org.openmdx.base.dataprovider.layer.spi.AbstractLayer Maven / Gradle / Ivy
/*
* ====================================================================
* Project: openMDX, http://www.openmdx.org/
* Description: Model Aware REST Port
* Owner: OMEX AG, Switzerland, http://www.omex.ch
* ====================================================================
*
* This software is published under the BSD license as listed below.
*
* Copyright (c) 2017, OMEX AG, Switzerland
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the openMDX team nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* ------------------
*
* This product includes software developed by other organizations as
* listed in the NOTICE file.
*/
package org.openmdx.base.dataprovider.layer.spi;
import javax.resource.ResourceException;
import javax.resource.cci.Interaction;
import org.openmdx.base.exception.RuntimeServiceException;
import org.openmdx.base.exception.ServiceException;
import org.openmdx.base.mof.cci.ModelElement_1_0;
import org.openmdx.base.mof.cci.Model_1_0;
import org.openmdx.base.mof.spi.Model_1Factory;
import org.openmdx.base.resource.cci.RestFunction;
import org.openmdx.base.resource.spi.ResourceExceptions;
import org.openmdx.base.resource.spi.RestInteractionSpec;
import org.openmdx.base.rest.cci.ConsumerRecord;
import org.openmdx.base.rest.cci.ObjectRecord;
import org.openmdx.base.rest.cci.QueryRecord;
import org.openmdx.base.rest.cci.RestConnection;
import org.openmdx.base.rest.cci.ResultRecord;
import org.openmdx.base.rest.spi.AbstractRestInteraction;
import org.openmdx.base.rest.spi.AbstractRestPort;
import org.openmdx.base.rest.spi.DelegatingConsumerRecord;
/**
* Intercepts incoming or outgoing objects
*/
public abstract class AbstractLayer extends AbstractRestPort {
/**
* Constructor
*/
protected AbstractLayer(
boolean incomingInterceptionEnabled,
boolean outgoingInterceptionEnabled
) {
this.incomingInterceptionEnabled = incomingInterceptionEnabled;
this.outgoingInterceptionEnabled = outgoingInterceptionEnabled;
}
/**
* The MOF repository
*/
protected final Model_1_0 model = Model_1Factory.getModel();
/**
* Tells whether incoming objects shall be intercepted
*/
protected final boolean incomingInterceptionEnabled;
/**
* Tells whether outgoing objects shall be intercepted
*/
protected final boolean outgoingInterceptionEnabled;
/**
* Retrieve an object's dereferenced type
*
* @param object the object to be inspected
*
* @return the object's dereferenced type
*
* @throws ServiceException
*/
protected ModelElement_1_0 getObjectClass(ObjectRecord object) throws ServiceException{
return model.getDereferencedType(object.getValue().getRecordName());
}
/**
* Determines whether an object is instance of the given type
*
* @param object to be tested
* @param type the type's refMofId, e.g. 'org:openmdx:base:BasicObject'
*
* @return true if the object is an instance o f the given type
*
* @throws ResourceException
*/
protected boolean isInstanceOf(ObjectRecord object, String type) throws ResourceException{
try {
return model.objectIsSubtypeOf(object, type);
} catch (ServiceException exception) {
throw ResourceExceptions.toResourceException(exception);
}
}
/**
* This method must be overridden to intercept incoming objects and this super method must not be invoked!
*
* This method is dedicated to
* - create
*
- update
*
* @param object
*/
protected abstract void interceptIncomingObject(RestFunction method, ObjectRecord object) throws ResourceException;
/**
* This method is overridden to intercept outgoing objects upon success, i.e. when
* the delegate layer returns true.
