org.springframework.batch.repeat.RepeatContext.java Source code

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Here is the source code for org.springframework.batch.repeat.RepeatContext.java

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/*
 * 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;

import org.springframework.core.AttributeAccessor;

/**
 * Base interface for context which controls the state and completion /
 * termination of a batch step. A new context is created for each call to the
 * {@link RepeatOperations}. Within a batch callback code can communicate via
 * the {@link AttributeAccessor} interface.
 * 
 * @author Dave Syer
 * 
 * @see RepeatOperations#iterate(RepeatCallback)
 * 
 */
public interface RepeatContext extends AttributeAccessor {

    /**
     * If batches are nested, then the inner batch will be created with the
     * outer one as a parent. This is an accessor for the parent if it exists.
     * 
     * @return the parent context or null if there is none
     */
    RepeatContext getParent();

    /**
     * Public access to a counter for the number of operations attempted.
     * 
     * @return the number of batch operations started.
     */
    int getStartedCount();

    /**
     * Signal to the framework that the current batch should complete normally,
     * independent of the current {@link CompletionPolicy}.
     */
    void setCompleteOnly();

    /**
     * Public accessor for the complete flag.
     *
     * @return indicator if the repeat is complete
     */
    boolean isCompleteOnly();

    /**
     * Signal to the framework that the current batch should complete
     * abnormally, independent of the current {@link CompletionPolicy}.
     */
    void setTerminateOnly();

    /**
     * Public accessor for the termination flag. If this flag is set then the
     * complete flag will also be.
     *
     * @return indicates if the repeat should terminate
     */
    boolean isTerminateOnly();

    /**
     * Register a callback to be executed on close, associated with the
     * attribute having the given name. The {@link Runnable} callback should not
     * throw any exceptions.
     * 
     * @param name the name of the attribute to associated this callback with.
     * If this attribute is removed the callback should never be called.
     * @param callback a {@link Runnable} to execute when the context is closed.
     */
    void registerDestructionCallback(String name, Runnable callback);

    /**
     * Allow resources to be cleared, especially in destruction callbacks.
     * Implementations should ensure that any registered destruction callbacks
     * are executed here, as long as the corresponding attribute is still
     * available.
     */
    void close();

}