org.springframework.web.socket.handler.BeanCreatingHandlerProvider.java Source code

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Here is the source code for org.springframework.web.socket.handler.BeanCreatingHandlerProvider.java

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/*
 * Copyright 2002-2018 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.web.socket.handler;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;

/**
 * Instantiates a target handler through a Spring {@link BeanFactory} and also provides
 * an equivalent destroy method. Mainly for internal use to assist with initializing and
 * destroying handlers with per-connection lifecycle.
 *
 * @author Rossen Stoyanchev
 * @since 4.0
 * @param <T> the handler type
 */
public class BeanCreatingHandlerProvider<T> implements BeanFactoryAware {

    private final Class<? extends T> handlerType;

    @Nullable
    private AutowireCapableBeanFactory beanFactory;

    public BeanCreatingHandlerProvider(Class<? extends T> handlerType) {
        Assert.notNull(handlerType, "handlerType must not be null");
        this.handlerType = handlerType;
    }

    @Override
    public void setBeanFactory(BeanFactory beanFactory) {
        if (beanFactory instanceof AutowireCapableBeanFactory) {
            this.beanFactory = (AutowireCapableBeanFactory) beanFactory;
        }
    }

    public void destroy(T handler) {
        if (this.beanFactory != null) {
            this.beanFactory.destroyBean(handler);
        }
    }

    public Class<? extends T> getHandlerType() {
        return this.handlerType;
    }

    public T getHandler() {
        if (this.beanFactory != null) {
            return this.beanFactory.createBean(this.handlerType);
        } else {
            return BeanUtils.instantiateClass(this.handlerType);
        }
    }

    @Override
    public String toString() {
        return "BeanCreatingHandlerProvider[handlerType=" + this.handlerType + "]";
    }

}