*
* This method is dedicated to
* - get
*
- find
*
- consume
*
- create
*
- update
*
* @param object
*
* @throws ResourceException
*/
protected abstract void interceptOutgoingObject(RestFunction method, ObjectRecord object) throws ResourceException;
protected boolean isIncomingInterceptionEnabled(RestInteractionSpec ispec) {
return incomingInterceptionEnabled && isIncomingTrafficEnabled(ispec);
}
protected boolean isOutgoingInterceptionEnabled(RestInteractionSpec ispec) {
return outgoingInterceptionEnabled && isOutgoingTrafficEnabled(ispec);
}
/* (non-Javadoc)
* @see org.openmdx.base.resource.spi.Port#getInteraction(javax.resource.cci.Connection)
*/
@Override
public Interaction getInteraction(
RestConnection connection
) throws ResourceException {
return new InterceptingInteraction(connection, newDelegateInteraction(connection));
}
/**
* Intercepting Interaction
*/
protected class InterceptingInteraction extends AbstractRestInteraction {
/**
* Constructor
*/
protected InterceptingInteraction(
RestConnection connection,
Interaction delegate
) throws ResourceException {
super(connection, delegate);
}
/* (non-Javadoc)
* @see org.openmdx.base.rest.spi.AbstractRestInteraction#consume(org.openmdx.base.resource.spi.RestInteractionSpec, org.openmdx.base.rest.cci.QueryRecord, org.openmdx.base.rest.cci.ConsumerRecord)
*/
@Override
protected boolean consume(
final RestInteractionSpec ispec,
final QueryRecord input,
final ConsumerRecord output
) throws ResourceException {
return super.consume(
ispec,
input,
isOutgoingInterceptionEnabled(ispec) ? newInterceptingConsumer(ispec, output) : output
);
}
@SuppressWarnings("serial")
private DelegatingConsumerRecord newInterceptingConsumer(
final RestInteractionSpec ispec,
final ConsumerRecord output
) {
return new DelegatingConsumerRecord() {
@Override
public void accept(ObjectRecord object) {
try {
interceptOutgoingObject(ispec.getFunction(), object);
} catch (ResourceException exception) {
throw new RuntimeServiceException(exception);
}
super.accept(object);
}
@Override
protected ConsumerRecord getDelegate() {
return output;
}
};
}
/* (non-Javadoc)
* @see org.openmdx.base.rest.spi.AbstractRestInteraction#find(org.openmdx.base.resource.spi.RestInteractionSpec, org.openmdx.base.rest.cci.QueryRecord, org.openmdx.base.rest.cci.ResultRecord)
*/
@Override
protected boolean find(
RestInteractionSpec ispec,
QueryRecord input,
ResultRecord output
) throws ResourceException {
final boolean found = super.find(ispec, input, output);
if(found && isOutgoingInterceptionEnabled(ispec)){
interceptOutgoingObjects(ispec.getFunction(), output);
}
return found;
}
/* (non-Javadoc)
* @see org.openmdx.base.rest.spi.AbstractRestInteraction#get(org.openmdx.base.resource.spi.RestInteractionSpec, org.openmdx.base.rest.cci.QueryRecord, org.openmdx.base.rest.cci.ResultRecord)
*/
@Override
protected boolean get(
RestInteractionSpec ispec,
QueryRecord input,
ResultRecord output
) throws ResourceException {
final boolean got = super.find(ispec, input, output);
if(got && isOutgoingInterceptionEnabled(ispec)){
interceptOutgoingObjects(ispec.getFunction(), output);
}
return got;
}
/* (non-Javadoc)
* @see org.openmdx.base.rest.spi.AbstractRestInteraction#update(org.openmdx.base.resource.spi.RestInteractionSpec, org.openmdx.base.rest.cci.ObjectRecord, org.openmdx.base.rest.cci.ResultRecord)
*/
@Override
protected boolean update(
RestInteractionSpec ispec,
ObjectRecord input,
ResultRecord output
) throws ResourceException {
if(isIncomingInterceptionEnabled(ispec)) {
interceptIncomingObject(ispec.getFunction(), input);
}
final boolean updated = super.update(ispec, input, output);
if(updated && isOutgoingInterceptionEnabled(ispec)){
interceptOutgoingObjects(ispec.getFunction(), output);
}
return updated;
}
/* (non-Javadoc)
* @see org.openmdx.base.rest.spi.AbstractRestInteraction#create(org.openmdx.base.resource.spi.RestInteractionSpec, org.openmdx.base.rest.cci.ObjectRecord, org.openmdx.base.rest.cci.ResultRecord)
*/
@Override
protected boolean create(
RestInteractionSpec ispec,
ObjectRecord input,
ResultRecord output
) throws ResourceException {
if(isIncomingInterceptionEnabled(ispec)) {
interceptIncomingObject(ispec.getFunction(), input);
}
final boolean created = super.create(ispec, input, output);
if(created && isOutgoingInterceptionEnabled(ispec)){
interceptOutgoingObjects(ispec.getFunction(), output);
}
return created;
}
final private void interceptOutgoingObjects(
RestFunction method,
ResultRecord result
) throws ResourceException{
for(Object object : result) {
interceptOutgoingObject(method, (ObjectRecord) object);
}
}
}
}
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