added GemfireItemWriter

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/KeyValueItemWriter.java

@@ -0,0 +1,84 @@
+/*
+ * 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.batch.item;
+
+import java.util.List;
+
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.util.Assert;
+
+/**
+ * A base class to implement any {@link ItemWriter} that writes to a key value store 
+ * using a {@link Converter} to derive a key from an item
+ * 
+ * @author David Turanski
+ * @since 2.2
+ *
+ */
+public abstract class KeyValueItemWriter<K, V> implements ItemWriter<V>, InitializingBean {
+
+	protected Converter<V, K> itemKeyMapper;
+	protected boolean delete;
+
+	/* (non-Javadoc)
+	 * @see org.springframework.batch.item.ItemWriter#write(java.util.List)
+	 */
+	@Override
+	public void write(List<? extends V> items) throws Exception {
+		if (items == null) {
+			return;
+		}
+		for (V item : items) {
+			K key = itemKeyMapper.convert(item);
+			writeKeyValue(key, item);
+		}
+	}
+
+	/**
+	 * Subclasses implement this method to write each item to key value store
+	 * @param key the key
+	 * @param value the item
+	 */
+	protected abstract void writeKeyValue(K key, V value);
+
+	/**
+	 * afterPropertiesSet() hook
+	 */
+	protected abstract void init();
+
+	/**
+	 * Set the {@link Converter} to use to derive the key from the item
+	 * @param itemKeyMapper
+	 */
+	public void setItemKeyMapper(Converter<V, K> itemKeyMapper) {
+		this.itemKeyMapper = itemKeyMapper;
+	}
+
+	/**
+	 * Sets the delete flag to have the item writer perform deletes
+	 * @param delete
+	 */
+	public void setDelete(boolean delete) {
+		this.delete = delete;
+	}
+
+	/* (non-Javadoc)
+	 * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
+	 */
+	@Override
+	public void afterPropertiesSet() throws Exception {
+		Assert.notNull(itemKeyMapper, "itemKeyMapper requires a Converter type.");
+		init();
+	}
+}

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/SpELItemKeyMapper.java

@@ -0,0 +1,40 @@
+/*
+ * 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.batch.item;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.expression.Expression;
+import org.springframework.expression.ExpressionParser;
+import org.springframework.expression.spel.standard.SpelExpressionParser;
+
+/**
+ * An implementation of {@link Converter} that uses SpEL to map a Value to a key
+ * @author David Turanski
+ * @since 2.2
+ */
+public class SpELItemKeyMapper<K,V> implements Converter<V,K> {
+	private final ExpressionParser parser = new SpelExpressionParser();
+	private final Expression parsedExpression;
+	
+	public SpELItemKeyMapper(String keyExpression) {
+		parsedExpression =  parser.parseExpression(keyExpression);
+	}
+	/* (non-Javadoc)
+	 * @see org.springframework.batch.item.ItemKeyMapper#mapKey(java.lang.Object)
+	 */
+	@SuppressWarnings("unchecked")
+	@Override
+	public K convert(V item) {
+		return (K) parsedExpression.getValue(item);
+	}
+}

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/data/GemfireItemWriter.java

@@ -0,0 +1,55 @@
+/*
+ * 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.batch.item.data;
+
+import org.springframework.batch.item.KeyValueItemWriter;
+import org.springframework.data.gemfire.GemfireTemplate;
+import org.springframework.util.Assert;
+
+/**
+ * An {@ link ItemWriter} that stores items in GemFire
+ * 
+ * @author David Turanski
+ * @since 2.2
+ *
+ */
+public class GemfireItemWriter<K,V> extends KeyValueItemWriter<K,V> {
+	private GemfireTemplate gemfireTemplate;
+	/**
+	 * @param gemfireTemplate the {@link GemfireTemplate} to set
+	 */
+	public void setTemplate(GemfireTemplate gemfireTemplate) {
+		this.gemfireTemplate = gemfireTemplate;
+	}
+
+	/* (non-Javadoc)
+	 * @see org.springframework.batch.item.KeyValueItemWriter#writeKeyValue(java.lang.Object, java.lang.Object)
+	 */
+	@Override
+	protected void writeKeyValue(K key, V value) {
+		if (delete) {
+			gemfireTemplate.remove(key);
+		} else {
+			gemfireTemplate.put(key, value);
+		}
+	}
+
+	/* (non-Javadoc)
+	 * @see org.springframework.batch.item.KeyValueItemWriter#init()
+	 */
+	@Override
+	protected void init() {
+		Assert.notNull(gemfireTemplate, "A GemfireTemplate is required.");
+	}
+
+}

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/data/SpELMappingGemfireItemWriter.java

@@ -0,0 +1,34 @@
+/*
+ * 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.batch.item.data;
+
+import org.springframework.batch.item.SpELItemKeyMapper;
+import org.springframework.util.Assert;
+
+/**
+ * A convenient {@link GemfireItemWriter} implementation that uses a {@ link SpELItemKeyMapper}
+ * 
+ * @author David Turanski
+ * @since 2.2
+ */
+public class SpELMappingGemfireItemWriter<K,V> extends GemfireItemWriter<K, V>{
+	/**
+	 * A constructor that accepts a SpEL expression used to derive the key
+	 * @param keyExpression
+	 */
+	SpELMappingGemfireItemWriter(String keyExpression) {
+		super();
+		Assert.hasText(keyExpression,"a valid keyExpression is required.");
+		setItemKeyMapper(new SpELItemKeyMapper<K, V>(keyExpression));
+	}
+}