geode-core/src/main/java/org/apache/geode/internal/admin/remote/ObjectNamesResponse.java

/*
 * 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.geode.internal.admin.remote;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import org.apache.geode.DataSerializer;
import org.apache.geode.cache.Region;
import org.apache.geode.distributed.internal.DistributionManager;
import org.apache.geode.distributed.internal.membership.InternalDistributedMember;

/**
 * Responds to {@link ObjectNamesResponse}.
 */
public class ObjectNamesResponse extends AdminResponse implements Cancellable {
  // instance variables
  private HashSet objectNames;
  private transient boolean cancelled;

  /**
   * Returns a <code>ObjectNamesResponse</code> that will be returned to the specified recipient.
   * The message will contains a copy of the local manager's system config.
   */
  public static ObjectNamesResponse create(DistributionManager dm,
      InternalDistributedMember recipient) {
    ObjectNamesResponse m = new ObjectNamesResponse();
    m.setRecipient(recipient);
    return m;
  }

  public void buildNames(Region r) {
    if (cancelled) {
      return;
    }

    Set nameSet = r.keySet();
    Iterator it = nameSet.iterator();
    objectNames = new HashSet();
    synchronized (r) {
      while (it.hasNext()) {
        if (cancelled) {
          break;
        }
        Object name = it.next();
        if (name instanceof String || name instanceof Number) {
          objectNames.add(name);
        } else {
          objectNames.add(new RemoteObjectName(name));
        }
      }
    }
  }

  @Override
  public synchronized void cancel() {
    cancelled = true;
  }

  // instance methods
  public Set getNameSet() {
    return new HashSet(this.objectNames);
  }

  @Override
  public int getDSFID() {
    return OBJECT_NAMES_RESPONSE;
  }

  @Override
  public void toData(DataOutput out) throws IOException {
    super.toData(out);
    DataSerializer.writeObject(this.objectNames, out);
  }

  @Override
  public void fromData(DataInput in) throws IOException, ClassNotFoundException {
    super.fromData(in);
    this.objectNames = (HashSet) DataSerializer.readObject(in);
  }

  @Override
  public String toString() {
    return "ObjectNamesResponse from " + this.getRecipient();
  }
}