runtime/org.argeo.slc.server/src/main/java/org/argeo/slc/web/mvc/process/SlcExecutionManager.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.web.mvc.process;
  18
  19 import java.io.ByteArrayInputStream;
  20 import java.io.ByteArrayOutputStream;
  21 import java.io.InputStream;
  22 import java.util.UUID;
  23
  24 import javax.xml.transform.stream.StreamSource;
  25
  26 import org.apache.commons.io.IOUtils;
  27 import org.apache.commons.logging.Log;
  28 import org.apache.commons.logging.LogFactory;
  29 import org.argeo.slc.core.attachment.Attachment;
  30 import org.argeo.slc.core.attachment.AttachmentsStorage;
  31 import org.argeo.slc.core.attachment.SimpleAttachment;
  32 import org.argeo.slc.msg.ObjectList;
  33 import org.argeo.slc.process.SlcExecution;
  34 import org.argeo.slc.runtime.SlcAgentFactory;
  35 import org.argeo.slc.services.SlcExecutionService;
  36 import org.springframework.oxm.Marshaller;
  37 import org.springframework.oxm.Unmarshaller;
  38 import org.springframework.xml.transform.StringResult;
  39
  40 public class SlcExecutionManager {
  41         private final static Log log = LogFactory
  42                         .getLog(SlcExecutionManager.class);
  43
  44         private SlcAgentFactory agentFactory;
  45         private Unmarshaller unmarshaller;
  46         private Marshaller marshaller;
  47         private SlcExecutionService slcExecutionService;
  48         private AttachmentsStorage attachmentsStorage;
  49
  50         public SlcExecutionManager(
  51                         SlcAgentFactory agentFactory,
  52                         Unmarshaller unmarshaller,
  53                         Marshaller marshaller,
  54                         SlcExecutionService slcExecutionService,
  55                         AttachmentsStorage attachmentsStorage){
  56
  57         this.agentFactory = agentFactory;
  58         this.unmarshaller = unmarshaller;
  59         this.marshaller = marshaller;
  60         this.slcExecutionService = slcExecutionService;
  61         this.attachmentsStorage = attachmentsStorage;
  62         }
  63
  64
  65         protected void storeRealizedFlows(SlcExecution slcExecution) {
  66
  67                 Attachment attachment = realizedFlowsAttachment(UUID.randomUUID()
  68                                 .toString(), slcExecution);
  69                 InputStream in = null;
  70                 try {
  71                         ObjectList ol = new ObjectList(slcExecution.getRealizedFlows());
  72                         StringResult result = new StringResult();
  73                         marshaller.marshal(ol, result);
  74                         in = new ByteArrayInputStream(result.toString().getBytes());
  75                         attachmentsStorage.storeAttachment(attachment, in);
  76
  77                         slcExecution.setRealizedFlowsXml(attachment.getUuid());
  78                 } catch (Exception e) {
  79                         log.error("Could not store realized flows as attachment #"
  80                                         + attachment.getUuid(), e);
  81                 } finally {
  82                         IOUtils.closeQuietly(in);
  83                 }
  84         }
  85
  86         protected void retrieveRealizedFlows(SlcExecution slcExecution) {
  87                 Attachment attachment = realizedFlowsAttachment(slcExecution.getRealizedFlowsXml(),
  88                                                 slcExecution);
  89
  90                 ByteArrayOutputStream out = null;
  91                 ByteArrayInputStream in = null;
  92                 try {
  93                         // TODO: optimize with piped streams
  94                         out = new ByteArrayOutputStream();
  95                         attachmentsStorage.retrieveAttachment(attachment, out);
  96
  97                         byte[] arr = out.toByteArray();
  98                         in = new ByteArrayInputStream(arr);
  99                         StreamSource source = new StreamSource(in);
 100                         ObjectList ol = (ObjectList) unmarshaller.unmarshal(source);
 101                         ol.fill(slcExecution.getRealizedFlows());
 102                 } catch (Exception e) {
 103                         log.error("Could not retrieve realized flows from attachment #"
 104                                         + attachment.getUuid(), e);
 105                 } finally {
 106                         IOUtils.closeQuietly(in);
 107                         IOUtils.closeQuietly(out);
 108                 }
 109         }
 110
 111         /** Unify labeling in the package */
 112         static Attachment realizedFlowsAttachment(String attachmentUuid,
 113                         SlcExecution slcExecution) {
 114                 return new SimpleAttachment(attachmentUuid,
 115                                 "RealizedFlows of SlcExecution #" + slcExecution.getUuid(),
 116                                 "text/xml");
 117         }
 118 }