activemq-cpp/src/main/activemq/transport/inactivity/ReadChecker.cpp

/*
 * 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.
 */

#include "ReadChecker.h"

#include <activemq/transport/inactivity/InactivityMonitor.h>

#include <decaf/lang/System.h>
#include <decaf/lang/exceptions/NullPointerException.h>

using namespace activemq;
using namespace activemq::transport;
using namespace activemq::transport::inactivity;
using namespace decaf;
using namespace decaf::util;
using namespace decaf::lang;
using namespace decaf::lang::exceptions;

////////////////////////////////////////////////////////////////////////////////
ReadChecker::ReadChecker(InactivityMonitor* parent) : TimerTask(), parent(parent), lastRunTime(0) {

    if (this->parent == NULL) {
        throw NullPointerException(__FILE__, __LINE__, "ReadChecker created with NULL parent.");
    }
}

////////////////////////////////////////////////////////////////////////////////
ReadChecker::~ReadChecker() {
}

////////////////////////////////////////////////////////////////////////////////
void ReadChecker::run() {

    long long now = System::currentTimeMillis();
    long long elapsed = (now - this->lastRunTime);

    // Perhaps the timer executed a read check late.. and then executes
    // the next read check on time which causes the time elapsed between
    // read checks to be small..

    // If less than 90% of the read check Time elapsed then abort this readcheck.
    if (!this->parent->allowReadCheck(elapsed)) {
        return;
    }

    this->lastRunTime = now;

    // Invoke the parent check routine.
    this->parent->readCheck();
}