/**
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.hadoop.hbase.client;
import java.lang.reflect.Constructor;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
/**
* Factory implementation to provide the {@link HConnectionImplementation} with
* the implementation of the {@link RetryingCallerInterceptor} that we would use
* to intercept the {@link RpcRetryingCaller} during the course of their calls.
*
*/
@InterfaceAudience.Private
class RetryingCallerInterceptorFactory {
private static final Log LOG = LogFactory
.getLog(RetryingCallerInterceptorFactory.class);
private Configuration conf;
private final boolean failFast;
public static final RetryingCallerInterceptor NO_OP_INTERCEPTOR =
new NoOpRetryableCallerInterceptor(null);
public RetryingCallerInterceptorFactory(Configuration conf) {
this.conf = conf;
failFast = conf.getBoolean(HConstants.HBASE_CLIENT_FAST_FAIL_MODE_ENABLED,
HConstants.HBASE_CLIENT_ENABLE_FAST_FAIL_MODE_DEFAULT);
}
/**
* This builds the implementation of {@link RetryingCallerInterceptor} that we
* specify in the conf and returns the same.
*
* To use {@link PreemptiveFastFailInterceptor}, set HBASE_CLIENT_ENABLE_FAST_FAIL_MODE to true.
* HBASE_CLIENT_FAST_FAIL_INTERCEPTOR_IMPL is defaulted to {@link PreemptiveFastFailInterceptor}
*
* @return The factory build method which creates the
* {@link RetryingCallerInterceptor} object according to the
* configuration.
*/
public RetryingCallerInterceptor build() {
RetryingCallerInterceptor ret = NO_OP_INTERCEPTOR;
if (failFast) {
try {
Class<?> c = conf.getClass(
HConstants.HBASE_CLIENT_FAST_FAIL_INTERCEPTOR_IMPL,
PreemptiveFastFailInterceptor.class);
Constructor<?> constructor = c
.getDeclaredConstructor(Configuration.class);
constructor.setAccessible(true);
ret = (RetryingCallerInterceptor) constructor.newInstance(conf);
} catch (Exception e) {
ret = new PreemptiveFastFailInterceptor(conf);
}
}
LOG.trace("Using " + ret.toString() + " for intercepting the RpcRetryingCaller");
return ret;
}
}