| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.fs; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.util.Shell; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationTargetException; |
| |
| public interface GetSpaceUsed { |
| |
| |
| long getUsed() throws IOException; |
| |
| /** |
| * The builder class |
| */ |
| class Builder { |
| static final Logger LOG = LoggerFactory.getLogger(Builder.class); |
| |
| private Configuration conf; |
| private Class<? extends GetSpaceUsed> klass = null; |
| private File path = null; |
| private Long interval = null; |
| private Long jitter = null; |
| private Long initialUsed = null; |
| private Constructor<? extends GetSpaceUsed> cons; |
| |
| public Configuration getConf() { |
| return conf; |
| } |
| |
| public Builder setConf(Configuration conf) { |
| this.conf = conf; |
| return this; |
| } |
| |
| public long getInterval() { |
| if (interval != null) { |
| return interval; |
| } |
| long result = CommonConfigurationKeys.FS_DU_INTERVAL_DEFAULT; |
| if (conf == null) { |
| return result; |
| } |
| return conf.getLong(CommonConfigurationKeys.FS_DU_INTERVAL_KEY, result); |
| } |
| |
| public Builder setInterval(long interval) { |
| this.interval = interval; |
| return this; |
| } |
| |
| public Class<? extends GetSpaceUsed> getKlass() { |
| if (klass != null) { |
| return klass; |
| } |
| Class<? extends GetSpaceUsed> result = null; |
| if (Shell.WINDOWS) { |
| result = WindowsGetSpaceUsed.class; |
| } else { |
| result = DU.class; |
| } |
| if (conf == null) { |
| return result; |
| } |
| return conf.getClass(CommonConfigurationKeys.FS_GETSPACEUSED_CLASSNAME, |
| result, GetSpaceUsed.class); |
| } |
| |
| public Builder setKlass(Class<? extends GetSpaceUsed> klass) { |
| this.klass = klass; |
| return this; |
| } |
| |
| public File getPath() { |
| return path; |
| } |
| |
| public Builder setPath(File path) { |
| this.path = path; |
| return this; |
| } |
| |
| public long getInitialUsed() { |
| if (initialUsed == null) { |
| return -1; |
| } |
| return initialUsed; |
| } |
| |
| public Builder setInitialUsed(long initialUsed) { |
| this.initialUsed = initialUsed; |
| return this; |
| } |
| |
| |
| public long getJitter() { |
| if (jitter == null) { |
| Configuration configuration = this.conf; |
| |
| if (configuration == null) { |
| return CommonConfigurationKeys.FS_GETSPACEUSED_JITTER_DEFAULT; |
| } |
| return configuration.getLong(CommonConfigurationKeys.FS_GETSPACEUSED_JITTER_KEY, |
| CommonConfigurationKeys.FS_GETSPACEUSED_JITTER_DEFAULT); |
| } |
| return jitter; |
| } |
| |
| public Builder setJitter(Long jit) { |
| this.jitter = jit; |
| return this; |
| } |
| |
| public Constructor<? extends GetSpaceUsed> getCons() { |
| return cons; |
| } |
| |
| public void setCons(Constructor<? extends GetSpaceUsed> cons) { |
| this.cons = cons; |
| } |
| |
| public GetSpaceUsed build() throws IOException { |
| GetSpaceUsed getSpaceUsed = null; |
| try { |
| if (cons == null) { |
| cons = getKlass().getConstructor(Builder.class); |
| } |
| |
| getSpaceUsed = cons.newInstance(this); |
| } catch (InstantiationException e) { |
| LOG.warn("Error trying to create an instance of " + getKlass(), e); |
| } catch (IllegalAccessException e) { |
| LOG.warn("Error trying to create " + getKlass(), e); |
| } catch (InvocationTargetException e) { |
| LOG.warn("Error trying to create " + getKlass(), e); |
| } catch (NoSuchMethodException e) { |
| LOG.warn("Doesn't look like the class " + getKlass() + |
| " have the needed constructor", e); |
| } |
| // If there were any exceptions then du will be null. |
| // Construct our best guess fallback. |
| if (getSpaceUsed == null) { |
| if (Shell.WINDOWS) { |
| getSpaceUsed = new WindowsGetSpaceUsed(this); |
| } else { |
| getSpaceUsed = new DU(this); |
| } |
| } |
| // Call init after classes constructors have finished. |
| if (getSpaceUsed instanceof CachingGetSpaceUsed) { |
| ((CachingGetSpaceUsed) getSpaceUsed).init(); |
| } |
| return getSpaceUsed; |
| } |
| |
| } |
| } |