82         }
  83
  84         public void setPingCycle(Long pingCycle) {
  85                 this.pingCycle = pingCycle;
  86         }
  87
  88         public void setSecurityService(Executor securityService) {
  89                 this.securityService = securityService;
  90         }
  91
  92         protected class AgentsPing implements Runnable {
  93                 public void run() {
  94
  95                         // FIXME: temporary hack so that the ping starts after the server
  96                         // has been properly started.
  97                         try {
  98                                 Thread.sleep(10 * 1000);
  99                         } catch (InterruptedException e1) {
 100                                 // silent
 101                         }
 102
 103                         log.info("Start pinging agents.");
 104                         while (pingThreadActive) {
 105                                 List<SlcAgentDescriptor> lst = slcAgentDescriptorDao
 106                                                 .listSlcAgentDescriptors();
 107                                 List<String> agentIds = new ArrayList<String>();
 108                                 for (SlcAgentDescriptor ad : lst)
 109                                         agentIds.add(ad.getUuid());
 110
 111                                 if (log.isTraceEnabled())
 112                                         log.trace("Ping " + agentIds.size() + " agent(s).");
 113                                 for (String agentId : agentIds) {
 114                                         SlcAgent agent = agentFactory.getAgent(agentId);
 115                                         if (!agent.ping()) {
 116                                                 log.info("Agent " + agentId + " did not reply to ping,"
 117                                                                 + " removing its descriptor...");
 118                                                 slcAgentDescriptorDao.delete(agentId);
 119                                         }
 120                                 }
 121
 122                                 lst = slcAgentDescriptorDao.listSlcAgentDescriptors();
 123                                 agentIds = new ArrayList<String>();
 124                                 for (SlcAgentDescriptor ad : lst)
 125                                         agentIds.add(ad.getUuid());
 126                                 agentFactory.pingAll(agentIds);
 127
 128                                 synchronized (AgentServiceImpl.this) {
 129                                         try {
 130                                                 AgentServiceImpl.this.wait(pingCycle);
 131                                         } catch (InterruptedException e) {
 132                                                 // silent
 133                                         }
 134                                 }
 135                         }
 136                         log.info("Stopped pinging agents.");
 137                 }
 138
 139         }
 140
 141 }