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org.fabric3.implementation.timer.introspection.TimerImplementationLoader Maven / Gradle / Ivy
/*
* Fabric3
* Copyright (c) 2009-2015 Metaform Systems
*
* Licensed 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.
* Portions originally based on Apache Tuscany 2007
* licensed under the Apache 2.0 license.
*/
package org.fabric3.implementation.timer.introspection;
import javax.xml.stream.Location;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.lang.reflect.Method;
import java.util.concurrent.TimeUnit;
import org.fabric3.implementation.java.introspection.ImplementationArtifactNotFound;
import org.fabric3.implementation.java.introspection.JavaImplementationIntrospector;
import org.fabric3.api.implementation.timer.model.TimerImplementation;
import org.fabric3.api.implementation.timer.model.TimerData;
import org.fabric3.api.implementation.timer.model.TimerType;
import org.fabric3.spi.introspection.IntrospectionContext;
import org.fabric3.spi.introspection.xml.AbstractValidatingTypeLoader;
import org.fabric3.spi.introspection.xml.InvalidValue;
import org.fabric3.spi.introspection.xml.LoaderHelper;
import org.fabric3.spi.introspection.xml.LoaderUtil;
import org.fabric3.spi.introspection.xml.MissingAttribute;
import org.fabric3.api.model.type.java.InjectingComponentType;
import org.oasisopen.sca.annotation.Reference;
import static org.fabric3.api.implementation.timer.model.TimerData.UNSPECIFIED;
/**
* Loads entries in a composite.
*/
public class TimerImplementationLoader extends AbstractValidatingTypeLoader {
private final JavaImplementationIntrospector introspector;
private final LoaderHelper loaderHelper;
public TimerImplementationLoader(@Reference JavaImplementationIntrospector introspector, @Reference LoaderHelper loaderHelper) {
this.introspector = introspector;
this.loaderHelper = loaderHelper;
addAttributes("class", "intervalClass", "fixedRate", "repeatInterval", "fireOnce", "initialDelay", "unit", "requires", "policySets", "poolName");
}
public TimerImplementation load(XMLStreamReader reader, IntrospectionContext context) throws XMLStreamException {
Location startLocation = reader.getLocation();
TimerImplementation implementation = new TimerImplementation();
validateAttributes(reader, context, implementation);
if (!processImplementationClass(implementation, reader, context)) {
// an error with the implementation class, return a dummy implementation
InjectingComponentType type = new InjectingComponentType(null);
implementation.setComponentType(type);
return implementation;
}
TimerData data = new TimerData();
implementation.setTimerData(data);
String poolName = reader.getAttributeValue(null, "poolName");
if (poolName != null) {
data.setPoolName(poolName);
}
processInitialDelay(data, reader, startLocation, context);
processTimeUnit(data, reader, startLocation, context);
processIntervalClass(reader, context, implementation);
processRepeatInterval(reader, startLocation, context, implementation);
processRepeatFixedRate(reader, startLocation, context, implementation);
processFireOnce(reader, startLocation, context, implementation);
processIntervalMethod(context, implementation);
validateData(startLocation, context, data);
loaderHelper.loadPolicySetsAndIntents(implementation, reader, context);
String implClass = implementation.getImplementationClass();
InjectingComponentType componentType = new InjectingComponentType(implClass);
introspector.introspect(componentType, context);
implementation.setComponentType(componentType);
LoaderUtil.skipToEndElement(reader);
return implementation;
}
private void processInitialDelay(TimerData data, XMLStreamReader reader, Location startLocation, IntrospectionContext context) {
String initialDelay = reader.getAttributeValue(null, "initialDelay");
if (initialDelay != null) {
try {
data.setInitialDelay(Long.parseLong(initialDelay));
} catch (NumberFormatException e) {
InvalidValue failure = new InvalidValue("Invalid initial delay", startLocation, e);
context.addError(failure);
}
}
}
private void processTimeUnit(TimerData data, XMLStreamReader reader, Location startLocation, IntrospectionContext context) {
String units = reader.getAttributeValue(null, "unit");
if (units != null) {
try {
TimeUnit timeUnit = TimeUnit.valueOf(units.toUpperCase());
data.setTimeUnit(timeUnit);
} catch (IllegalArgumentException e) {
InvalidValue failure = new InvalidValue("Invalid time unit: " + units, startLocation);
context.addError(failure);
}
}
}
private void validateData(Location startLocation, IntrospectionContext context, TimerData data) {
if (!data.isIntervalMethod() && data.getIntervalClass() == null && data.getFixedRate() == UNSPECIFIED && data.getRepeatInterval() == UNSPECIFIED
&& data.getFireOnce() == UNSPECIFIED) {
MissingAttribute failure = new MissingAttribute("A task, fixed rate, repeat interval, or time must be specified on the timer component",
startLocation);
context.addError(failure);
}
}
private boolean processImplementationClass(TimerImplementation implementation, XMLStreamReader reader, IntrospectionContext context)
throws XMLStreamException {
Location startLocation = reader.getLocation();
String implClass = reader.getAttributeValue(null, "class");
if (implClass == null) {
MissingAttribute failure = new MissingAttribute("The class attribute was not specified", startLocation);
context.addError(failure);
LoaderUtil.skipToEndElement(reader);
return false;
}
implementation.setImplementationClass(implClass);
