org.springframework.integration.dsl.IntegrationComponentSpec Maven / Gradle / Ivy
/*
* Copyright 2016-2019 the original author or authors.
*
* 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
*
* https://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.
*/
package org.springframework.integration.dsl;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.config.AbstractFactoryBean;
import org.springframework.context.Lifecycle;
import org.springframework.context.SmartLifecycle;
import org.springframework.expression.spel.standard.SpelExpressionParser;
/**
* The common Builder abstraction. The {@link #get()} method returns the final component.
*
* @param the target {@link IntegrationComponentSpec} implementation type.
* @param the target type.
*
* @author Artem Bilan
*
* @since 5.0
*/
public abstract class IntegrationComponentSpec, T>
extends AbstractFactoryBean
implements SmartLifecycle {
protected static final SpelExpressionParser PARSER = new SpelExpressionParser();
protected volatile T target; // NOSONAR
private String id;
/**
* Configure the component identifier. Used as the {@code beanName} to register the
* bean in the application context for this component.
* @param idToSet the id.
* @return the spec.
*/
protected S id(String idToSet) {
this.id = idToSet;
return _this();
}
public final String getId() {
return this.id;
}
/**
* @return the configured component.
*/
public T get() {
if (this.target == null) {
this.target = doGet();
}
return this.target;
}
@Override
public Class getObjectType() {
return get().getClass();
}
@Override
protected T createInstance() {
T instance = get();
if (instance instanceof InitializingBean) {
try {
((InitializingBean) instance).afterPropertiesSet();
}
catch (Exception e) {
throw new IllegalStateException("Cannot initialize bean: " + instance, e);
}
}
return instance;
}
@Override
protected void destroyInstance(T instance) {
if (instance instanceof DisposableBean) {
try {
((DisposableBean) instance).destroy();
}
catch (Exception e) {
throw new IllegalStateException("Cannot destroy bean: " + instance, e);
}
}
}
@Override
public void start() {
T instance = get();
if (instance instanceof Lifecycle) {
((Lifecycle) instance).start();
}
}
@Override
public void stop() {
T instance = get();
if (instance instanceof Lifecycle) {
((Lifecycle) instance).stop();
}
}
@Override
public boolean isRunning() {
T instance = get();
return !(instance instanceof Lifecycle) || ((Lifecycle) instance).isRunning();
}
@Override
public boolean isAutoStartup() {
T instance = get();
return instance instanceof SmartLifecycle && ((SmartLifecycle) instance).isAutoStartup();
}
@Override
public void stop(Runnable callback) {
T instance = get();
if (instance instanceof SmartLifecycle) {
((SmartLifecycle) instance).stop(callback);
}
else {
callback.run();
}
}
@Override
public int getPhase() {
T instance = get();
if (instance instanceof SmartLifecycle) {
return ((SmartLifecycle) instance).getPhase();
}
else {
return 0;
}
}
@SuppressWarnings("unchecked")
protected final S _this() { // NOSONAR
return (S) this;
}
protected T doGet() {
throw new UnsupportedOperationException();
}
}