openflowplugin-impl/src/main/java/org/opendaylight/openflowplugin/impl/services/AbstractService.java

   1 /**
   2  * Copyright (c) 2015 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.openflowplugin.impl.services;
   9
  10 import com.google.common.base.Preconditions;
  11 import com.google.common.base.Verify;
  12 import com.google.common.util.concurrent.FutureCallback;
  13 import com.google.common.util.concurrent.Futures;
  14 import com.google.common.util.concurrent.ListenableFuture;
  15 import java.math.BigInteger;
  16 import javax.annotation.Nonnull;
  17 import org.opendaylight.openflowjava.protocol.api.connection.ConnectionAdapter;
  18 import org.opendaylight.openflowjava.protocol.api.connection.OutboundQueue;
  19 import org.opendaylight.openflowplugin.api.openflow.device.DeviceContext;
  20 import org.opendaylight.openflowplugin.api.openflow.device.RequestContext;
  21 import org.opendaylight.openflowplugin.api.openflow.device.RequestContextStack;
  22 import org.opendaylight.openflowplugin.api.openflow.device.Xid;
  23 import org.opendaylight.openflowplugin.api.openflow.statistics.ofpspecific.EventIdentifier;
  24 import org.opendaylight.openflowplugin.api.openflow.statistics.ofpspecific.MessageSpy;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.FeaturesReply;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.OfHeader;
  27 import org.opendaylight.yangtools.yang.binding.DataContainer;
  28 import org.opendaylight.yangtools.yang.common.RpcError;
  29 import org.opendaylight.yangtools.yang.common.RpcResult;
  30 import org.opendaylight.yangtools.yang.common.RpcResultBuilder;
  31 import org.slf4j.Logger;
  32 import org.slf4j.LoggerFactory;
  33
  34 abstract class AbstractService<I, O> {
  35     private static final Logger LOG = LoggerFactory.getLogger(AbstractService.class);
  36     private static final long WAIT_TIME = 2000;
  37     private static final BigInteger PRIMARY_CONNECTION = BigInteger.ZERO;
  38
  39     private final short version;
  40     private final BigInteger datapathId;
  41     private final RequestContextStack requestContextStack;
  42     private final DeviceContext deviceContext;
  43     private final ConnectionAdapter primaryConnectionAdapter;
  44     private final MessageSpy messageSpy;
  45     private EventIdentifier eventIdentifier;
  46
  47     public AbstractService(final RequestContextStack requestContextStack, final DeviceContext deviceContext) {
  48         this.requestContextStack = requestContextStack;
  49         this.deviceContext = deviceContext;
  50         final FeaturesReply features = this.deviceContext.getPrimaryConnectionContext().getFeatures();
  51         this.datapathId = features.getDatapathId();
  52         this.version = features.getVersion();
  53         this.primaryConnectionAdapter = deviceContext.getPrimaryConnectionContext().getConnectionAdapter();
  54         this.messageSpy = deviceContext.getMessageSpy();
  55     }
  56
  57     public EventIdentifier getEventIdentifier() {
  58         return eventIdentifier;
  59     }
  60
  61     public void setEventIdentifier(final EventIdentifier eventIdentifier) {
  62         this.eventIdentifier = eventIdentifier;
  63     }
  64
  65     public short getVersion() {
  66         return version;
  67     }
  68
  69     public BigInteger getDatapathId() {
  70         return datapathId;
  71     }
  72
  73     public RequestContextStack getRequestContextStack() {
  74         return requestContextStack;
  75     }
  76
  77     public DeviceContext getDeviceContext() {
  78         return deviceContext;
  79     }
  80
  81     public MessageSpy getMessageSpy() {
  82         return messageSpy;
  83     }
  84
  85     protected abstract OfHeader buildRequest(Xid xid, I input) throws Exception;
  86
  87     protected abstract FutureCallback<OfHeader> createCallback(RequestContext<O> context, Class<?> requestType);
  88
  89     public final ListenableFuture<RpcResult<O>> handleServiceCall(@Nonnull final I input) {
  90         Preconditions.checkNotNull(input);
  91
  92         final Class<?> requestType;
  93         if (input instanceof DataContainer) {
  94             requestType = ((DataContainer) input).getImplementedInterface();
  95         } else {
  96             requestType = input.getClass();
  97         }
  98         getMessageSpy().spyMessage(requestType, MessageSpy.STATISTIC_GROUP.TO_SWITCH_ENTERED);
  99
 100         LOG.trace("Handling general service call");
 101         final RequestContext<O> requestContext = requestContextStack.createRequestContext();
 102         if (requestContext == null) {
 103             LOG.trace("Request context refused.");
 104             deviceContext.getMessageSpy().spyMessage(AbstractService.class, MessageSpy.STATISTIC_GROUP.TO_SWITCH_DISREGARDED);
 105             return failedFuture();
 106         }
 107
 108         if (requestContext.getXid() == null) {
 109             deviceContext.getMessageSpy().spyMessage(requestContext.getClass(), MessageSpy.STATISTIC_GROUP.TO_SWITCH_RESERVATION_REJECTED);
 110             return RequestContextUtil.closeRequestContextWithRpcError(requestContext, "Outbound queue wasn't able to reserve XID.");
 111         }
 112
 113         messageSpy.spyMessage(requestContext.getClass(), MessageSpy.STATISTIC_GROUP.TO_SWITCH_READY_FOR_SUBMIT);
 114
 115         final Xid xid = requestContext.getXid();
 116         OfHeader request = null;
 117         try {
 118             request = buildRequest(xid, input);
 119             Verify.verify(xid.getValue().equals(request.getXid()), "Expected XID %s got %s", xid.getValue(), request.getXid());
 120         } catch (Exception e) {
 121             LOG.error("Failed to build request for {}, forfeiting request {}", input, xid.getValue(), e);
 122             RequestContextUtil.closeRequestContextWithRpcError(requestContext, "failed to build request input: " + e.getMessage());
 123         } finally {
 124             final OutboundQueue outboundQueue = getDeviceContext().getPrimaryConnectionContext().getOutboundQueueProvider();
 125             outboundQueue.commitEntry(xid.getValue(), request, createCallback(requestContext, requestType));
 126         }
 127
 128         return requestContext.getFuture();
 129     }
 130
 131     protected static <T> ListenableFuture<RpcResult<T>> failedFuture() {
 132         final RpcResult<T> rpcResult = RpcResultBuilder.<T>failed()
 133                 .withError(RpcError.ErrorType.APPLICATION, "", "Request quota exceeded").build();
 134         return Futures.immediateFuture(rpcResult);
 135     }
 136 }