[120] | 1 | /** |
---|
| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
---|
| 3 | * or more contributor license agreements. See the NOTICE file |
---|
| 4 | * distributed with this work for additional information |
---|
| 5 | * regarding copyright ownership. The ASF licenses this file |
---|
| 6 | * to you under the Apache License, Version 2.0 (the |
---|
| 7 | * "License"); you may not use this file except in compliance |
---|
| 8 | * with the License. You may obtain a copy of the License at |
---|
| 9 | * |
---|
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
---|
| 11 | * |
---|
| 12 | * Unless required by applicable law or agreed to in writing, software |
---|
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
---|
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
---|
| 15 | * See the License for the specific language governing permissions and |
---|
| 16 | * limitations under the License. |
---|
| 17 | */ |
---|
| 18 | package org.apache.hadoop.metrics.spi; |
---|
| 19 | |
---|
| 20 | import java.io.IOException; |
---|
| 21 | import java.lang.reflect.InvocationHandler; |
---|
| 22 | import java.lang.reflect.Method; |
---|
| 23 | import java.lang.reflect.Proxy; |
---|
| 24 | import java.util.ArrayList; |
---|
| 25 | |
---|
| 26 | import org.apache.commons.logging.Log; |
---|
| 27 | import org.apache.commons.logging.LogFactory; |
---|
| 28 | |
---|
| 29 | import org.apache.hadoop.metrics.ContextFactory; |
---|
| 30 | import org.apache.hadoop.metrics.MetricsContext; |
---|
| 31 | import org.apache.hadoop.metrics.MetricsException; |
---|
| 32 | import org.apache.hadoop.metrics.MetricsRecord; |
---|
| 33 | import org.apache.hadoop.metrics.MetricsUtil; |
---|
| 34 | import org.apache.hadoop.metrics.Updater; |
---|
| 35 | |
---|
| 36 | public class CompositeContext extends AbstractMetricsContext { |
---|
| 37 | |
---|
| 38 | private static final Log LOG = LogFactory.getLog(CompositeContext.class); |
---|
| 39 | private static final String ARITY_LABEL = "arity"; |
---|
| 40 | private static final String SUB_FMT = "%s.sub%d"; |
---|
| 41 | private final ArrayList<MetricsContext> subctxt = |
---|
| 42 | new ArrayList<MetricsContext>(); |
---|
| 43 | |
---|
| 44 | public CompositeContext() { |
---|
| 45 | } |
---|
| 46 | |
---|
| 47 | public void init(String contextName, ContextFactory factory) { |
---|
| 48 | super.init(contextName, factory); |
---|
| 49 | int nKids; |
---|
| 50 | try { |
---|
| 51 | String sKids = getAttribute(ARITY_LABEL); |
---|
| 52 | nKids = Integer.valueOf(sKids); |
---|
| 53 | } catch (Exception e) { |
---|
| 54 | LOG.error("Unable to initialize composite metric " + contextName + |
---|
| 55 | ": could not init arity", e); |
---|
| 56 | return; |
---|
| 57 | } |
---|
| 58 | for (int i = 0; i < nKids; ++i) { |
---|
| 59 | MetricsContext ctxt = MetricsUtil.getContext( |
---|
| 60 | String.format(SUB_FMT, contextName, i), contextName); |
---|
| 61 | if (null != ctxt) { |
---|
| 62 | subctxt.add(ctxt); |
---|
| 63 | } |
---|
| 64 | } |
---|
| 65 | } |
---|
| 66 | |
---|
| 67 | @Override |
---|
| 68 | public MetricsRecord newRecord(String recordName) { |
---|
| 69 | return (MetricsRecord) Proxy.newProxyInstance( |
---|
| 70 | MetricsRecord.class.getClassLoader(), |
---|
| 71 | new Class[] { MetricsRecord.class }, |
---|
| 72 | new MetricsRecordDelegator(recordName, subctxt)); |
---|
| 73 | } |
---|
| 74 | |
---|
| 75 | @Override |
---|
| 76 | protected void emitRecord(String contextName, String recordName, |
---|
| 77 | OutputRecord outRec) throws IOException { |
---|
| 78 | for (MetricsContext ctxt : subctxt) { |
---|
| 79 | try { |
---|
| 80 | ((AbstractMetricsContext)ctxt).emitRecord( |
---|
| 81 | contextName, recordName, outRec); |
---|
| 82 | if (contextName == null || recordName == null || outRec == null) { |
---|
| 83 | throw new IOException(contextName + ":" + recordName + ":" + outRec); |
---|
| 84 | } |
---|
| 85 | } catch (IOException e) { |
---|
| 86 | LOG.warn("emitRecord failed: " + ctxt.getContextName(), e); |
---|
| 87 | } |
---|
| 88 | } |
---|
| 89 | } |
---|
| 90 | |
---|
| 91 | @Override |
---|
| 92 | protected void flush() throws IOException { |
---|
| 93 | for (MetricsContext ctxt : subctxt) { |
---|
| 94 | try { |
---|
| 95 | ((AbstractMetricsContext)ctxt).flush(); |
---|
| 96 | } catch (IOException e) { |
---|
| 97 | LOG.warn("flush failed: " + ctxt.getContextName(), e); |
---|
| 98 | } |
---|
| 99 | } |
---|
| 100 | } |
---|
| 101 | |
---|
| 102 | @Override |
---|
| 103 | public void startMonitoring() throws IOException { |
---|
| 104 | for (MetricsContext ctxt : subctxt) { |
---|
| 105 | try { |
---|
| 106 | ctxt.startMonitoring(); |
---|
| 107 | } catch (IOException e) { |
---|
| 108 | LOG.warn("startMonitoring failed: " + ctxt.getContextName(), e); |
---|
| 109 | } |
---|
| 110 | } |
---|
| 111 | } |
---|
| 112 | |
---|
| 113 | @Override |
---|
| 114 | public void stopMonitoring() { |
---|
| 115 | for (MetricsContext ctxt : subctxt) { |
---|
| 116 | ctxt.stopMonitoring(); |
---|
| 117 | } |
---|
| 118 | } |
---|
| 119 | |
---|
| 120 | /** |
---|
| 121 | * Return true if all subcontexts are monitoring. |
---|
| 122 | */ |
---|
| 123 | @Override |
---|
| 124 | public boolean isMonitoring() { |
---|
| 125 | boolean ret = true; |
---|
| 126 | for (MetricsContext ctxt : subctxt) { |
---|
| 127 | ret &= ctxt.isMonitoring(); |
---|
| 128 | } |
---|
| 129 | return ret; |
---|
| 130 | } |
---|
| 131 | |
---|
| 132 | @Override |
---|
| 133 | public void close() { |
---|
| 134 | for (MetricsContext ctxt : subctxt) { |
---|
| 135 | ctxt.close(); |
---|
| 136 | } |
---|
| 137 | } |
---|
| 138 | |
---|
| 139 | @Override |
---|
| 140 | public void registerUpdater(Updater updater) { |
---|
| 141 | for (MetricsContext ctxt : subctxt) { |
---|
| 142 | ctxt.registerUpdater(updater); |
---|
| 143 | } |
---|
| 144 | } |
---|
| 145 | |
---|
| 146 | @Override |
---|
| 147 | public void unregisterUpdater(Updater updater) { |
---|
| 148 | for (MetricsContext ctxt : subctxt) { |
---|
| 149 | ctxt.unregisterUpdater(updater); |
---|
| 150 | } |
---|
| 151 | } |
---|
| 152 | |
---|
| 153 | private static class MetricsRecordDelegator implements InvocationHandler { |
---|
| 154 | private static final Method m_getRecordName = initMethod(); |
---|
| 155 | private static Method initMethod() { |
---|
| 156 | try { |
---|
| 157 | return MetricsRecord.class.getMethod("getRecordName", new Class[0]); |
---|
| 158 | } catch (Exception e) { |
---|
| 159 | throw new RuntimeException("Internal error", e); |
---|
| 160 | } |
---|
| 161 | } |
---|
| 162 | |
---|
| 163 | private final String recordName; |
---|
| 164 | private final ArrayList<MetricsRecord> subrecs; |
---|
| 165 | |
---|
| 166 | MetricsRecordDelegator(String recordName, ArrayList<MetricsContext> ctxts) { |
---|
| 167 | this.recordName = recordName; |
---|
| 168 | this.subrecs = new ArrayList<MetricsRecord>(ctxts.size()); |
---|
| 169 | for (MetricsContext ctxt : ctxts) { |
---|
| 170 | subrecs.add(ctxt.createRecord(recordName)); |
---|
| 171 | } |
---|
| 172 | } |
---|
| 173 | |
---|
| 174 | public Object invoke(Object p, Method m, Object[] args) throws Throwable { |
---|
| 175 | if (m_getRecordName.equals(m)) { |
---|
| 176 | return recordName; |
---|
| 177 | } |
---|
| 178 | assert Void.TYPE.equals(m.getReturnType()); |
---|
| 179 | for (MetricsRecord rec : subrecs) { |
---|
| 180 | m.invoke(rec, args); |
---|
| 181 | } |
---|
| 182 | return null; |
---|
| 183 | } |
---|
| 184 | } |
---|
| 185 | |
---|
| 186 | } |
---|