2 * Copyright 2011 Google Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.ipc.invalidation.external.client;
19 import com.google.ipc.invalidation.external.client.SystemResources.Logger;
20 import com.google.ipc.invalidation.external.client.SystemResources.NetworkChannel;
21 import com.google.ipc.invalidation.external.client.SystemResources.Scheduler;
22 import com.google.ipc.invalidation.external.client.SystemResources.Storage;
23 import com.google.ipc.invalidation.ticl.BasicSystemResources;
24 import com.google.ipc.invalidation.util.Preconditions;
28 * A builder to override some or all resource components in {@code SystemResources} . See
29 * discussion in {@code ResourceComponent} as well.
33 // The resources used for constructing the SystemResources in builder.
34 public class SystemResourcesBuilder {
35 private Scheduler internalScheduler;
36 private Scheduler listenerScheduler;
37 private Logger logger;
38 private NetworkChannel network;
39 private Storage storage;
40 private String platform;
42 /** If the build method has been called on this builder. */
43 private boolean sealed;
45 /** See specs at {@code DefaultResourcesFactory.createDefaultResourcesBuilder}. */
46 public SystemResourcesBuilder(Logger logger, Scheduler internalScheduler,
47 Scheduler listenerScheduler, NetworkChannel network, Storage storage) {
49 this.internalScheduler = internalScheduler;
50 this.listenerScheduler = listenerScheduler;
51 this.network = network;
52 this.storage = storage;
55 /** Returns a new builder that shares all the resources of {@code builder} but is not sealed. */
56 public SystemResourcesBuilder(SystemResourcesBuilder builder) {
57 this.logger = builder.logger;
58 this.internalScheduler = builder.internalScheduler;
59 this.listenerScheduler = builder.listenerScheduler;
60 this.network = builder.network;
61 this.storage = builder.storage;
65 /** Returns the internal scheduler. */
66 public Scheduler getInternalScheduler() {
67 return internalScheduler;
70 /** Returns the listener scheduler. */
71 public Scheduler getListenerScheduler() {
72 return listenerScheduler;
75 /** Returns the network channel. */
76 public NetworkChannel getNetwork() {
80 /** Returns the logger. */
81 public Logger getLogger() {
85 /** Returns the storage. */
86 public Storage getStorage() {
91 * Sets the scheduler for scheduling internal events to be {@code internalScheduler}.
93 * REQUIRES: {@link #build} has not been called.
95 public SystemResourcesBuilder setInternalScheduler(Scheduler internalScheduler) {
96 Preconditions.checkState(!sealed, "Builder's build method has already been called");
97 this.internalScheduler = internalScheduler;
102 * Sets the scheduler for scheduling listener events to be {@code listenerScheduler}.
104 * REQUIRES: {@link #build} has not been called.
106 public SystemResourcesBuilder setListenerScheduler(Scheduler listenerScheduler) {
107 Preconditions.checkState(!sealed, "Builder's build method has already been called");
108 this.listenerScheduler = listenerScheduler;
113 * Sets the logger to be {@code logger}.
115 * REQUIRES: {@link #build} has not been called.
117 public SystemResourcesBuilder setLogger(Logger logger) {
118 Preconditions.checkState(!sealed, "Builder's build method has already been called");
119 this.logger = logger;
124 * Sets the network channel for communicating with the server to be {@code network}.
126 * REQUIRES: {@link #build} has not been called.
128 public SystemResourcesBuilder setNetwork(NetworkChannel network) {
129 Preconditions.checkState(!sealed, "Builder's build method has already been called");
130 this.network = network;
135 * Sets the persistence layer to be {@code storage}.
137 * REQUIRES: {@link #build} has not been called.
139 public SystemResourcesBuilder setStorage(Storage storage) {
140 Preconditions.checkState(!sealed, "Builder's build method has already been called");
141 this.storage = storage;
146 * Sets the platform to be {@code platform}.
148 * REQUIRES: {@link #build} has not been called.
150 public SystemResourcesBuilder setPlatform(String platform) {
151 Preconditions.checkState(!sealed, "Builder's build method has already been called");
152 this.platform = platform;
157 * Builds the {@code SystemResources} object with the given resource components and returns it.
159 * Caller must not call any mutation method (on this SystemResourcesBuilder) after
160 * {@code build} has been called (i.e., build and the set* methods)
162 public SystemResources build() {
163 Preconditions.checkState(!sealed, "Builder's build method has already been called");
165 return new BasicSystemResources(logger, internalScheduler, listenerScheduler, network, storage,
169 /** Seals the builder so that no mutation method can be called on this. */
170 protected void seal() {
171 Preconditions.checkState(!sealed, "Builder's already sealed");