| /** |
| * 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.metrics.spi; |
| |
| import java.io.IOException; |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Proxy; |
| import java.util.ArrayList; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.metrics.ContextFactory; |
| import org.apache.hadoop.metrics.MetricsContext; |
| import org.apache.hadoop.metrics.MetricsRecord; |
| import org.apache.hadoop.metrics.MetricsUtil; |
| import org.apache.hadoop.metrics.Updater; |
| |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public class CompositeContext extends AbstractMetricsContext { |
| |
| private static final Log LOG = LogFactory.getLog(CompositeContext.class); |
| private static final String ARITY_LABEL = "arity"; |
| private static final String SUB_FMT = "%s.sub%d"; |
| private final ArrayList<MetricsContext> subctxt = |
| new ArrayList<MetricsContext>(); |
| |
| @InterfaceAudience.Private |
| public CompositeContext() { |
| } |
| |
| @InterfaceAudience.Private |
| public void init(String contextName, ContextFactory factory) { |
| super.init(contextName, factory); |
| int nKids; |
| try { |
| String sKids = getAttribute(ARITY_LABEL); |
| nKids = Integer.valueOf(sKids); |
| } catch (Exception e) { |
| LOG.error("Unable to initialize composite metric " + contextName + |
| ": could not init arity", e); |
| return; |
| } |
| for (int i = 0; i < nKids; ++i) { |
| MetricsContext ctxt = MetricsUtil.getContext( |
| String.format(SUB_FMT, contextName, i), contextName); |
| if (null != ctxt) { |
| subctxt.add(ctxt); |
| } |
| } |
| } |
| |
| @InterfaceAudience.Private |
| @Override |
| public MetricsRecord newRecord(String recordName) { |
| return (MetricsRecord) Proxy.newProxyInstance( |
| MetricsRecord.class.getClassLoader(), |
| new Class[] { MetricsRecord.class }, |
| new MetricsRecordDelegator(recordName, subctxt)); |
| } |
| |
| @InterfaceAudience.Private |
| @Override |
| protected void emitRecord(String contextName, String recordName, |
| OutputRecord outRec) throws IOException { |
| for (MetricsContext ctxt : subctxt) { |
| try { |
| ((AbstractMetricsContext)ctxt).emitRecord( |
| contextName, recordName, outRec); |
| if (contextName == null || recordName == null || outRec == null) { |
| throw new IOException(contextName + ":" + recordName + ":" + outRec); |
| } |
| } catch (IOException e) { |
| LOG.warn("emitRecord failed: " + ctxt.getContextName(), e); |
| } |
| } |
| } |
| |
| @InterfaceAudience.Private |
| @Override |
| protected void flush() throws IOException { |
| for (MetricsContext ctxt : subctxt) { |
| try { |
| ((AbstractMetricsContext)ctxt).flush(); |
| } catch (IOException e) { |
| LOG.warn("flush failed: " + ctxt.getContextName(), e); |
| } |
| } |
| } |
| |
| @InterfaceAudience.Private |
| @Override |
| public void startMonitoring() throws IOException { |
| for (MetricsContext ctxt : subctxt) { |
| try { |
| ctxt.startMonitoring(); |
| } catch (IOException e) { |
| LOG.warn("startMonitoring failed: " + ctxt.getContextName(), e); |
| } |
| } |
| } |
| |
| @InterfaceAudience.Private |
| @Override |
| public void stopMonitoring() { |
| for (MetricsContext ctxt : subctxt) { |
| ctxt.stopMonitoring(); |
| } |
| } |
| |
| /** |
| * Return true if all subcontexts are monitoring. |
| */ |
| @InterfaceAudience.Private |
| @Override |
| public boolean isMonitoring() { |
| boolean ret = true; |
| for (MetricsContext ctxt : subctxt) { |
| ret &= ctxt.isMonitoring(); |
| } |
| return ret; |
| } |
| |
| @InterfaceAudience.Private |
| @Override |
| public void close() { |
| for (MetricsContext ctxt : subctxt) { |
| ctxt.close(); |
| } |
| } |
| |
| @InterfaceAudience.Private |
| @Override |
| public void registerUpdater(Updater updater) { |
| for (MetricsContext ctxt : subctxt) { |
| ctxt.registerUpdater(updater); |
| } |
| } |
| |
| @InterfaceAudience.Private |
| @Override |
| public void unregisterUpdater(Updater updater) { |
| for (MetricsContext ctxt : subctxt) { |
| ctxt.unregisterUpdater(updater); |
| } |
| } |
| |
| private static class MetricsRecordDelegator implements InvocationHandler { |
| private static final Method m_getRecordName = initMethod(); |
| private static Method initMethod() { |
| try { |
| return MetricsRecord.class.getMethod("getRecordName", new Class[0]); |
| } catch (Exception e) { |
| throw new RuntimeException("Internal error", e); |
| } |
| } |
| |
| private final String recordName; |
| private final ArrayList<MetricsRecord> subrecs; |
| |
| MetricsRecordDelegator(String recordName, ArrayList<MetricsContext> ctxts) { |
| this.recordName = recordName; |
| this.subrecs = new ArrayList<MetricsRecord>(ctxts.size()); |
| for (MetricsContext ctxt : ctxts) { |
| subrecs.add(ctxt.createRecord(recordName)); |
| } |
| } |
| |
| public Object invoke(Object p, Method m, Object[] args) throws Throwable { |
| if (m_getRecordName.equals(m)) { |
| return recordName; |
| } |
| assert Void.TYPE.equals(m.getReturnType()); |
| for (MetricsRecord rec : subrecs) { |
| m.invoke(rec, args); |
| } |
| return null; |
| } |
| } |
| |
| } |