/*
* 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.
*/
using System;
using System.Collections.Generic;
using System.Runtime.Remoting.Lifetime;
using System.Text;
namespace Lucene.Net.Distributed.Search
{
///
/// An derived implementation of RemoteSearchable, DistributedSearchable provides additional
/// support for integration with .Net remoting objects and constructs.
///
[Serializable]
public class DistributedSearchable : Lucene.Net.Search.RemoteSearchable
{
private static readonly int TIME_FACTOR = 30;
private static int initialLeaseTime = SupportClass.AppSettings.Get("LeaseTime", -1);
private static TimeSpan leaseTimeSpan;
///
/// Standard constructor for DistributedSearchable
///
/// Any derived Searchable object
public DistributedSearchable(Lucene.Net.Search.Searchable local)
: base(local)
{
}
// Override on lifetime service; returning NULL yields an unlimited TTL
///
/// Override of the base LifetimeService policy for this object. This method
/// manages the lifetime of objects marshaled and released in remoting environments
/// and distributed garbage collection.
///
/// Object of type ILease
public override object InitializeLifetimeService()
{
DistributedSearchable.leaseTimeSpan = new TimeSpan(0, 0, DistributedSearchable.initialLeaseTime + DistributedSearchable.TIME_FACTOR);
if (DistributedSearchable.initialLeaseTime == -1)
{
return null; //Permanent TTL; never get's GC'd
}
else
{
ILease oLease = (ILease) base.InitializeLifetimeService();
if (oLease.CurrentState == LeaseState.Initial)
{
oLease.InitialLeaseTime = TimeSpan.FromSeconds(DistributedSearchable.leaseTimeSpan.TotalSeconds);
oLease.RenewOnCallTime = TimeSpan.FromSeconds(DistributedSearchable.TIME_FACTOR);
}
return oLease;
}
}
///
/// Method to extend the lifetime of a DistributedSearchable object.
///
public void Renew()
{
ILease oLease = (ILease)this.GetLifetimeService();
oLease.Renew(DistributedSearchable.GetLeaseTimeSpan());
}
///
/// Retrieves the lifetime lease length composed as a TimeSpan object
///
/// TimeSpan representing the length of the lifetime lease for this object
public static TimeSpan GetLeaseTimeSpan()
{
return DistributedSearchable.leaseTimeSpan;
}
///
/// Returns the configured number of seconds for the lifetime length of this object
///
/// int representing the configured number of seconds for the lifetime length of this object
public static int GetInitialLeaseTime()
{
return DistributedSearchable.initialLeaseTime;
}
}
}