Brian O'Connor | f3d0616 | 2014-10-02 15:54:12 -0700 | [diff] [blame] | 1 | package org.onlab.onos.net.intent; |
| 2 | |
| 3 | import java.util.ArrayList; |
| 4 | import java.util.Collections; |
| 5 | import java.util.HashMap; |
| 6 | import java.util.HashSet; |
| 7 | import java.util.List; |
| 8 | import java.util.Map; |
| 9 | import java.util.Set; |
| 10 | import java.util.concurrent.ExecutorService; |
| 11 | import java.util.concurrent.Executors; |
| 12 | |
| 13 | /** |
| 14 | * Fake implementation of the intent service to assist in developing tests |
| 15 | * of the interface contract. |
| 16 | */ |
| 17 | public class FakeIntentManager implements TestableIntentService { |
| 18 | |
| 19 | private final Map<IntentId, Intent> intents = new HashMap<>(); |
| 20 | private final Map<IntentId, IntentState> intentStates = new HashMap<>(); |
| 21 | private final Map<IntentId, List<InstallableIntent>> installables = new HashMap<>(); |
| 22 | private final Set<IntentEventListener> listeners = new HashSet<>(); |
| 23 | |
| 24 | private final Map<Class<? extends Intent>, IntentCompiler<? extends Intent>> compilers = new HashMap<>(); |
| 25 | private final Map<Class<? extends InstallableIntent>, |
| 26 | IntentInstaller<? extends InstallableIntent>> installers = new HashMap<>(); |
| 27 | |
| 28 | private final ExecutorService executor = Executors.newSingleThreadExecutor(); |
| 29 | private final List<IntentException> exceptions = new ArrayList<>(); |
| 30 | |
| 31 | @Override |
| 32 | public List<IntentException> getExceptions() { |
| 33 | return exceptions; |
| 34 | } |
| 35 | |
| 36 | // Provides an out-of-thread simulation of intent submit life-cycle |
| 37 | private void executeSubmit(final Intent intent) { |
| 38 | registerSubclassCompilerIfNeeded(intent); |
| 39 | executor.execute(new Runnable() { |
| 40 | @Override |
| 41 | public void run() { |
| 42 | try { |
| 43 | List<InstallableIntent> installable = compileIntent(intent); |
| 44 | installIntents(intent, installable); |
| 45 | } catch (IntentException e) { |
| 46 | exceptions.add(e); |
| 47 | } |
| 48 | } |
| 49 | }); |
| 50 | } |
| 51 | |
| 52 | // Provides an out-of-thread simulation of intent withdraw life-cycle |
| 53 | private void executeWithdraw(final Intent intent) { |
| 54 | executor.execute(new Runnable() { |
| 55 | @Override |
| 56 | public void run() { |
| 57 | try { |
| 58 | List<InstallableIntent> installable = getInstallable(intent.getId()); |
| 59 | uninstallIntents(intent, installable); |
| 60 | } catch (IntentException e) { |
| 61 | exceptions.add(e); |
| 62 | } |
| 63 | |
| 64 | } |
| 65 | }); |
| 66 | } |
| 67 | |
| 68 | private <T extends Intent> IntentCompiler<T> getCompiler(T intent) { |
| 69 | @SuppressWarnings("unchecked") |
| 70 | IntentCompiler<T> compiler = (IntentCompiler<T>) compilers.get(intent.getClass()); |
| 71 | if (compiler == null) { |
| 72 | throw new IntentException("no compiler for class " + intent.getClass()); |
| 73 | } |
| 74 | return compiler; |
| 75 | } |
| 76 | |
| 77 | private <T extends InstallableIntent> IntentInstaller<T> getInstaller(T intent) { |
| 78 | @SuppressWarnings("unchecked") |
| 79 | IntentInstaller<T> installer = (IntentInstaller<T>) installers.get(intent.getClass()); |
| 80 | if (installer == null) { |
| 81 | throw new IntentException("no installer for class " + intent.getClass()); |
| 82 | } |
| 83 | return installer; |
| 84 | } |
| 85 | |
| 86 | private <T extends Intent> List<InstallableIntent> compileIntent(T intent) { |
| 87 | try { |
| 88 | // For the fake, we compile using a single level pass |
| 89 | List<InstallableIntent> installable = new ArrayList<>(); |
| 90 | for (Intent compiled : getCompiler(intent).compile(intent)) { |
| 91 | installable.add((InstallableIntent) compiled); |
| 92 | } |
| 93 | setState(intent, IntentState.COMPILED); |
| 94 | return installable; |
| 95 | } catch (IntentException e) { |
| 96 | setState(intent, IntentState.FAILED); |
| 97 | throw e; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | private void installIntents(Intent intent, List<InstallableIntent> installable) { |
| 102 | try { |
| 103 | for (InstallableIntent ii : installable) { |
| 104 | registerSubclassInstallerIfNeeded(ii); |
| 105 | getInstaller(ii).install(ii); |
| 106 | } |
| 107 | setState(intent, IntentState.INSTALLED); |
| 108 | putInstallable(intent.getId(), installable); |
| 109 | } catch (IntentException e) { |
| 110 | setState(intent, IntentState.FAILED); |
| 111 | throw e; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | private void uninstallIntents(Intent intent, List<InstallableIntent> installable) { |
| 116 | try { |
| 117 | for (InstallableIntent ii : installable) { |
| 118 | getInstaller(ii).uninstall(ii); |
| 119 | } |
| 120 | setState(intent, IntentState.WITHDRAWN); |
| 121 | removeInstallable(intent.getId()); |
| 122 | } catch (IntentException e) { |
| 123 | setState(intent, IntentState.FAILED); |
| 124 | throw e; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | |
| 129 | // Sets the internal state for the given intent and dispatches an event |
| 130 | private void setState(Intent intent, IntentState state) { |
| 131 | IntentState previous = intentStates.get(intent.getId()); |
| 132 | intentStates.put(intent.getId(), state); |
| 133 | dispatch(new IntentEvent(intent, state, previous, System.currentTimeMillis())); |
| 134 | } |
| 135 | |
| 136 | private void putInstallable(IntentId id, List<InstallableIntent> installable) { |
| 137 | installables.put(id, installable); |
| 138 | } |
| 139 | |
| 140 | private void removeInstallable(IntentId id) { |
| 141 | installables.remove(id); |
| 142 | } |
| 143 | |
| 144 | private List<InstallableIntent> getInstallable(IntentId id) { |
| 145 | List<InstallableIntent> installable = installables.get(id); |
| 146 | if (installable != null) { |
| 147 | return installable; |
| 148 | } else { |
| 149 | return Collections.emptyList(); |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | @Override |
| 154 | public void submit(Intent intent) { |
| 155 | intents.put(intent.getId(), intent); |
| 156 | setState(intent, IntentState.SUBMITTED); |
| 157 | executeSubmit(intent); |
| 158 | } |
| 159 | |
| 160 | @Override |
| 161 | public void withdraw(Intent intent) { |
| 162 | intents.remove(intent.getId()); |
| 163 | setState(intent, IntentState.WITHDRAWING); |
| 164 | executeWithdraw(intent); |
| 165 | } |
| 166 | |
| 167 | @Override |
| 168 | public void execute(IntentOperations operations) { |
| 169 | // TODO: implement later |
| 170 | } |
| 171 | |
| 172 | @Override |
| 173 | public Set<Intent> getIntents() { |
| 174 | return Collections.unmodifiableSet(new HashSet<>(intents.values())); |
| 175 | } |
| 176 | |
| 177 | @Override |
| 178 | public Intent getIntent(IntentId id) { |
| 179 | return intents.get(id); |
| 180 | } |
| 181 | |
| 182 | @Override |
| 183 | public IntentState getIntentState(IntentId id) { |
| 184 | return intentStates.get(id); |
| 185 | } |
| 186 | |
| 187 | @Override |
| 188 | public void addListener(IntentEventListener listener) { |
| 189 | listeners.add(listener); |
| 190 | } |
| 191 | |
| 192 | @Override |
| 193 | public void removeListener(IntentEventListener listener) { |
| 194 | listeners.remove(listener); |
| 195 | } |
| 196 | |
| 197 | private void dispatch(IntentEvent event) { |
| 198 | for (IntentEventListener listener : listeners) { |
| 199 | listener.event(event); |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | @Override |
| 204 | public <T extends Intent> void registerCompiler(Class<T> cls, IntentCompiler<T> compiler) { |
| 205 | compilers.put(cls, compiler); |
| 206 | } |
| 207 | |
| 208 | @Override |
| 209 | public <T extends Intent> void unregisterCompiler(Class<T> cls) { |
| 210 | compilers.remove(cls); |
| 211 | } |
| 212 | |
| 213 | @Override |
| 214 | public Map<Class<? extends Intent>, IntentCompiler<? extends Intent>> getCompilers() { |
| 215 | return Collections.unmodifiableMap(compilers); |
| 216 | } |
| 217 | |
| 218 | @Override |
| 219 | public <T extends InstallableIntent> void registerInstaller(Class<T> cls, IntentInstaller<T> installer) { |
| 220 | installers.put(cls, installer); |
| 221 | } |
| 222 | |
| 223 | @Override |
| 224 | public <T extends InstallableIntent> void unregisterInstaller(Class<T> cls) { |
| 225 | installers.remove(cls); |
| 226 | } |
| 227 | |
| 228 | @Override |
| 229 | public Map<Class<? extends InstallableIntent>, |
| 230 | IntentInstaller<? extends InstallableIntent>> getInstallers() { |
| 231 | return Collections.unmodifiableMap(installers); |
| 232 | } |
| 233 | |
| 234 | private void registerSubclassCompilerIfNeeded(Intent intent) { |
| 235 | if (!compilers.containsKey(intent.getClass())) { |
| 236 | Class<?> cls = intent.getClass(); |
| 237 | while (cls != Object.class) { |
| 238 | // As long as we're within the Intent class descendants |
| 239 | if (Intent.class.isAssignableFrom(cls)) { |
| 240 | IntentCompiler<?> compiler = compilers.get(cls); |
| 241 | if (compiler != null) { |
| 242 | compilers.put(intent.getClass(), compiler); |
| 243 | return; |
| 244 | } |
| 245 | } |
| 246 | cls = cls.getSuperclass(); |
| 247 | } |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | private void registerSubclassInstallerIfNeeded(InstallableIntent intent) { |
| 252 | if (!installers.containsKey(intent.getClass())) { |
| 253 | Class<?> cls = intent.getClass(); |
| 254 | while (cls != Object.class) { |
| 255 | // As long as we're within the InstallableIntent class descendants |
| 256 | if (InstallableIntent.class.isAssignableFrom(cls)) { |
| 257 | IntentInstaller<?> installer = installers.get(cls); |
| 258 | if (installer != null) { |
| 259 | installers.put(intent.getClass(), installer); |
| 260 | return; |
| 261 | } |
| 262 | } |
| 263 | cls = cls.getSuperclass(); |
| 264 | } |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | } |