goog.provide("goog.structs.Pool");
goog.require("goog.Disposable");
goog.require("goog.structs.Queue");
goog.require("goog.structs.Set");
goog.structs.Pool = function(opt_minCount, opt_maxCount) {
  goog.Disposable.call(this);
  this.minCount_ = opt_minCount || 0;
  this.maxCount_ = opt_maxCount || 10;
  if (this.minCount_ > this.maxCount_) {
    throw new Error(goog.structs.Pool.ERROR_MIN_MAX_);
  }
  this.freeQueue_ = new goog.structs.Queue();
  this.inUseSet_ = new goog.structs.Set();
  this.delay = 0;
  this.lastAccess = null;
  this.adjustForMinMax();
};
goog.inherits(goog.structs.Pool, goog.Disposable);
goog.structs.Pool.ERROR_MIN_MAX_ = "[goog.structs.Pool] Min can not be greater than max";
goog.structs.Pool.ERROR_DISPOSE_UNRELEASED_OBJS_ = "[goog.structs.Pool] Objects not released";
goog.structs.Pool.prototype.setMinimumCount = function(min) {
  if (min > this.maxCount_) {
    throw new Error(goog.structs.Pool.ERROR_MIN_MAX_);
  }
  this.minCount_ = min;
  this.adjustForMinMax();
};
goog.structs.Pool.prototype.setMaximumCount = function(max) {
  if (max < this.minCount_) {
    throw new Error(goog.structs.Pool.ERROR_MIN_MAX_);
  }
  this.maxCount_ = max;
  this.adjustForMinMax();
};
goog.structs.Pool.prototype.setDelay = function(delay) {
  this.delay = delay;
};
goog.structs.Pool.prototype.getObject = function() {
  var time = Date.now();
  if (this.lastAccess != null && time - this.lastAccess < this.delay) {
    return undefined;
  }
  var obj = this.removeFreeObject_();
  if (obj) {
    this.lastAccess = time;
    this.inUseSet_.add(obj);
  }
  return obj;
};
goog.structs.Pool.prototype.releaseObject = function(obj) {
  if (this.inUseSet_.remove(obj)) {
    this.addFreeObject(obj);
    return true;
  }
  return false;
};
goog.structs.Pool.prototype.removeFreeObject_ = function() {
  var obj;
  for (; this.getFreeCount() > 0;) {
    obj = this.freeQueue_.dequeue();
    if (!this.objectCanBeReused(obj)) {
      this.adjustForMinMax();
    } else {
      break;
    }
  }
  if (!obj && this.getCount() < this.maxCount_) {
    obj = this.createObject();
  }
  return obj;
};
goog.structs.Pool.prototype.addFreeObject = function(obj) {
  this.inUseSet_.remove(obj);
  if (this.objectCanBeReused(obj) && this.getCount() < this.maxCount_) {
    this.freeQueue_.enqueue(obj);
  } else {
    this.disposeObject(obj);
  }
};
goog.structs.Pool.prototype.adjustForMinMax = function() {
  var freeQueue = this.freeQueue_;
  for (; this.getCount() < this.minCount_;) {
    freeQueue.enqueue(this.createObject());
  }
  for (; this.getCount() > this.maxCount_ && this.getFreeCount() > 0;) {
    this.disposeObject(freeQueue.dequeue());
  }
};
goog.structs.Pool.prototype.createObject = function() {
  return {};
};
goog.structs.Pool.prototype.disposeObject = function(obj) {
  if (typeof obj.dispose == "function") {
    obj.dispose();
  } else {
    var i;
    for (i in obj) {
      obj[i] = null;
    }
  }
};
goog.structs.Pool.prototype.objectCanBeReused = function(obj) {
  if (typeof obj.canBeReused == "function") {
    return obj.canBeReused();
  }
  return true;
};
goog.structs.Pool.prototype.contains = function(obj) {
  return this.freeQueue_.contains(obj) || this.inUseSet_.contains(obj);
};
goog.structs.Pool.prototype.getCount = function() {
  return this.freeQueue_.getCount() + this.inUseSet_.getCount();
};
goog.structs.Pool.prototype.getInUseCount = function() {
  return this.inUseSet_.getCount();
};
goog.structs.Pool.prototype.getFreeCount = function() {
  return this.freeQueue_.getCount();
};
goog.structs.Pool.prototype.isEmpty = function() {
  return this.freeQueue_.isEmpty() && this.inUseSet_.isEmpty();
};
goog.structs.Pool.prototype.disposeInternal = function() {
  goog.structs.Pool.superClass_.disposeInternal.call(this);
  if (this.getInUseCount() > 0) {
    throw new Error(goog.structs.Pool.ERROR_DISPOSE_UNRELEASED_OBJS_);
  }
  delete this.inUseSet_;
  var freeQueue = this.freeQueue_;
  for (; !freeQueue.isEmpty();) {
    this.disposeObject(freeQueue.dequeue());
  }
  delete this.freeQueue_;
};

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