programming/impl/src/main/java/org/opendaylight/bgpcep/programming/impl/ProgrammingServiceImpl.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.bgpcep.programming.impl;
   9
  10 import com.google.common.base.Preconditions;
  11 import com.google.common.util.concurrent.FutureCallback;
  12 import com.google.common.util.concurrent.Futures;
  13 import com.google.common.util.concurrent.ListenableFuture;
  14 import com.google.common.util.concurrent.ListeningExecutorService;
  15 import com.google.common.util.concurrent.SettableFuture;
  16 import io.netty.util.Timeout;
  17 import io.netty.util.Timer;
  18 import io.netty.util.TimerTask;
  19 import java.math.BigInteger;
  20 import java.util.ArrayList;
  21 import java.util.Collections;
  22 import java.util.HashMap;
  23 import java.util.Iterator;
  24 import java.util.List;
  25 import java.util.Map;
  26 import java.util.concurrent.Callable;
  27 import java.util.concurrent.ExecutionException;
  28 import java.util.concurrent.TimeUnit;
  29 import org.opendaylight.bgpcep.programming.NanotimeUtil;
  30 import org.opendaylight.bgpcep.programming.spi.ExecutionResult;
  31 import org.opendaylight.bgpcep.programming.spi.Instruction;
  32 import org.opendaylight.bgpcep.programming.spi.InstructionScheduler;
  33 import org.opendaylight.bgpcep.programming.spi.SchedulerException;
  34 import org.opendaylight.bgpcep.programming.spi.SuccessfulRpcResult;
  35 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  36 import org.opendaylight.controller.md.sal.binding.api.ReadWriteTransaction;
  37 import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
  38 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  39 import org.opendaylight.controller.sal.binding.api.NotificationProviderService;
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.CancelInstructionInput;
  41 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.CancelInstructionOutput;
  42 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.CancelInstructionOutputBuilder;
  43 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.CleanInstructionsInput;
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.CleanInstructionsOutput;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.CleanInstructionsOutputBuilder;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.DeadOnArrival;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.DuplicateInstructionId;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.InstructionId;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.InstructionStatus;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.InstructionStatusChangedBuilder;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.InstructionsQueue;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.InstructionsQueueBuilder;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.Nanotime;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.ProgrammingService;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.SubmitInstructionInput;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.UnknownInstruction;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.UnknownPreconditionId;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.instruction.queue.InstructionBuilder;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.instruction.queue.InstructionKey;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.instruction.status.changed.Details;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.submit.instruction.output.result.failure._case.FailureBuilder;
  62 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  63 import org.opendaylight.yangtools.yang.common.RpcResult;
  64 import org.slf4j.Logger;
  65 import org.slf4j.LoggerFactory;
  66
  67 public final class ProgrammingServiceImpl implements AutoCloseable, InstructionScheduler, ProgrammingService {
  68     private static final Logger LOG = LoggerFactory.getLogger(ProgrammingServiceImpl.class);
  69
  70     private final Map<InstructionId, InstructionImpl> insns = new HashMap<>();
  71     private final InstanceIdentifier<InstructionsQueue> qid;
  72     private final NotificationProviderService notifs;
  73     private final ListeningExecutorService executor;
  74     private final DataBroker dataProvider;
  75     private final Timer timer;
  76
  77     private final class InstructionPusher implements QueueInstruction {
  78         private final InstructionBuilder builder = new InstructionBuilder();
  79
  80         InstructionPusher(final InstructionId id, final Nanotime deadline) {
  81             builder.setDeadline(deadline);
  82             builder.setId(id);
  83             builder.setKey(new InstructionKey(id));
  84             builder.setStatus(InstructionStatus.Queued);
  85         }
  86
  87         @Override
  88         public void instructionUpdated(final InstructionStatus status, final Details details) {
  89             if (!status.equals(builder.getStatus())) {
  90                 builder.setStatus(status);
  91
  92                 final WriteTransaction t = dataProvider.newWriteOnlyTransaction();
  93                 t.put(LogicalDatastoreType.OPERATIONAL,
  94                         qid.child(
  95                                 org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.instruction.queue.Instruction.class,
  96                                 new InstructionKey(builder.getId())), builder.build());
  97                 t.submit();
  98             }
  99
 100             notifs.publish(new InstructionStatusChangedBuilder().setId(builder.getId()).setStatus(status).setDetails(details).build());
