flowgenerator.java

bpel执行引擎用来执行bpel业务流程

/*
 * 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.ode.bpel.compiler;

import org.apache.ode.bpel.compiler.api.CompilationException;
import org.apache.ode.bpel.compiler.bom.Activity;
import org.apache.ode.bpel.compiler.bom.CompositeActivity;
import org.apache.ode.bpel.compiler.bom.FlowActivity;
import org.apache.ode.bpel.compiler.bom.Link;
import org.apache.ode.bpel.o.OActivity;
import org.apache.ode.bpel.o.OFlow;
import org.apache.ode.bpel.o.OLink;
import org.apache.ode.utils.msg.MessageBundle;
import org.apache.ode.utils.stl.CollectionsX;
import org.apache.ode.utils.stl.MemberOfFunction;

import java.util.Iterator;


/**
 * Generates code for <code>&lt;flow&gt;</code> activities.
 */
class FlowGenerator extends DefaultActivityGenerator {
    private static final FlowGeneratorMessages __cmsgs = MessageBundle.getMessages(FlowGeneratorMessages.class);

    public void compile(OActivity output, Activity src) {
        FlowActivity flowAct = (FlowActivity)src;
        OFlow oflow = (OFlow) output;
        compileLinkDecls(oflow, flowAct);
        compileChildren(oflow, flowAct);

        for (Iterator<OLink> i = oflow.localLinks.iterator(); i.hasNext(); ) {
            OLink olink = i.next();
            try {
                if (olink.source == null)
                    throw new CompilationException(__cmsgs.errLinkMissingSourceActivity(olink.name).setSource(flowAct));
            } catch (CompilationException ce) {
                _context.recoveredFromError(src, ce);
            }

            try {
                if (olink.target == null)
                    throw new CompilationException(__cmsgs.errLinkMissingTargetActivity(olink.name).setSource(flowAct));
            } catch (CompilationException ce) {
                _context.recoveredFromError(src, ce);
            }
          }
    }


  public OActivity newInstance(Activity src) {
    return new OFlow(_context.getOProcess(),_context.getCurrent());
  }

  private void compileLinkDecls(OFlow oflow, FlowActivity flowAct) {
    for (Link link : flowAct.getLinks()) {
      OLink olink = new OLink(_context.getOProcess());
      olink.name = link.getLinkName();
      declareLink(oflow, olink);
    }
  }


    private void declareLink(final OFlow oflow, final OLink olink) throws CompilationException {
        if (CollectionsX.find_if(oflow.localLinks, new MemberOfFunction<OLink>() {
            public boolean isMember(OLink o) {
                return o.name.equals(olink.name);
            }
        }) != null)
            throw new CompilationException(__cmsgs.errDuplicateLinkDecl(olink.name));

        olink.declaringFlow = oflow;
        oflow.localLinks.add(olink);
    }

  /**
   */
  protected void compileChildren(OFlow dest, CompositeActivity src) {
    for (Activity child : src.getActivities()){
      try {
        OActivity compiledChild = _context.compile(child);
        dest.parallelActivities.add(compiledChild);
      } catch (CompilationException ce) {
        _context.recoveredFromError(child, ce);
      }
    }
  }
}