try {
Class clazz = context.getClassLoader().loadClass(implClass);
if (!(Runnable.class.isAssignableFrom(clazz))) {
InvalidTimerInterface failure = new InvalidTimerInterface(clazz, implementation);
context.addError(failure);
LoaderUtil.skipToEndElement(reader);
return false;
}
} catch (ClassNotFoundException e) {
ImplementationArtifactNotFound failure = new ImplementationArtifactNotFound(implClass, e.getMessage(), implementation);
context.addError(failure);
LoaderUtil.skipToEndElement(reader);
return false;
}
return true;
}
private void processIntervalClass(XMLStreamReader reader, IntrospectionContext context, TimerImplementation implementation) throws XMLStreamException {
TimerData data = implementation.getTimerData();
String intervalClass = reader.getAttributeValue(null, "intervalClass");
if (intervalClass == null) {
// no task defined
return;
}
try {
data.setType(TimerType.RECURRING);
Class clazz = context.getClassLoader().loadClass(intervalClass);
try {
clazz.getMethod("nextInterval");
} catch (NoSuchMethodException e) {
InvalidIntervalClass failure = new InvalidIntervalClass(clazz, implementation);
context.addError(failure);
}
} catch (ClassNotFoundException e) {
ImplementationArtifactNotFound failure = new ImplementationArtifactNotFound(intervalClass, e.getMessage(), implementation);
context.addError(failure);
}
data.setIntervalClass(intervalClass);
}
private void processIntervalMethod(IntrospectionContext context, TimerImplementation implementation) throws XMLStreamException {
try {
String name = implementation.getImplementationClass();
Class clazz = context.getClassLoader().loadClass(name);
Method intervalMethod = clazz.getMethod("nextInterval");
Class type = intervalMethod.getReturnType();
TimerData data = implementation.getTimerData();
data.setIntervalMethod(true); // set regardless of whether the method is valid
data.setType(TimerType.RECURRING);
if (!Long.class.equals(type) && !Long.TYPE.equals(type)) {
InvalidIntervalMethod failure = new InvalidIntervalMethod("The nextInterval method must return a long value: " + name, clazz, implementation);
context.addError(failure);
}
} catch (ClassNotFoundException | NoSuchMethodException e) {
// this should not happen as the impl class should already be loaded
}
}
private void processRepeatInterval(XMLStreamReader reader,
Location startLocation,
IntrospectionContext introspectionContext,
TimerImplementation implementation) {
TimerData data = implementation.getTimerData();
String repeatInterval = reader.getAttributeValue(null, "repeatInterval");
if (repeatInterval != null) {
if (data.getIntervalClass() != null) {
InvalidTimerExpression failure = new InvalidTimerExpression("A task and repeat interval are both specified", startLocation, implementation);
introspectionContext.addError(failure);
}
try {
long repeat = Long.parseLong(repeatInterval);
data.setType(TimerType.INTERVAL);
data.setRepeatInterval(repeat);
} catch (NumberFormatException e) {
InvalidTimerExpression failure = new InvalidTimerExpression("Repeat interval is invalid: " + repeatInterval, startLocation, e, implementation);
introspectionContext.addError(failure);
}
}
}
private void processRepeatFixedRate(XMLStreamReader reader,
Location startLocation,
IntrospectionContext introspectionContext,
TimerImplementation implementation) {
TimerData data = implementation.getTimerData();
String fixedRate = reader.getAttributeValue(null, "fixedRate");
if (fixedRate != null) {
if (data.getIntervalClass() != null) {
InvalidTimerExpression failure = new InvalidTimerExpression("A task and fixed rate are both specified", startLocation, implementation);
introspectionContext.addError(failure);
}
if (data.getRepeatInterval() != UNSPECIFIED) {
InvalidTimerExpression failure = new InvalidTimerExpression("Repeat interval and fixed rate are both specified", startLocation, implementation);
introspectionContext.addError(failure);
}
try {
long rate = Long.parseLong(fixedRate);
data.setType(TimerType.FIXED_RATE);
data.setFixedRate(rate);
} catch (NumberFormatException e) {
InvalidTimerExpression failure = new InvalidTimerExpression("Fixed rate interval is invalid: " + fixedRate, startLocation, e, implementation);
introspectionContext.addError(failure);
}
}
}
private void processFireOnce(XMLStreamReader reader,
Location startLocation,
IntrospectionContext introspectionContext,
TimerImplementation implementation) {
TimerData data = implementation.getTimerData();
String time = reader.getAttributeValue(null, "fireOnce");
if (time != null) {
if (data.getIntervalClass() != null) {
InvalidTimerExpression failure = new InvalidTimerExpression("A task and fire once are both specified", startLocation, implementation);
introspectionContext.addError(failure);
}
if (data.getRepeatInterval() != UNSPECIFIED) {
InvalidTimerExpression failure = new InvalidTimerExpression("Repeat interval and fire once are both specified", startLocation, implementation);
introspectionContext.addError(failure);
}
if (data.getFixedRate() != UNSPECIFIED) {
InvalidTimerExpression failure = new InvalidTimerExpression("Fixed rate and fire once are both specified", startLocation, implementation);
introspectionContext.addError(failure);
}
try {
long rate = Long.parseLong(time);
data.setType(TimerType.ONCE);
data.setFireOnce(rate);
} catch (NumberFormatException e) {
InvalidTimerExpression failure = new InvalidTimerExpression("Fire once time is invalid: " + time, startLocation, e, implementation);
introspectionContext.addError(failure);
}
}
}
}
