Question

所以，我正在开发一个插件工作，我遇到了一个可以使用ContentProposalAdapter的情况。基本上，一个人将开始输入某人的名字，然后将以提前输入方式（la Google）返回与当前查询匹配的名称列表。因此，我创建了一个类IContentProposalProvider，在调用它时，它的getProposals（）方法会触发一个处理在后台获取提案的线程。我遇到的问题是我遇到竞争状态，通过HTTP获取提案的处理发生了，我尝试在实际检索之前获取提案。

现在，我正试图不要遇到线程地狱的问题，不管怎么说，这并没有让我走得太远。所以，这是我到目前为止所做的。有没有人对我能做什么有任何建议？

public class ProfilesProposalProvider implements IContentProposalProvider, PropertyChangeListener {

     private IContentProposal[] props;

     @Override
     public IContentProposal[] getProposals(String arg0, int arg1) {
      Display display = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell().getDisplay();

      RunProfilesJobThread t1 = new RunProfilesJobThread(arg0, display);
      t1.run();

      return props;
     }

     @Override
     public void propertyChange(PropertyChangeEvent arg0) {
      if (arg0.getSource() instanceof RunProfilesJobThread){
       RunProfilesJobThread thread = (RunProfilesJobThread)arg0.getSource();
       props = thread.getProps();

      }
     }
    }



public class RunProfilesJobThread extends Thread {

 private ProfileProposal[] props;
 private Display display;
 private String query;

 public RunProfilesJobThread(String query, Display display){
  this.query = query;
 }

 @Override
 public void run() {
  if (!(query.equals(""))){
   GetProfilesJob job = new GetProfilesJob("profiles", query);
   job.schedule();

   try {
    job.join();
   } catch (InterruptedException e) {
    e.printStackTrace();
   }

   GetProfilesJobInfoThread thread = new GetProfilesJobInfoThread(job.getResults());

   try {
    thread.join();
   } catch (InterruptedException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }


   props = thread.getProps();
  }
 }

 public ProfileProposal[] getProps(){
  return props;
 }
}

public class GetProfilesJobInfoThread extends Thread {

     private ArrayList<String> names;
     private ProfileProposal[] props;

     public GetProfilesJobInfoThread(ArrayList<String> names){
      this.names = names;
     }

     @Override
     public void run() {
      if (names != null){
       props = new ProfileProposal[names.size()];
       for (int i = 0; i < props.length - 1; i++){
        ProfileProposal temp = new ProfileProposal(names.get(i), names.get(i));
        props[i] = temp;
       }
      }
     }

     public ProfileProposal[] getProps(){
      return props;
     }
    }

Answer 1

好的，我会试一试......

我没有尝试过运行它，但它应该或多或少地运行。至少这是一个好的开始。如果您有任何疑问，请随时提出。

public class ProfilesProposalProvider implements IContentProposalProvider {
    private List<IContentProposal> proposals;
    private String proposalQuery;
    private Thread retrievalThread;

    public void setProposals( List<IContentProposal> proposals, String query ) {
        synchronized( this ) {
            this.proposals = proposals;
            this.proposalQuery = query;
        }
    }

    public IContentProposal[] getProposals( String contents, int position ) {
        // Synchronize incoming thread and retrieval thread, so that the proposal list
        // is not replaced while we're processing it.
        synchronized( this ) {
            /**
             * Get proposals if query is longer than one char, or if the current list of proposals does with a different
             * prefix than the new query, and only if the current retrieval thread is finished.
             */
            if ( retrievalThread == null && contents.length() > 1 && ( proposals == null || !contents.startsWith( proposalQuery ) ) ) {
                getProposals( contents );
            }

            /**
             * Select valid proposals from retrieved list.
             */
            if ( proposals != null ) {
                List<IContentProposal> validProposals = new ArrayList<IContentProposal>();
                for ( IContentProposal prop : proposals ) {
                    if(prop == null) {
                        continue;
                    }
                    String propVal = prop.getContent();
                    if ( isProposalValid( propVal, contents )) {
                        validProposals.add( prop );
                    }
                }
                return validProposals.toArray( new IContentProposal[ validProposals.size() ] );
            }
        }

        return new IContentProposal[0];
    }

    protected void getProposals( final String query ) {
        retrievalThread = new Thread() {
            @Override
            public void run() {
                GetProfilesJob job = new GetProfilesJob("profiles", query);
                job.schedule();

                try {
                    job.join();

                    ArrayList<String> names = job.getResults();
                    if (names != null){
                        List<IContentProposal> props = new ArrayList<IContentProposal>();
                        for ( String name : names ) {
                            props.add( new ProfileProposal( name, name ) );
                        }
                        setProposals( props, query );
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                retrievalThread = null;
            }
        };
        retrievalThread.start();
    }

    protected boolean isProposalValid( String proposalValue, String contents ) {
        return ( proposalValue.length() >= contents.length() && proposalValue.substring(0, contents.length()).equalsIgnoreCase(contents));
    }
}

如何从互联网上填充JFace ContentProposalAdapter？

1 个答案: