org.springframework.data.gemfire.function.PojoFunctionWrapper.java Source code

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Here is the source code for org.springframework.data.gemfire.function.PojoFunctionWrapper.java

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/*
 * Copyright 2002-2013 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
 * 
 * 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.
 */
package org.springframework.data.gemfire.function;

import java.lang.reflect.Method;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.ObjectUtils;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.StringUtils;

import com.gemstone.gemfire.cache.execute.Function;
import com.gemstone.gemfire.cache.execute.FunctionContext;
import com.gemstone.gemfire.cache.execute.ResultSender;

/**
 * Invokes a POJO's given method as a Gemfire remote function. 
 * If the POJO has a constructor that takes a Map, and the function context is Region, the 
 * region will be injected. The delegate class name, the method name, and the method arguments
 * are part of a remote function invocation, therefore all arguments must be serializable 
 * or an alternate serialization method must be used. 
 * The delegate class must be the class path of the remote cache(s)
 * @author David Turanski
 *
 */

@SuppressWarnings("serial")
public class PojoFunctionWrapper implements Function {

    private static transient Log logger = LogFactory.getLog(PojoFunctionWrapper.class);

    private volatile boolean HA;
    private volatile boolean hasResult;
    private volatile boolean optimizeForWrite;

    private volatile int batchSize;

    private final FunctionArgumentResolver functionArgumentResolver;

    private final Method method;

    private final Object target;

    private final String id;

    public PojoFunctionWrapper(Object target, Method method, String id) {
        this.functionArgumentResolver = new FunctionContextInjectingArgumentResolver(method);
        this.target = target;
        this.method = method;
        this.id = (StringUtils.hasText(id) ? id : method.getName());
        this.HA = false;
        this.hasResult = !(method.getReturnType().equals(void.class));
        this.optimizeForWrite = false;
    }

    public void setBatchSize(int batchSize) {
        this.batchSize = batchSize;
    }

    public void setHA(boolean HA) {
        this.HA = HA;
    }

    @Override
    public boolean isHA() {
        return this.HA;
    }

    public void setHasResult(boolean hasResult) {
        this.hasResult = hasResult;
    }

    @Override
    public boolean hasResult() {
        return this.hasResult;
    }

    @Override
    public String getId() {
        return this.id;
    }

    public void setOptimizeForWrite(boolean optimizeForWrite) {
        this.optimizeForWrite = optimizeForWrite;
    }

    @Override
    public boolean optimizeForWrite() {
        return this.optimizeForWrite;
    }

    @Override
    public void execute(final FunctionContext functionContext) {
        Object[] args = this.functionArgumentResolver.resolveFunctionArguments(functionContext);

        Object result = invokeTargetMethod(args);

        if (hasResult()) {
            sendResults(functionContext.getResultSender(), result);
        }
    }

    protected final Object invokeTargetMethod(Object[] args) {
        if (logger.isDebugEnabled()) {
            logger.debug(String.format("about to invoke method %s on class %s as function %s", method.getName(),
                    target.getClass().getName(), this.id));

            for (Object arg : args) {
                logger.debug("arg:" + arg.getClass().getName() + " " + arg.toString());
            }
        }

        return ReflectionUtils.invokeMethod(method, target, (Object[]) args);
    }

    private void sendResults(ResultSender<Object> resultSender, Object result) {
        if (result == null) {
            resultSender.lastResult(null);
        } else {
            if (ObjectUtils.isArray(result)) {
                new BatchingResultSender(batchSize, resultSender).sendArrayResults(result);
            } else if (Iterable.class.isAssignableFrom(result.getClass())) {
                new BatchingResultSender(batchSize, resultSender).sendResults((Iterable<?>) result);
            } else {
                resultSender.lastResult(result);
            }
        }
    }

}