ChannelMap.java

/*
 * Copyright 2014-2016 CyberVision, Inc.
 *
 * Licensed 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.kaaproject.kaa.server.operations.service.akka.actors.core.endpoint.local;

import org.kaaproject.kaa.common.TransportType;
import org.kaaproject.kaa.server.operations.pojo.SyncContext;
import org.kaaproject.kaa.server.operations.service.akka.messages.core.endpoint.SyncRequestMessage;
import org.kaaproject.kaa.server.sync.ClientSync;
import org.kaaproject.kaa.server.transport.channel.ChannelContext;
import org.kaaproject.kaa.server.transport.channel.ChannelType;
import org.kaaproject.kaa.server.transport.session.SessionInfo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;

public class ChannelMap {

  private static final Logger LOG = LoggerFactory.getLogger(ChannelMap.class);

  private final String endpointKey;
  private final String actorKey;
  private final Map<UUID, ChannelMetaData> map;

  protected ChannelMap(String endpointKey, String actorKey) {
    super();
    this.endpointKey = endpointKey;
    this.actorKey = actorKey;
    this.map = new HashMap<>();
  }

  /**
   * Get channel meta data by id.
   *
   * @param id the uniq identifier of channel meta data
   */
  public ChannelMetaData getById(UUID id) {
    return this.map.get(id);
  }


  /**
   * Get channel meta data by uniq identifier of request message.
   *
   * @param id the id of request message
   */
  public ChannelMetaData getByRequestId(UUID id) {
    for (ChannelMetaData data : this.map.values()) {
      if (data.getRequestMessage().getChannelUuid().equals(id)) {
        return data;
      }
    }
    return null;
  }

  /**
   * Add new channel.
   *
   * @param data the channel meta data
   */
  public void addChannel(ChannelMetaData data) {
    this.map.put(data.getId(), data);
    LOG.debug("[{}][{}] Added new channel {} to the map. Channel map size: {}",
        endpointKey, actorKey, data, map.size());
  }

  /**
   * Remove exited channel.
   *
   * @param channel the channel meta data
   */
  public void removeChannel(ChannelMetaData channel) {
    this.map.remove(channel.getId());
    LOG.debug("[{}][{}] Removed channel [{}] from the map. Channel map size: {}",
        endpointKey, actorKey, channel.getId(), map.size());
  }

  /**
   * Gets list of channels' meta data by transport type.
   *
   * @param type the transport type of channel
   * @return the by transport type
   */
  public List<ChannelMetaData> getByTransportType(TransportType type) {
    List<ChannelMetaData> result = new ArrayList<>();
    for (ChannelMetaData data : map.values()) {
      if (data.getRequestMessage().isValid(type)) {
        result.add(data);
      }
    }
    return result;
  }

  public boolean isEmpty() {
    return map.isEmpty();
  }

  static final class ChannelMetaData {
    private final SessionInfo session;
    SyncRequestMessage request;
    SyncContext response;
    private long lastActivityTime;

    public ChannelMetaData(SyncRequestMessage request) {
      this(request, null);
    }

    private ChannelMetaData(SyncRequestMessage request, SyncContext response) {
      super();
      this.session = request.getSession();
      this.request = request;
      this.response = response;
    }

    public ClientSync mergeRequest(SyncRequestMessage syncRequest) {
      return this.request.merge(syncRequest);
    }

    public void update(SyncContext response) {
      this.request.updateRequest(response.getResponse());
      this.response = response;
    }

    public UUID getId() {
      return session.getUuid();
    }

    public ChannelType getType() {
      return session.getChannelType();
    }

    public ChannelContext getContext() {
      return session.getCtx();
    }

    public int getKeepAlive() {
      return session.getKeepAlive();
    }

    public SyncRequestMessage getRequestMessage() {
      return request;
    }

    public SyncContext getResponseHolder() {
      return response;
    }

    public long getLastActivityTime() {
      return lastActivityTime;
    }

    public void setLastActivityTime(long lastActivityTime) {
      this.lastActivityTime = lastActivityTime;
    }

    @Override
    public int hashCode() {
      final int prime = 31;
      int result = 1;
      result = prime * result + ((session == null) ? 0 : session.hashCode());
      return result;
    }

    @Override
    public boolean equals(Object obj) {
      if (this == obj) {
        return true;
      }
      if (obj == null) {
        return false;
      }
      if (getClass() != obj.getClass()) {
        return false;
      }
      ChannelMetaData other = (ChannelMetaData) obj;
      if (session == null) {
        if (other.session != null) {
          return false;
        }
      } else if (!session.equals(other.session)) {
        return false;
      }
      return true;
    }

    @Override
    public String toString() {
      StringBuilder builder = new StringBuilder();
      builder.append("ChannelMetaData [session=");
      builder.append(session);
      builder.append("]");
      return builder.toString();
    }

    public boolean isFirstRequest() {
      return response == null;
    }
  }
}