 101         }
 102
 103         @Override
 104         public void instructionRemoved() {
 105             final WriteTransaction t = dataProvider.newWriteOnlyTransaction();
 106             t.delete(LogicalDatastoreType.OPERATIONAL, qid.child(
 107                     org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.instruction.queue.Instruction.class,
 108                     new InstructionKey(builder.getId())));
 109             t.submit();
 110         }
 111     }
 112
 113     public ProgrammingServiceImpl(final DataBroker dataProvider, final NotificationProviderService notifs,
 114             final ListeningExecutorService executor, final Timer timer) {
 115         this.dataProvider = Preconditions.checkNotNull(dataProvider);
 116         this.notifs = Preconditions.checkNotNull(notifs);
 117         this.executor = Preconditions.checkNotNull(executor);
 118         this.timer = Preconditions.checkNotNull(timer);
 119         qid = InstanceIdentifier.builder(InstructionsQueue.class).toInstance();
 120
 121         final ReadWriteTransaction t = dataProvider.newReadWriteTransaction();
 122         try {
 123             Preconditions.checkState(!t.read(LogicalDatastoreType.OPERATIONAL, qid).get().isPresent(), "Conflicting instruction queue found");
 124         } catch (InterruptedException | ExecutionException e) {
 125             throw new IllegalStateException("Failed to acquire instruction queue", e);
 126         }
 127
 128         t.put(LogicalDatastoreType.OPERATIONAL, qid,
 129                 new InstructionsQueueBuilder().setInstruction(
 130                         Collections.<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.programming.rev130930.instruction.queue.Instruction> emptyList()).build());
 131         t.submit();
 132     }
 133
 134     @Override
 135     public ListenableFuture<RpcResult<CancelInstructionOutput>> cancelInstruction(final CancelInstructionInput input) {
 136         return this.executor.submit(new Callable<RpcResult<CancelInstructionOutput>>() {
 137             @Override
 138             public RpcResult<CancelInstructionOutput> call() {
 139                 return realCancelInstruction(input);
 140             }
 141         });
 142     }
 143
 144     @Override
 145     public ListenableFuture<RpcResult<CleanInstructionsOutput>> cleanInstructions(final CleanInstructionsInput input) {
 146         return this.executor.submit(new Callable<RpcResult<CleanInstructionsOutput>>() {
 147             @Override
 148             public RpcResult<CleanInstructionsOutput> call() {
 149                 return realCleanInstructions(input);
 150             }
 151         });
 152     }
 153
 154     private synchronized RpcResult<CancelInstructionOutput> realCancelInstruction(final CancelInstructionInput input) {
 155         final InstructionImpl i = this.insns.get(input.getId());
 156         if (i == null) {
 157             LOG.debug("Instruction {} not present in the graph", input.getId());
 158
 159             final CancelInstructionOutput out = new CancelInstructionOutputBuilder().setFailure(UnknownInstruction.class).build();
 160             return SuccessfulRpcResult.create(out);
 161         }
 162
 163         return SuccessfulRpcResult.create(new CancelInstructionOutputBuilder().setFailure(i.tryCancel(null)).build());
 164     }
 165
 166     private synchronized RpcResult<CleanInstructionsOutput> realCleanInstructions(final CleanInstructionsInput input) {
 167         final List<InstructionId> failed = new ArrayList<>();
 168
 169         for (final InstructionId id : input.getId()) {
 170             // Find the instruction
 171             final InstructionImpl i = this.insns.get(id);
 172             if (i == null) {
 173                 LOG.debug("Instruction {} not present in the graph", input.getId());
 174                 failed.add(id);
 175                 continue;
 176             }
 177
 178             // Check its status
 179             switch (i.getStatus()) {
 180             case Cancelled:
 181             case Failed:
 182             case Successful:
 183                 break;
 184             case Executing:
 185             case Queued:
 186             case Scheduled:
 187             case Unknown:
 188                 LOG.debug("Instruction {} cannot be cleaned because of it's in state {}", id, i.getStatus());
 189                 failed.add(id);
 190                 continue;
 191             }
 192
 193             // The instruction is in a terminal state, we need to just unlink
 194             // it from its dependencies and dependents
 195             i.clean();
 196
 197             this.insns.remove(id);
 198             LOG.debug("Instruction {} cleaned successfully", id);
 199         }
 200
 201         final CleanInstructionsOutputBuilder ob = new CleanInstructionsOutputBuilder();
 202         ob.setUnflushed(failed);
 203
 204         return SuccessfulRpcResult.create(ob.build());
 205     }
 206
 207     @Override
 208     public synchronized ListenableFuture<Instruction> scheduleInstruction(final SubmitInstructionInput input) throws SchedulerException {
 209         final InstructionId id = input.getId();
 210         if (this.insns.get(id) != null) {
 211             LOG.info("Instruction ID {} already present", id);
 212             throw new SchedulerException("Instruction ID currently in use", new FailureBuilder().setType(DuplicateInstructionId.class).build());
 213         }
 214
 215         // First things first: check the deadline
 216         final Nanotime now = NanotimeUtil.currentTime();
 217         final BigInteger left = input.getDeadline().getValue().subtract(now.getValue());
 218
 219         if (left.compareTo(BigInteger.ZERO) <= 0) {
 220             LOG.debug("Instruction {} deadline has already passed by {}ns", id, left);
 221             throw new SchedulerException("Instruction arrived after specified deadline", new FailureBuilder().setType(DeadOnArrival.class).build());
 222         }
 223
 224         // Resolve dependencies
 225         final List<InstructionImpl> dependencies = new ArrayList<>();
 226         for (final InstructionId pid : input.getPreconditions()) {
 227             final InstructionImpl i = this.insns.get(pid);
 228             if (i == null) {
 229                 LOG.info("Instruction {} depends on {}, which is not a known instruction", id, pid);
 230                 throw new SchedulerException("Unknown dependency ID specified", new FailureBuilder().setType(UnknownPreconditionId.class).build());
 231             }
 232
 233             dependencies.add(i);
 234         }
 235
 236         // Check if all dependencies are non-failed
 237         final List<InstructionId> unmet = new ArrayList<>();
 238         for (final InstructionImpl d : dependencies) {
 239             switch (d.getStatus()) {
 240             case Cancelled:
 241             case Failed:
 242             case Unknown:
 243                 unmet.add(d.getId());
 244                 break;
 245             case Executing:
 246             case Queued:
 247             case Scheduled:
 248             case Successful:
 249                 break;
 250             }
 251         }
 252
 253         /*
 254          *  Some dependencies have failed, declare the request dead-on-arrival
 255          *  and fail the operation.
 256          */
 257         if (!unmet.isEmpty()) {
 258             throw new SchedulerException("Instruction's dependencies are already unsuccessful", new FailureBuilder().setType(
 259                     DeadOnArrival.class).setFailedPreconditions(unmet).build());
 260         }
 261
 262         /*
 263          * All pre-flight checks done are at this point, the following
 264          * steps can only fail in catastrophic scenarios (OOM and the
 265          * like).
 266          */
 267
 268         // Schedule a timeout for the instruction
 269         final Timeout t = this.timer.newTimeout(new TimerTask() {
 270             @Override
 271             public void run(final Timeout timeout) {
 272                 timeoutInstruction(input.getId());
 273             }
 274         }, left.longValue(), TimeUnit.NANOSECONDS);
 275
 276         // Put it into the instruction list
 277         final SettableFuture<Instruction> ret = SettableFuture.create();
 278         final InstructionImpl i = new InstructionImpl(new InstructionPusher(id, input.getDeadline()), ret, id, dependencies, t);
 279         this.insns.put(id, i);
 280
 281         // Attach it into its dependencies
 282         for (final InstructionImpl d : dependencies) {
 283             d.addDependant(i);
 284         }
 285
 286         /*
 287          * All done. The next part is checking whether the instruction can
 288          * run, which we can figure out after sending out the acknowledgement.
 289          * This task should be ingress-weighed, so we reinsert it into the
 290          * same execution service.
 291          */
 292         this.executor.submit(new Runnable() {
 293             @Override
 294             public void run() {
 295                 tryScheduleInstruction(i);
 296             }
 297         });
 298
 299         return ret;
 300     }
 301
 302     private synchronized void timeoutInstruction(final InstructionId id) {
 303         final InstructionImpl i = this.insns.get(id);
 304         if (i == null) {
 305             LOG.warn("Instruction {} timed out, but not found in the queue", id);
 306             return;
 307         }
 308
 309         i.timeout();
 310     }
 311
 312     private synchronized void tryScheduleDependants(final InstructionImpl i) {
 313         // Walk all dependants and try to schedule them
 314         final Iterator<InstructionImpl> it = i.getDependants();
 315         while (it.hasNext()) {
 316             tryScheduleInstruction(it.next());
 317         }
 318     }
 319
 320     private synchronized void tryScheduleInstruction(final InstructionImpl i) {
 321         final ListenableFuture<ExecutionResult<Details>> f = i.ready();
 322         if (f != null) {
 323             Futures.addCallback(f, new FutureCallback<ExecutionResult<Details>>() {
 324                 @Override
 325                 public void onSuccess(final ExecutionResult<Details> result) {
 326                     tryScheduleDependants(i);
 327                 }
 328
 329                 @Override
 330                 public void onFailure(final Throwable t) {
 331                     LOG.error("Instruction {} failed to execute", i.getId(), t);
 332                 }
 333             });
 334         }
 335
 336     }
 337
 338     @Override
 339     public synchronized void close() {
 340         try {
 341             for (InstructionImpl i : insns.values()) {
 342                 i.tryCancel(null);
 343             }
 344         } finally {
 345             final WriteTransaction t = dataProvider.newWriteOnlyTransaction();
 346             t.delete(LogicalDatastoreType.OPERATIONAL, qid);
 347             t.submit();
 348         }
 349     }
 350 }