com.googlecode.jsonrpc4j.spring.JsonProxyFactoryBean.java Source code

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Here is the source code for com.googlecode.jsonrpc4j.spring.JsonProxyFactoryBean.java

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/*
The MIT License (MIT)
    
Copyright (c) 2014 jsonrpc4j
    
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
    
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
    
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
 */

package com.googlecode.jsonrpc4j.spring;

import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.beans.factory.BeanFactoryUtils;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.remoting.support.UrlBasedRemoteAccessor;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.googlecode.jsonrpc4j.JsonRpcHttpClient;
import com.googlecode.jsonrpc4j.JsonRpcClient.RequestListener;
import com.googlecode.jsonrpc4j.ReflectionUtil;

/**
 * {@link FactoryBean} for creating a {@link UrlBasedRemoteAccessor}
 * (aka consumer) for accessing an HTTP based JSON-RPC service.
 *
 */
public class JsonProxyFactoryBean extends UrlBasedRemoteAccessor
        implements MethodInterceptor, InitializingBean, FactoryBean<Object>, ApplicationContextAware {

    private boolean useNamedParams = false;
    private Object proxyObject = null;
    private RequestListener requestListener = null;
    private ObjectMapper objectMapper = null;
    private JsonRpcHttpClient jsonRpcHttpClient = null;
    private Map<String, String> extraHttpHeaders = new HashMap<String, String>();
    private ApplicationContext applicationContext;

    /**
     * {@inheritDoc}
     */
    @Override
    @SuppressWarnings("unchecked")
    public void afterPropertiesSet() {
        super.afterPropertiesSet();

        // create proxy
        proxyObject = ProxyFactory.getProxy(getServiceInterface(), this);

        // find the ObjectMapper
        if (objectMapper == null && applicationContext != null && applicationContext.containsBean("objectMapper")) {
            objectMapper = (ObjectMapper) applicationContext.getBean("objectMapper");
        }
        if (objectMapper == null && applicationContext != null) {
            try {
                objectMapper = (ObjectMapper) BeanFactoryUtils.beanOfTypeIncludingAncestors(applicationContext,
                        ObjectMapper.class);
            } catch (Exception e) {
                /* no-op */ }
        }
        if (objectMapper == null) {
            objectMapper = new ObjectMapper();
        }

        // create JsonRpcHttpClient
        try {
            jsonRpcHttpClient = new JsonRpcHttpClient(objectMapper, new URL(getServiceUrl()), extraHttpHeaders);
            jsonRpcHttpClient.setRequestListener(requestListener);
        } catch (MalformedURLException mue) {
            throw new RuntimeException(mue);
        }
    }

    /**
     * {@inheritDoc}
     */
    public Object invoke(MethodInvocation invocation) throws Throwable {

        // handle toString()
        Method method = invocation.getMethod();
        if (method.getDeclaringClass() == Object.class && method.getName().equals("toString")) {
            return proxyObject.getClass().getName() + "@" + System.identityHashCode(proxyObject);
        }

        // get return type
        Type retType = (invocation.getMethod().getGenericReturnType() != null)
                ? invocation.getMethod().getGenericReturnType()
                : invocation.getMethod().getReturnType();

        // get arguments
        Object arguments = ReflectionUtil.parseArguments(invocation.getMethod(), invocation.getArguments(),
                useNamedParams);

        // invoke it
        return jsonRpcHttpClient.invoke(invocation.getMethod().getName(), arguments, retType, extraHttpHeaders);
    }

    /**
     * {@inheritDoc}
     */
    public Object getObject() throws Exception {
        return proxyObject;
    }

    /**
     * {@inheritDoc}
     */
    public Class<?> getObjectType() {
        return getServiceInterface();
    }

    /**
     * {@inheritDoc}
     */
    public boolean isSingleton() {
        return true;
    }

    /**
     * {@inheritDoc}
     */
    public void setApplicationContext(ApplicationContext applicationContext) {
        this.applicationContext = applicationContext;
    }

    /**
     * @param objectMapper the objectMapper to set
     */
    public void setObjectMapper(ObjectMapper objectMapper) {
        this.objectMapper = objectMapper;
    }

    /**
     * @param extraHttpHeaders the extraHttpHeaders to set
     */
    public void setExtraHttpHeaders(Map<String, String> extraHttpHeaders) {
        this.extraHttpHeaders = extraHttpHeaders;
    }

    /**
     * @param requestListener the requestListener to set
     */
    public void setRequestListener(RequestListener requestListener) {
        this.requestListener = requestListener;
    }

    /**
     * @param useNamedParams the useNamedParams to set
     */
    public void setUseNamedParams(boolean useNamedParams) {
        this.useNamedParams = useNamedParams;
    }

}