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.OutboundQueue;
  18 import org.opendaylight.openflowplugin.api.openflow.device.DeviceContext;
  19 import org.opendaylight.openflowplugin.api.openflow.device.DeviceInfo;
  20 import org.opendaylight.openflowplugin.api.openflow.device.DeviceRegistry;
  21 import org.opendaylight.openflowplugin.api.openflow.device.RequestContext;
  22 import org.opendaylight.openflowplugin.api.openflow.device.RequestContextStack;
  23 import org.opendaylight.openflowplugin.api.openflow.device.TxFacade;
  24 import org.opendaylight.openflowplugin.api.openflow.device.Xid;
  25 import org.opendaylight.openflowplugin.api.openflow.statistics.ofpspecific.EventIdentifier;
  26 import org.opendaylight.openflowplugin.api.openflow.statistics.ofpspecific.MessageSpy;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.OfHeader;
  28 import org.opendaylight.yangtools.yang.binding.DataContainer;
  29 import org.opendaylight.yangtools.yang.common.RpcError;
  30 import org.opendaylight.yangtools.yang.common.RpcResult;
  31 import org.opendaylight.yangtools.yang.common.RpcResultBuilder;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 abstract class AbstractService<I, O> {
  36     private static final Logger LOG = LoggerFactory.getLogger(AbstractService.class);
  37
  38     private final short version;
  39     private final BigInteger datapathId;
  40     private final RequestContextStack requestContextStack;
  41     private final DeviceContext deviceContext;
  42     private final MessageSpy messageSpy;
  43     private EventIdentifier eventIdentifier;
  44
  45     AbstractService(final RequestContextStack requestContextStack, final DeviceContext deviceContext) {
  46         final DeviceInfo deviceInfo = deviceContext.getDeviceInfo();
  47
  48         this.requestContextStack = requestContextStack;
  49         this.deviceContext = deviceContext;
  50         this.datapathId = deviceInfo.getDatapathId();
  51         this.version = deviceInfo.getVersion();
  52         this.messageSpy = deviceContext.getMessageSpy();
  53     }
  54
  55     public EventIdentifier getEventIdentifier() {
  56         return eventIdentifier;
  57     }
  58
  59     public void setEventIdentifier(final EventIdentifier eventIdentifier) {
  60         this.eventIdentifier = eventIdentifier;
  61     }
  62
  63     public short getVersion() {
  64         return version;
  65     }
  66
  67     public BigInteger getDatapathId() {
  68         return datapathId;
  69     }
  70
  71     public RequestContextStack getRequestContextStack() {
  72         return requestContextStack;
  73     }
  74
  75     @Deprecated
  76     public DeviceContext getDeviceContext() {
  77         return deviceContext;
  78     }
  79
  80     protected DeviceRegistry getDeviceRegistry() {return deviceContext;}
  81
  82     public DeviceInfo getDeviceInfo() {return deviceContext.getDeviceInfo();}
  83
  84     public TxFacade getTxFacade() {return deviceContext;}
  85
  86     public MessageSpy getMessageSpy() {
  87         return messageSpy;
  88     }
  89
  90     protected abstract OfHeader buildRequest(Xid xid, I input) throws ServiceException;
  91
  92     protected abstract FutureCallback<OfHeader> createCallback(RequestContext<O> context, Class<?> requestType);
  93
  94     public final ListenableFuture<RpcResult<O>> handleServiceCall(@Nonnull final I input) {
  95         Preconditions.checkNotNull(input);
  96
  97         final Class<?> requestType;
  98         if (input instanceof DataContainer) {
  99             requestType = ((DataContainer) input).getImplementedInterface();
 100         } else {
 101             requestType = input.getClass();
 102         }
 103         getMessageSpy().spyMessage(requestType, MessageSpy.STATISTIC_GROUP.TO_SWITCH_ENTERED);
 104
 105         LOG.trace("Handling general service call");
 106         final RequestContext<O> requestContext = requestContextStack.createRequestContext();
 107         if (requestContext == null) {
 108             LOG.trace("Request context refused.");
 109             getMessageSpy().spyMessage(AbstractService.class, MessageSpy.STATISTIC_GROUP.TO_SWITCH_DISREGARDED);
 110             return failedFuture();
 111         }
 112
 113         if (requestContext.getXid() == null) {
 114             getMessageSpy().spyMessage(requestContext.getClass(), MessageSpy.STATISTIC_GROUP.TO_SWITCH_RESERVATION_REJECTED);
 115             return RequestContextUtil.closeRequestContextWithRpcError(requestContext, "Outbound queue wasn't able to reserve XID.");
 116         }
 117
 118         getMessageSpy().spyMessage(requestContext.getClass(), MessageSpy.STATISTIC_GROUP.TO_SWITCH_READY_FOR_SUBMIT);
 119
 120         final Xid xid = requestContext.getXid();
 121         OfHeader request = null;
 122         try {
 123             request = buildRequest(xid, input);
 124             Verify.verify(xid.getValue().equals(request.getXid()), "Expected XID %s got %s", xid.getValue(), request.getXid());
 125         } catch (Exception e) {
 126             LOG.error("Failed to build request for {}, forfeiting request {}", input, xid.getValue(), e);
 127             RequestContextUtil.closeRequestContextWithRpcError(requestContext, "failed to build request input: " + e.getMessage());
 128         } finally {
 129             final OutboundQueue outboundQueue = getDeviceContext().getPrimaryConnectionContext().getOutboundQueueProvider();
 130             outboundQueue.commitEntry(xid.getValue(), request, createCallback(requestContext, requestType));
 131         }
 132
 133         return requestContext.getFuture();
 134     }
 135
 136     protected static <T> ListenableFuture<RpcResult<T>> failedFuture() {
 137         final RpcResult<T> rpcResult = RpcResultBuilder.<T>failed()
 138                 .withError(RpcError.ErrorType.APPLICATION, "", "Request quota exceeded").build();
 139         return Futures.immediateFuture(rpcResult);
 140     }
 141 }