2 * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
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
9 package org.opendaylight.openflowplugin.api.openflow.device;
11 import java.math.BigInteger;
13 import java.util.concurrent.Future;
14 import org.opendaylight.controller.md.sal.binding.api.ReadTransaction;
15 import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
16 import org.opendaylight.openflowplugin.api.openflow.connection.ConnectionContext;
17 import org.opendaylight.openflowplugin.api.openflow.device.exception.DeviceDataException;
18 import org.opendaylight.openflowplugin.api.openflow.device.handlers.MessageHandler;
19 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.OfHeader;
20 import org.opendaylight.yang.gen.v1.urn.opendaylight.table.types.rev131026.TableFeatures;
21 import org.opendaylight.yangtools.yang.binding.DataObject;
22 import org.opendaylight.yangtools.yang.common.RpcResult;
24 import com.google.common.util.concurrent.SettableFuture;
26 import java.util.Collection;
27 import java.util.List;
29 import java.util.concurrent.Future;
32 * The central entity of OFP is the Device Context, which encapsulate the logical state of a switch
33 * as seen by the controller. Each OpenFlow session is tracked by a Connection Context.
34 * These attach to a particular Device Context in such a way, that there is at most one primary
35 * session associated with a Device Context. Whenever the controller needs to interact with a
36 * particular switch, it will do so in the context of the calling thread, obtaining a lock on
37 * the corresponding Device Context – thus the Device Context becomes the fine-grained point
38 * of synchronization. The only two entities allowed to send requests towards the switch are
39 * Statistics Manager and RPC Manager. Each of them allocates a Request Context for interacting
40 * with a particular Device Context. The Request Contexts are the basic units of fairness,
41 * which is enforced by keeping a cap on the number of outstanding requests a particular Request
42 * Context can have at any point in time. Should this quota be exceeded, any further attempt to make
43 * a request to the switch will fail immediately, with proper error indication.
45 * Created by Martin Bobak <mbobak@cisco.com> on 25.2.2015.
47 public interface DeviceContext extends MessageHandler {
51 * Method add auxiliary connection contexts to this context representing single device connection.
53 * @param connectionContext
55 void addAuxiliaryConenctionContext(ConnectionContext connectionContext);
58 * Method removes auxiliary connection context from this context representing single device connection.
60 * @param connectionContext
62 void removeAuxiliaryConenctionContext(ConnectionContext connectionContext);
66 * Method provides state of device represented by this device context.
68 * @return {@link DeviceState}
70 DeviceState getDeviceState();
73 * Method exposes transaction created for device
74 * represented by this context. This should be used as write only.
76 WriteTransaction getWriteTransaction();
79 * Method exposes transaction created for device
80 * represented by this context. This should be used as read only.
81 * This read only transaction has a fresh dataStore snapshot and
82 * here is a possibility to get different data set from DataStore
83 * as have a write transaction in this context.
85 ReadTransaction getReadTransaction();
88 * Method provides capabilities of connected device.
92 TableFeatures getCapabilities();
95 * Method provides current devices connection context.
99 ConnectionContext getPrimaryConnectionContext();
102 * Method provides current devices auxiliary connection contexts.
106 ConnectionContext getAuxiliaryConnectiobContexts(BigInteger cookie);
111 * Method writes request context into request context map
113 * @param requestFutureContext
115 public void hookRequestCtx(Xid xid, RequestContext requestFutureContext);