private void ReleaseInstance(PartCompositionId partId)
{
var info = m_Parts[partId];
if (info.Instance != null)
{
DisconnectPartInstanceFromImportingParts(partId);
var updatedInstances = Instances.Release(info.Instance);
foreach (var instance in updatedInstances)
{
if (instance.Change == InstanceChange.Removed)
{
var updatedInfo = m_Parts.FirstOrDefault(p => instance.Instance.Equals(p.Value.Instance));
updatedInfo.Value.Instance = null;
}
}
}
}
private IEnumerable<Tuple<ImportRegistrationId, PartCompositionId, ExportRegistrationId>> SatisfiedPartImports(PartCompositionId partId)
{
return m_PartConnections
.InEdges(partId)
.Select(
edge => new Tuple<ImportRegistrationId, PartCompositionId, ExportRegistrationId>(
edge.ImportRegistration,
edge.Source,
edge.ExportRegistration));
}
private void DisconnectInstanceFromExport(
PartCompositionId importingInstance,
ImportRegistrationId importId,
PartCompositionId exportingInstance)
{
var importingPartInfo = m_Parts[importingInstance];
if (importingPartInfo.Instance != null)
{
var importDefinition = importingPartInfo.Definition.Import(importId);
if (importDefinition.IsPrerequisite)
{
ReleaseInstance(importingInstance);
}
else
{
var satisfiedPartImports = SatisfiedPartImports(importingInstance)
.Where(p => !p.Item2.Equals(exportingInstance));
var partImports = ImportInformationForPart(satisfiedPartImports);
var updatedInstances = Instances.UpdateIfRequired(importingPartInfo.Instance, partImports);
foreach (var instance in updatedInstances)
{
if (instance.Change == InstanceChange.Removed)
{
var updatedInfo = m_Parts.FirstOrDefault(p => instance.Instance.Equals(p.Value.Instance));
updatedInfo.Value.Instance = null;
}
}
}
}
}
private void DisconnectPartInstanceFromImportingParts(PartCompositionId partId)
{
var importingParts = m_PartConnections
.OutEdges(partId)
.Select(edge => new Tuple<PartCompositionId, ImportRegistrationId>(edge.Target, edge.ImportRegistration));
foreach (var pair in importingParts)
{
DisconnectInstanceFromExport(pair.Item1, pair.Item2, partId);
}
}
private void ConstructInstance(PartCompositionId partId)
{
if (CanPartBeInstantiated(partId))
{
var satisfiedPartImports = SatisfiedPartImports(partId);
foreach (var importPair in satisfiedPartImports)
{
var exportingPartInfo = m_Parts[importPair.Item2];
if (exportingPartInfo.Instance == null)
{
ConstructInstance(importPair.Item2);
}
}
var partImports = ImportInformationForPart(satisfiedPartImports);
var info = m_Parts[partId];
if (info.Instance != null)
{
var updatedInstances = Instances.UpdateIfRequired(info.Instance, partImports);
foreach (var instance in updatedInstances)
{
if (instance.Change == InstanceChange.Removed)
{
var updatedInfo = m_Parts.FirstOrDefault(p => instance.Instance.Equals(p.Value.Instance));
updatedInfo.Value.Instance = null;
}
}
}
else
{
info.Instance = Instances.Construct(
info.Definition,
partImports);
}
}
}
private bool CanPartBeInstantiated(PartCompositionId partId)
{
var info = m_Parts[partId];
if (info.Instance != null)
{
return true;
}
var satisfiedPartImports = SatisfiedPartImports(partId);
var satisfiedRequiredPartImports = satisfiedPartImports.Where(p => info.Definition.Import(p.Item1).IsPrerequisite);
return AreRequiredPartImportsSatisfied(partId, satisfiedRequiredPartImports.Select(p => p.Item1))
&& CanPartsBeInstantiated(satisfiedRequiredPartImports.Select(p => p.Item2));
}
private bool AreRequiredPartImportsSatisfied(PartCompositionId partId, IEnumerable<ImportRegistrationId> satisfiedRequiredImports)
{
var info = m_Parts[partId];
var unsatisfiedImports = info.Definition
.RegisteredImports
.Where(id => info.Definition.Import(id).IsPrerequisite)
.Except(satisfiedRequiredImports);
return !unsatisfiedImports.Any();
}
/// <summary>
/// Removes the group that is related to the specified ID.
/// </summary>
/// <param name="group">The ID of the group that should be removed.</param>
public void Remove(GroupCompositionId group)
{
if (group == null)
{
return;
}
if (!m_Groups.ContainsKey(group))
{
return;
}
var definitionId = m_Groups[group];
var definition = m_Definitions[definitionId];
foreach (var part in definition.Parts)
{
var partId = new PartCompositionId(group, part.Id);
Debug.Assert(m_Parts.ContainsKey(partId), "The part collection should have the given part ID.");
Debug.Assert(m_PartConnections.ContainsVertex(partId), "The part connections graph should have the given part ID.");
var info = m_Parts[partId];
if (info.Instance != null)
{
ReleaseInstance(partId);
}
m_PartConnections.RemoveVertex(partId);
m_Parts.Remove(partId);
}
Debug.Assert(m_GroupConnections.ContainsVertex(group), "The connections graph should have the given group ID.");
m_GroupConnections.RemoveVertex(group);
m_Groups.Remove(group);
if (!m_Groups.Any(p => p.Value.Equals(definitionId)))
{
m_Definitions.Remove(definitionId);
}
}
/// <summary>
/// Adds a new <see cref="GroupDefinition"/> to the graph and returns the ID for that group.
/// </summary>
/// <param name="id">The ID of the group that is being added.</param>
/// <param name="group">The group that should be added to the graph.</param>
/// <exception cref="ArgumentNullException">
/// Thrown if <paramref name="id"/> is <see langword="null" />.
/// </exception>
/// <exception cref="ArgumentNullException">
/// Thrown if <paramref name="group"/> is <see langword="null" />.
/// </exception>
public void Add(GroupCompositionId id, GroupDefinition group)
{
{
Lokad.Enforce.Argument(() => id);
Lokad.Enforce.Argument(() => group);
}
if (!m_Definitions.ContainsKey(group.Id))
{
m_Definitions.Add(group.Id, group);
}
m_Groups.Add(id, group.Id);
m_GroupConnections.AddVertex(id);
foreach (var part in group.Parts)
{
var partId = new PartCompositionId(id, part.Id);
m_Parts.Add(partId, new PartCompositionInfo(part));
m_PartConnections.AddVertex(partId);
}
var parts = PartsForGroup(id);
ConnectParts(group.InternalConnections, parts, parts);
}
