/*
* Copyright 2013-2014 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.redis.core.script;
import java.io.IOException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.core.io.Resource;
import org.springframework.scripting.ScriptSource;
import org.springframework.scripting.support.ResourceScriptSource;
import org.springframework.scripting.support.StaticScriptSource;
import org.springframework.util.Assert;
/**
* Default implementation of {@link RedisScript}. Delegates to an underlying {@link ScriptSource} to retrieve script
* text and detect if script has been modified (and thus should have SHA1 re-calculated). This class is best used as a
* Singleton to avoid re-calculation of SHA1 on every script execution.
*
* @author Jennifer Hickey
* @author Christoph Strobl
* @param <T> The script result type. Should be one of Long, Boolean, List, or deserialized value type. Can be null if
* the script returns a throw-away status (i.e "OK")
*/
public class DefaultRedisScript<T> implements RedisScript<T>, InitializingBean {
private ScriptSource scriptSource;
private String sha1;
private Class<T> resultType;
private final Object shaModifiedMonitor = new Object();
/**
* Creates a new {@link DefaultRedisScript}
*/
public DefaultRedisScript() {}
/**
* Creates a new {@link DefaultRedisScript}
*
* @param script
* @param resultType
*/
public DefaultRedisScript(String script, Class<T> resultType) {
this.setScriptText(script);
this.resultType = resultType;
}
public void afterPropertiesSet() throws Exception {
Assert.notNull(this.scriptSource, "Either script, script location," + " or script source is required");
}
public String getSha1() {
synchronized (shaModifiedMonitor) {
if (sha1 == null || scriptSource.isModified()) {
this.sha1 = DigestUtils.sha1DigestAsHex(getScriptAsString());
}
return sha1;
}
}
public Class<T> getResultType() {
return this.resultType;
}
public String getScriptAsString() {
try {
return scriptSource.getScriptAsString();
} catch (IOException e) {
throw new ScriptingException("Error reading script text", e);
}
}
/**
* @param resultType The script result type. Should be one of Long, Boolean, List, or deserialized value type. Can be
* null if the script returns a throw-away status (i.e "OK")
*/
public void setResultType(Class<T> resultType) {
this.resultType = resultType;
}
/**
* @param script The script text
*/
public void setScriptText(String scriptText) {
this.scriptSource = new StaticScriptSource(scriptText);
}
/**
* @param scriptLocation The location of the script
*/
public void setLocation(Resource scriptLocation) {
this.scriptSource = new ResourceScriptSource(scriptLocation);
}
/**
* @param scriptSource A @{link {@link ScriptSource} pointing to the script
*/
public void setScriptSource(ScriptSource scriptSource) {
this.scriptSource = scriptSource;
}
}