spring-batch LogOrRethrowExceptionHandler 源码

spring-batch LogOrRethrowExceptionHandler 代码

文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/repeat/exception/LogOrRethrowExceptionHandler.java

/*
 * Copyright 2006-2007 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.batch.repeat.exception;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.classify.Classifier;
import org.springframework.classify.ClassifierSupport;
import org.springframework.batch.repeat.RepeatContext;
import org.springframework.batch.repeat.RepeatException;

/**
 * Implementation of {@link ExceptionHandler} based on an {@link Classifier}. The
 * classifier determines whether to log the exception or rethrow it. The keys in the
 * classifier must be the same as the static enum in this class.
 *
 * @author Dave Syer
 *
 */
public class LogOrRethrowExceptionHandler implements ExceptionHandler {

	/**
	 * Logging levels for the handler.
	 *
	 * @author Dave Syer
	 *
	 */
	public static enum Level {

		/**
		 * Key for {@link Classifier} signalling that the throwable should be rethrown. If
		 * the throwable is not a RuntimeException it is wrapped in a
		 * {@link RepeatException}.
		 */
		RETHROW,

		/**
		 * Key for {@link Classifier} signalling that the throwable should be logged at
		 * debug level.
		 */
		DEBUG,

		/**
		 * Key for {@link Classifier} signalling that the throwable should be logged at
		 * warn level.
		 */
		WARN,

		/**
		 * Key for {@link Classifier} signalling that the throwable should be logged at
		 * error level.
		 */
		ERROR

	}

	protected final Log logger = LogFactory.getLog(LogOrRethrowExceptionHandler.class);

	private Classifier<Throwable, Level> exceptionClassifier = new ClassifierSupport<>(Level.RETHROW);

	/**
	 * Setter for the {@link Classifier} used by this handler. The default is to map all
	 * throwable instances to {@link Level#RETHROW}.
	 * @param exceptionClassifier the ExceptionClassifier to use
	 */
	public void setExceptionClassifier(Classifier<Throwable, Level> exceptionClassifier) {
		this.exceptionClassifier = exceptionClassifier;
	}

	/**
	 * Classify the throwables and decide whether to rethrow based on the result. The
	 * context is not used.
	 * @throws Throwable thrown if
	 * {@link LogOrRethrowExceptionHandler#exceptionClassifier} is classified as
	 * {@link Level#RETHROW}.
	 *
	 * @see ExceptionHandler#handleException(RepeatContext, Throwable)
	 */
	@Override
	public void handleException(RepeatContext context, Throwable throwable) throws Throwable {

		Level key = exceptionClassifier.classify(throwable);
		if (Level.ERROR.equals(key)) {
			logger.error("Exception encountered in batch repeat.", throwable);
		}
		else if (Level.WARN.equals(key)) {
			logger.warn("Exception encountered in batch repeat.", throwable);
		}
		else if (Level.DEBUG.equals(key) && logger.isDebugEnabled()) {
			logger.debug("Exception encountered in batch repeat.", throwable);
		}
		else if (Level.RETHROW.equals(key)) {
			throw throwable;
		}

	}

}

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