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/**
 * Copyright [2009-2010] [dennis zhuang([email protected])] 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
 */
/**
 * Copyright [2009-2010] [dennis zhuang([email protected])] 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 com.google.code.yanf4j.statistics.impl;

import java.util.concurrent.atomic.AtomicLong;
import com.google.code.yanf4j.statistics.Statistics;

/**
 * A simple statistics implementation
 * 
 * @author dennis
 * 
 */
public class SimpleStatistics implements Statistics {
  private boolean started = false;

  public boolean isStatistics() {
    return this.started;
  }

  public synchronized void reset() {
    if (this.started) {
      throw new IllegalStateException();
    }
    this.startTime = this.stopTime = -1;
    this.recvMessageCount.set(0);
    this.recvMessageTotalSize.set(0);
    this.writeMessageCount.set(0);
    this.writeMessageTotalSize.set(0);
    this.processMessageCount.set(0);
    this.processMessageTotalTime.set(0);
    this.acceptCount.set(0);
  }

  private double receiveThroughputLimit = -1.0; // receive bytes per second
  private double sendThroughputLimit = -1.0; // send bytes per second

  public void setReceiveThroughputLimit(double receivePacketRate) {
    this.receiveThroughputLimit = receivePacketRate;
  }

  /**
   * Check session if receive bytes per second is over flow controll
   * 
   * @return
   */
  public boolean isReceiveOverFlow() {
    if (getReceiveThroughputLimit() < 0.0000f) {
      return false;
    }
    return getReceiveBytesPerSecond() > getReceiveThroughputLimit();
  }

  /**
   * Check session if receive bytes per second is over flow controll
   * 
   * @return
   */
  public boolean isSendOverFlow() {
    if (getSendThroughputLimit() < 0.0000f) {
      return false;
    }
    return getSendBytesPerSecond() > getSendThroughputLimit();
  }

  public double getSendThroughputLimit() {
    return this.sendThroughputLimit;
  }

  public void setSendThroughputLimit(double sendThroughputLimit) {
    this.sendThroughputLimit = sendThroughputLimit;
  }

  public final double getReceiveThroughputLimit() {
    return this.receiveThroughputLimit;
  }

  public synchronized void restart() {
    stop();
    reset();
    start();
  }

  private long startTime, stopTime = -1;

  private AtomicLong recvMessageCount = new AtomicLong();

  private AtomicLong recvMessageTotalSize = new AtomicLong();

  private AtomicLong writeMessageCount = new AtomicLong();

  private AtomicLong writeMessageTotalSize = new AtomicLong();

  private AtomicLong processMessageCount = new AtomicLong();

  private AtomicLong acceptCount = new AtomicLong();

  private AtomicLong processMessageTotalTime = new AtomicLong();

  public long getStartedTime() {
    return this.startTime;
  }

  public double getProcessedMessageAverageTime() {
    return this.processMessageCount.get() == 0 ? 0
        : (double) this.processMessageTotalTime.get() / this.processMessageCount.get();
  }

  public long getProcessedMessageCount() {
    return this.processMessageCount.get();
  }

  public void statisticsProcess(long n) {
    if (!this.started) {
      return;
    }
    if (n < 0) {
      return;
    }
    this.processMessageTotalTime.addAndGet(n);
    this.processMessageCount.incrementAndGet();
  }

  public SimpleStatistics() {

  }

  public synchronized void start() {
    this.startTime = System.currentTimeMillis();
    this.started = true;
  }

  public synchronized void stop() {
    this.stopTime = System.currentTimeMillis();
    this.started = false;
  }

  public void statisticsRead(long n) {
    if (!this.started) {
      return;
    }
    if (n <= 0) {
      return;
    }
    this.recvMessageCount.incrementAndGet();
    this.recvMessageTotalSize.addAndGet(n);
  }

  public long getRecvMessageCount() {
    return this.recvMessageCount.get();
  }

  public long getRecvMessageTotalSize() {
    return this.recvMessageTotalSize.get();
  }

  public long getWriteMessageCount() {
    return this.writeMessageCount.get();
  }

  public long getWriteMessageTotalSize() {
    return this.writeMessageTotalSize.get();
  }

  public void statisticsWrite(long n) {
    if (!this.started) {
      return;
    }
    if (n <= 0) {
      return;
    }
    this.writeMessageCount.incrementAndGet();
    this.writeMessageTotalSize.addAndGet(n);
  }

  public long getRecvMessageAverageSize() {
    return this.recvMessageCount.get() == 0 ? 0
        : this.recvMessageTotalSize.get() / this.recvMessageCount.get();
  }

  public double getRecvMessageCountPerSecond() {
    long duration = (this.stopTime == -1) ? (System.currentTimeMillis() - this.startTime)
        : (this.stopTime - this.startTime);
    return duration == 0 ? 0 : (double) this.recvMessageCount.get() * 1000 / duration;
  }

  public double getWriteMessageCountPerSecond() {
    long duration = (this.stopTime == -1) ? (System.currentTimeMillis() - this.startTime)
        : (this.stopTime - this.startTime);
    return duration == 0 ? 0 : (double) this.writeMessageCount.get() * 1000 / duration;
  }

  public long getWriteMessageAverageSize() {
    return this.writeMessageCount.get() == 0 ? 0
        : this.writeMessageTotalSize.get() / this.writeMessageCount.get();
  }

  public double getAcceptCountPerSecond() {
    long duration = (this.stopTime == -1) ? (System.currentTimeMillis() - this.startTime)
        : (this.stopTime - this.startTime);
    return duration == 0 ? 0 : (double) this.acceptCount.get() * 1000 / duration;
  }

  public double getReceiveBytesPerSecond() {
    long duration = (this.stopTime == -1) ? (System.currentTimeMillis() - this.startTime)
        : (this.stopTime - this.startTime);
    return duration == 0 ? 0 : (double) this.recvMessageTotalSize.get() * 1000 / duration;
  }

  public double getSendBytesPerSecond() {
    long duration = (this.stopTime == -1) ? (System.currentTimeMillis() - this.startTime)
        : (this.stopTime - this.startTime);
    return duration == 0 ? 0 : (double) this.writeMessageTotalSize.get() * 1000 / duration;
  }

  public void statisticsAccept() {
    if (!this.started) {
      return;
    }
    this.acceptCount.incrementAndGet();
  }

}