cacheRunner.LoggingCacheLoader Maven / Gradle / Ivy
/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* 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. See accompanying
* LICENSE file.
*/
package cacheRunner;
import com.gemstone.gemfire.cache.*;
/**
* A CacheLoader that logs information about the events
* it receives.
*
* @see LoggingCacheWriter
*
* @author GemStone Systems, Inc.
* @since 4.0
*/
public class LoggingCacheLoader extends LoggingCacheCallback
implements CacheLoader {
/**
* Before creating a new value for the requested key, this loader
* will do a {@link LoaderHelper#netSearch} to look for the value in
* another member of the distributed system.
*/
public final Object load(LoaderHelper helper)
throws CacheLoaderException {
StringBuffer sb = new StringBuffer();
sb.append("Loader invoked for key: ");
sb.append(format(helper.getKey()));
sb.append("\n");
if (helper.getArgument() != null) {
sb.append(" With argument: ");
sb.append(format(helper.getArgument()));
sb.append("\n");
}
Object value;
try {
value = helper.netSearch(false /* netLoad */);
} catch (TimeoutException ex) {
String s = "Timed out while performing net search";
throw new CacheLoaderException(s, ex);
}
if (value != null) {
sb.append(" Net search found value: ");
sb.append(format(value));
sb.append("\n");
} else {
sb.append(" Net search did not find a value");
value = "Loader Invoked by Thread ID " + Thread.currentThread();
}
log(sb.toString(), helper.getRegion());
return value;
}
}