de.hoegertn.demo.cxfsimple.SpringStarter.java Source code

Introduction

Here is the source code for de.hoegertn.demo.cxfsimple.SpringStarter.java

Source

package de.hoegertn.demo.cxfsimple;

/*
 * #%L Daemon with Spring and CXF %% Copyright (C) 2013 Taimos GmbH %% 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. #L%
 */

import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.support.AbstractXmlApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;

public abstract class SpringStarter {

    private final ReadWriteLock rwLock = new ReentrantReadWriteLock();

    private final AtomicReference<AbstractXmlApplicationContext> context = new AtomicReference<>(null);

    protected final Logger logger = LoggerFactory.getLogger(this.getClass());

    public final void doStart() throws Exception {
        try {
            this.doBeforeSpringStart();
        } catch (Exception e) {
            throw new RuntimeException("Before spring failed", e);
        }

        Lock writeLock = this.rwLock.writeLock();
        AbstractXmlApplicationContext ctx = null;
        try {
            writeLock.lock();
            if (this.context.get() != null) {
                throw new RuntimeException("Already started");
            }
            ctx = this.createSpringContext();

            final PropertySourcesPlaceholderConfigurer configurer = new PropertySourcesPlaceholderConfigurer();
            configurer.setProperties(System.getProperties());
            ctx.addBeanFactoryPostProcessor(configurer);

            ctx.setConfigLocation(this.getSpringResource());
            ctx.refresh();
        } catch (Exception e) {
            if (ctx != null) {
                try {
                    ctx.close();
                } catch (Exception e1) {
                    this.logger.warn("Failed to close context", e1);
                }
                ctx = null;
            }
            throw new RuntimeException("Spring context failed", e);
        } finally {
            if (ctx != null) {
                this.context.set(ctx);
            }
            writeLock.unlock();
        }

        try {
            this.doAfterSpringStart();
        } catch (Exception e) {
            throw new RuntimeException("After spring failed", e);
        }
    }

    protected void doAfterSpringStart() {
        //
    }

    protected void doBeforeSpringStart() {
        //
    }

    protected void doAfterSpringStop() {
        //
    }

    protected void doBeforeSpringStop() {
        //
    }

    /**
     * @return the created Spring context
     */
    protected AbstractXmlApplicationContext createSpringContext() {
        return new ClassPathXmlApplicationContext();
    }

    /**
     * @return the name of the Spring resource
     */
    protected String getSpringResource() {
        return "spring/beans.xml";
    }

    public final void doStop() throws Exception {
        try {
            this.doBeforeSpringStop();
        } catch (Exception e) {
            throw new RuntimeException("Before spring stop failed", e);
        }
        Lock writeLock = this.rwLock.writeLock();
        try {
            writeLock.lock();
            if (this.context.get() == null) {
                throw new RuntimeException("Not yet started");
            }
            this.context.get().stop();
            this.context.get().close();
            this.context.set(null);
        } catch (Exception e) {
            throw new RuntimeException("spring stop failed", e);
        } finally {
            writeLock.unlock();
        }

        try {
            this.doAfterSpringStop();
        } catch (Exception e) {
            throw new RuntimeException("After spring stop failed", e);
        }
    }

}