org.fabric3.fabric.binding.BindingSelectorImpl Maven / Gradle / Ivy
/*
* Fabric3
* Copyright (c) 2009-2013 Metaform Systems
*
* Fabric3 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version, with the
* following exception:
*
* Linking this software statically or dynamically with other
* modules is making a combined work based on this software.
* Thus, the terms and conditions of the GNU General Public
* License cover the whole combination.
*
* As a special exception, the copyright holders of this software
* give you permission to link this software with independent
* modules to produce an executable, regardless of the license
* terms of these independent modules, and to copy and distribute
* the resulting executable under terms of your choice, provided
* that you also meet, for each linked independent module, the
* terms and conditions of the license of that module. An
* independent module is a module which is not derived from or
* based on this software. If you modify this software, you may
* extend this exception to your version of the software, but
* you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version.
*
* Fabric3 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the
* GNU General Public License along with Fabric3.
* If not, see providers = new ArrayList();
public BindingSelectorImpl(@Reference HostInfo info) {
this.info = info;
}
@Property(required = false)
public void setDisable(boolean disable) {
this.disable = disable;
}
/**
* Lazily injects providers as they become available from runtime extensions.
*
* @param providers the set of providers
*/
@Reference(required = false)
public void setProviders(List providers) {
this.providers = providers;
orderProviders();
}
@Reference(required = false)
public void setStrategy(BindingSelectionStrategy strategy) {
this.strategy = strategy;
}
@Init
public void orderProviders() {
if (strategy != null) {
strategy.order(providers);
}
}
public void selectBindings(LogicalCompositeComponent domain) throws BindingSelectionException {
if (RuntimeMode.CONTROLLER != info.getRuntimeMode() || disable) {
// there are no remote wires when the domain is contained withing a single VM (including Participant mode, which has a runtime domain)
return;
}
Collection> components = domain.getComponents();
for (LogicalComponent component : components) {
if (component.getState() == LogicalState.NEW) {
selectBindings(component);
}
}
for (LogicalChannel channel : domain.getChannels()) {
selectBinding(channel);
}
}
/**
* Selects and configures bindings for wires sourced from the given component.
*
* @param component the component
* @throws BindingSelectionException if an error occurs selecting a binding
*/
private void selectBindings(LogicalComponent component) throws BindingSelectionException {
for (LogicalReference reference : component.getReferences()) {
for (LogicalWire wire : reference.getWires()) {
LogicalService targetService = wire.getTarget();
if (targetService != null) {
LogicalComponent targetComponent = targetService.getParent();
if ((LOCAL_ZONE.equals(component.getZone()) && LOCAL_ZONE.equals(targetComponent.getZone()))) {
// components are local, no need for a binding
continue;
} else if (!LOCAL_ZONE.equals(component.getZone()) && component.getZone().equals(targetComponent.getZone())) {
// components are local, no need for a binding
continue;
}
selectBinding(wire);
}
}
}
}
/**
* Selects and configures a binding for a wire.
*
* @param wire the wire
* @throws BindingSelectionException if an error occurs selecting a binding
*/
private void selectBinding(LogicalWire wire) throws BindingSelectionException {
List results = new ArrayList();
LogicalReference source = wire.getSource();
LogicalService target = wire.getTarget();
for (BindingProvider provider : providers) {
BindingMatchResult result = provider.canBind(wire);
if (result.isMatch()) {
// clear binding.sca
source.getBindings().clear();
target.getBindings().clear();
provider.bind(wire);
if (source.getLeafReference().getBindings().isEmpty()) {
QName type = result.getType();
throw new BindingSelectionException("Binding provider error. Provider did not set a binding for the reference: " + type);
}
if (target.getLeafService().getBindings().isEmpty()) {
QName type = result.getType();
throw new BindingSelectionException("Binding provider error. Provider did not set a binding for the service: " + type);
}
wire.setSourceBinding(source.getBindings().get(0));
if (!target.getBindings().isEmpty()) {
wire.setTargetBinding(target.getBindings().get(0));
} else {
wire.setTargetBinding(target.getLeafService().getBindings().get(0));
}
return;
}
results.add(result);
}
URI sourceUri = source.getUri();
URI targetUri = target.getUri();
throw new NoSCABindingProviderException("No SCA binding provider suitable for creating wire from " + sourceUri + " to " + targetUri, results);
}
/**
* Selects and configures a binding for a channel.
*
* @param channel the channel
* @throws BindingSelectionException if an error occurs selecting a binding
*/
private void selectBinding(LogicalChannel channel) throws BindingSelectionException {
if (channel.isConcreteBound()) {
return;
}
List results = new ArrayList();
for (BindingProvider provider : providers) {
BindingMatchResult result = provider.canBind(channel);
if (result.isMatch()) {
// clear binding.sca
channel.clearBinding();
provider.bind(channel);
if (channel.getBindings().isEmpty()) {
QName type = result.getType();
throw new BindingSelectionException("Binding provider error. Provider did not set a binding for the channel: " + type);
}
return;
}
results.add(result);
}
URI uri = channel.getUri();
throw new NoSCABindingProviderException("No SCA binding provider suitable for channel " + uri, results);
}
}
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